DTE ELECTRIC CO, 10-Q filed on 7/27/2021
Quarterly Report
v3.21.2
Document and Entity Information
 6 Months Ended
Jun. 30, 2021
shares
Document Type 10-Q
Document Quarterly Report true
Document Period End Date Jun. 30, 2021
Document Transition Report false
Entity File Number 1-11607
Entity Registrant Name DTE Energy Co
Entity Incorporation, State or Country Code MI
Entity Tax Identification Number 38-3217752
Entity Address, Address Line One One Energy Plaza
Entity Address, City or Town Detroit
Entity Address, State or Province MI
Entity Address, Postal Zip Code 48226-1279
City Area Code 313
Local Phone Number 235-4000
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Small Business false
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 193,751,554
Entity Central Index Key 0000936340
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2021
Document Fiscal Period Focus Q2
Amendment Flag false
DTE Electric  
Entity File Number 1-2198
Entity Registrant Name DTE Electric Co
Entity Incorporation, State or Country Code MI
Entity Tax Identification Number 38-0478650
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Small Business false
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 138,632,324
Entity Central Index Key 0000028385
Common stock, without par value  
Title of 12(b) Security Common stock, without par value
Trading Symbol DTE
Security Exchange Name NYSE
2016 Series F 6.00% Junior Subordinated Debentures due 2076  
Title of 12(b) Security 2016 Series F 6.00% Junior Subordinated Debentures due 2076
Trading Symbol DTY
Security Exchange Name NYSE
2017 Series E 5.25% Junior Subordinated Debentures due 2077  
Title of 12(b) Security 2017 Series E 5.25% Junior Subordinated Debentures due 2077
Trading Symbol DTW
Security Exchange Name NYSE
2019 6.25% Corporate Units  
Title of 12(b) Security 2019 6.25% Corporate Units
Trading Symbol DTP
Security Exchange Name NYSE
2020 Series G 4.375% Junior Subordinated Debentures due 2080  
Title of 12(b) Security 2020 Series G 4.375% Junior Subordinated Debentures due 2080
Trading Symbol DTB
Security Exchange Name NYSE
v3.21.2
Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating Revenues        
Utility operations $ 1,655 $ 1,542 $ 3,608 $ 3,275
Non-utility operations 1,574 1,041 3,399 2,330
Operating Revenues 3,229 2,583 7,007 5,605
Operating Expenses        
Fuel, purchased power, and gas — utility 390 374 934 841
Fuel, purchased power, gas, and other — non-utility 1,357 789 2,957 1,757
Operation and maintenance 621 564 1,229 1,143
Depreciation and amortization 380 350 748 703
Taxes other than income 114 84 236 203
Asset (gains) losses and impairments, net 45 55 44 45
Operating Expenses 2,907 2,216 6,148 4,692
Operating Income 322 367 859 913
Other (Income) and Deductions        
Interest expense 190 179 371 354
Interest income (7) (6) (14) (16)
Non-operating retirement benefits, net 3 6 7 15
Other income (83) (101) (159) (166)
Other expenses 18 6 28 52
Other (Income) and Deductions 121 84 233 239
Income Before Income Taxes 201 283 626 674
Income Tax Expense 22 6 50 55
Net Income 179 277 576 619
Less: Net Income Attributable to Noncontrolling Interests 0 0 0 2
Net Income Attributable to DTE Energy Company/DTE Electric Company $ 179 $ 277 $ 576 $ 617
Basic Earnings per Common Share        
Net Income Attributable to DTE Energy Company (in dollars per share) $ 0.92 $ 1.44 $ 2.97 $ 3.20
Diluted Earnings per Common Share        
Net Income Attributable to DTE Energy Company (in dollars per share) $ 0.92 $ 1.44 $ 2.97 $ 3.20
Weighted Average Common Shares Outstanding        
Basic (in shares) 193 192 193 192
Diluted (in shares) 194 193 194 192
DTE Electric        
Operating Revenues        
Utility operations $ 1,408 $ 1,309 $ 2,768 $ 2,521
Operating Expenses        
Fuel, purchased power, and gas — utility 361 342 723 639
Operation and maintenance 355 353 712 713
Depreciation and amortization 272 252 532 510
Taxes other than income 80 58 162 141
Asset (gains) losses and impairments, net 0 41 0 41
Operating Expenses 1,068 1,046 2,129 2,044
Operating Income 340 263 639 477
Other (Income) and Deductions        
Interest expense 85 85 167 166
Interest income 0 0 0 (2)
Non-operating retirement benefits, net (1) 0 (1) 0
Other income (19) (37) (38) (50)
Other expenses 10 7 18 48
Other (Income) and Deductions 75 55 146 162
Income Before Income Taxes 265 208 493 315
Income Tax Expense 27 25 47 38
Net Income Attributable to DTE Energy Company/DTE Electric Company $ 238 $ 183 $ 446 $ 277
v3.21.2
Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net Income $ 179 $ 277 $ 576 $ 619
Net Income 179 277 576 617
Other comprehensive income, net of tax:        
Benefit obligations, net of taxes of $—, $1, $1, and $2, respectively 1 2 3 5
Net unrealized gains (losses) on derivatives, net of taxes of $1, for all periods 1 1 2 2
Foreign currency translation 0 1 0 0
Other comprehensive income 2 4 5 7
Comprehensive income 181 281 581 626
Less: Comprehensive income attributable to noncontrolling interests 0 0 0 2
Comprehensive Income Attributable to DTE Energy Company/DTE Electric Company 181 281 581 624
DTE Electric        
Net Income 238 183 446 277
Other comprehensive income, net of tax:        
Other comprehensive income 0 0 0 0
Comprehensive Income Attributable to DTE Energy Company/DTE Electric Company $ 238 $ 183 $ 446 $ 277
v3.21.2
Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement of Comprehensive Income [Abstract]        
Tax effect on benefit obligations $ 0 $ 1 $ 1 $ 2
Tax effect on net unrealized gains (losses) on derivatives during the period $ 1 $ 1 $ 1 $ 1
v3.21.2
Consolidated Statements of Financial Position (Unaudited) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Current Assets    
Cash and cash equivalents $ 3,448 $ 514
Restricted cash 2 2
Accounts receivable (less allowance for doubtful accounts)    
Customer 1,550 1,665
Other 157 127
Inventories    
Fuel and gas 297 335
Materials, supplies, and other 469 381
Derivative assets 171 116
Regulatory assets 127 129
Other 181 229
Total Current Assets 6,402 3,498
Investments    
Nuclear decommissioning trust funds 2,019 1,855
Investments in equity method investees 1,860 1,868
Other 191 196
Total Investments 4,070 3,919
Property    
Property, plant, and equipment 39,486 37,997
Accumulated depreciation and amortization (10,346) (10,028)
Property, plant, and equipment, net 29,140 27,969
Other Assets    
Goodwill 2,466 2,466
Regulatory assets 4,002 4,128
Intangible assets 2,296 2,339
Notes receivable 312 280
Derivative assets 50 40
Prepaid postretirement costs 602 561
Operating lease right-of-use assets 138 152
Other 158 144
Total Other Assets 10,024 10,110
Total Assets 49,636 45,496
Accounts payable    
Accounts payable 1,173 1,029
Accrued interest 168 158
Dividends payable 370 210
Short-term borrowings 69 38
Current portion long-term debt, including finance leases 1,047 469
Derivative liabilities 232 68
Gas inventory equalization 31 0
Regulatory liabilities 38 39
Short-term borrowings    
Operating lease liabilities 32 33
Other 577 647
Total Current Liabilities 3,737 2,691
Long-Term Debt (net of current portion)    
Mortgage bonds, notes, and other 20,987 17,802
Junior subordinated debentures 883 1,175
Finance lease liabilities 21 24
Total Long-Term Debt (net of current portion) 21,891 19,001
Other Liabilities    
Deferred income taxes 2,952 2,822
Regulatory liabilities 3,349 3,363
Asset retirement obligations 2,947 2,839
Unamortized investment tax credit 159 162
Derivative liabilities 164 60
Accrued pension liability 753 797
Accrued postretirement liability 396 407
Nuclear decommissioning 311 283
Operating lease liabilities 98 111
Other 340 371
Total Other Liabilities 11,469 11,215
Commitments and Contingencies (Notes 6 and 13)
Equity    
Common stock 5,361 5,406
Retained earnings 7,149 7,156
Accumulated other comprehensive loss (132) (137)
Total DTE Energy/DTE Electric Company Equity 12,378 12,425
Noncontrolling interests 161 164
Total Equity 12,539 12,589
Total Liabilities and Equity 49,636 45,496
DTE Electric    
Current Assets    
Cash and cash equivalents 11 16
Accounts receivable (less allowance for doubtful accounts)    
Customer 780 763
Affiliates 6 13
Other 82 62
Inventories    
Fuel and gas 174 187
Materials, supplies, and other 319 292
Regulatory assets 124 123
Other 76 71
Total Current Assets 1,572 1,527
Investments    
Nuclear decommissioning trust funds 2,019 1,855
Other 45 42
Total Investments 2,064 1,897
Property    
Property, plant, and equipment 27,462 26,171
Accumulated depreciation and amortization (7,324) (7,050)
Property, plant, and equipment, net 20,138 19,121
Other Assets    
Regulatory assets 3,347 3,440
Intangible assets 3 11
Prepaid postretirement costs — affiliates 359 335
Operating lease right-of-use assets 70 75
Other 120 107
Total Other Assets 3,899 3,968
Total Assets 27,673 26,513
Accounts payable    
Affiliates 59 62
Other 466 410
Accrued interest 96 91
Current portion long-term debt, including finance leases 436 468
Regulatory liabilities 30 18
Short-term borrowings    
Affiliates 194 101
Operating lease liabilities 11 11
Other 176 219
Total Current Liabilities 1,468 1,380
Long-Term Debt (net of current portion)    
Mortgage bonds, notes, and other 8,514 7,774
Finance lease liabilities 10 13
Total Long-Term Debt (net of current portion) 8,524 7,787
Other Liabilities    
Deferred income taxes 2,602 2,525
Regulatory liabilities 2,441 2,432
Asset retirement obligations 2,710 2,607
Unamortized investment tax credit 159 162
Nuclear decommissioning 311 283
Accrued pension liability — affiliates 708 731
Accrued postretirement liability — affiliates 375 384
Operating lease liabilities 51 56
Other 101 96
Total Other Liabilities 9,458 9,276
Commitments and Contingencies (Notes 6 and 13)
Equity    
Common stock 5,447 5,447
Retained earnings 2,776 2,623
Total DTE Energy/DTE Electric Company Equity 8,223 8,070
Total Liabilities and Equity $ 27,673 $ 26,513
v3.21.2
Consolidated Statements of Financial Position (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Current Assets    
Allowance for doubtful accounts $ 115 $ 104
Shareholder’s Equity    
Common stock, shares authorized (in shares) 400,000,000 400,000,000
Common stock, shares issued (in shares) 193,751,554 193,770,617
Common stock, shares outstanding (in shares) 193,751,554 193,770,617
DTE Electric    
Current Assets    
Allowance for doubtful accounts $ 56 $ 57
Shareholder’s Equity    
Par value (in dollars per share) $ 10 $ 10
Common stock, shares authorized (in shares) 400,000,000 400,000,000
Common stock, shares issued (in shares) 138,632,324 138,632,324
Common stock, shares outstanding (in shares) 138,632,324 138,632,324
v3.21.2
Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating Activities    
Net Income $ 576 $ 619
Net Income 576 617
Adjustments to reconcile Net Income to Net cash from operating activities:    
Depreciation and amortization 748 703
Nuclear fuel amortization 29 13
Allowance for equity funds used during construction (13) (13)
Deferred income taxes 68 286
Equity earnings of equity method investees (73) (59)
Dividends from equity method investees 73 81
Asset (gains) losses and impairments, net 47 49
Changes in assets and liabilities:    
Accounts receivable, net 85 156
Inventories (53) (24)
Prepaid postretirement benefit costs (41) (44)
Accounts payable 112 (78)
Gas inventory equalization 31 29
Accrued pension liability (44) (29)
Accrued postretirement liability (11) 0
Derivative assets and liabilities 203 (58)
Regulatory assets and liabilities 265 (67)
Other current and noncurrent assets and liabilities (86) 117
Net cash from operating activities 1,916 1,681
Investing Activities    
Plant and equipment expenditures — utility (1,788) (1,599)
Plant and equipment expenditures — non-utility (86) (424)
Acquisitions related to business combinations, net of cash acquired 0 (126)
Proceeds from sale of assets 2 4
Proceeds from sale of nuclear decommissioning trust fund assets 637 1,238
Investment in nuclear decommissioning trust funds (640) (1,238)
Distributions from equity method investees 11 6
Contributions to equity method investees (6) (17)
Notes receivable (51) (24)
Other (7) (5)
Net cash used for investing activities (1,928) (2,185)
Financing Activities    
Issuance of long-term debt, net of discount and issuance costs 4,035 1,685
Redemption of long-term debt (583) (300)
Short-term borrowings, net 31 86
Repurchase of common stock (54) 0
Dividends paid on common stock (420) (390)
Contributions from noncontrolling interests, principally REF entities 22 15
Distributions to noncontrolling interests (26) (13)
Other (59) (51)
Net cash from financing activities 2,946 1,032
Net Increase (Decrease) in Cash and Cash Equivalents 2,934 528
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period 516 93
Cash, Cash Equivalents, and Restricted Cash at End of Period 3,450 621
Supplemental disclosure of non-cash investing and financing activities    
Plant and equipment expenditures in accounts payable 295 340
DTE Electric    
Operating Activities    
Net Income 446 277
Adjustments to reconcile Net Income to Net cash from operating activities:    
Depreciation and amortization 532 510
Nuclear fuel amortization 29 13
Allowance for equity funds used during construction (12) (12)
Deferred income taxes 36 26
Asset (gains) losses and impairments, net 0 41
Changes in assets and liabilities:    
Accounts receivable, net (30) (62)
Inventories (17) (32)
Accounts payable 25 42
Prepaid postretirement benefit costs — affiliates (24) 0
Accrued pension liability — affiliates (23) (13)
Accrued postretirement liability — affiliates (9) (29)
Regulatory assets and liabilities 235 (91)
Other current and noncurrent assets and liabilities (159) 87
Net cash from operating activities 1,029 757
Investing Activities    
Plant and equipment expenditures (1,512) (1,381)
Proceeds from sale of nuclear decommissioning trust fund assets 637 1,238
Investment in nuclear decommissioning trust funds (640) (1,238)
Other (6) (4)
Net cash used for investing activities (1,521) (1,387)
Financing Activities    
Issuance of long-term debt, net of discount and issuance costs 987 1,685
Redemption of long-term debt (283) (300)
Short-term borrowings, net — affiliate 93 10
Short-term borrowings, net — other 0 (154)
Dividends paid on common stock (293) (269)
Other (17) (18)
Net cash from financing activities 487 954
Net Increase (Decrease) in Cash and Cash Equivalents (5) 324
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period 16 12
Cash, Cash Equivalents, and Restricted Cash at End of Period 11 336
Supplemental disclosure of non-cash investing and financing activities    
Plant and equipment expenditures in accounts payable $ 201 $ 170
v3.21.2
Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
$ in Millions
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interests
DTE Electric
DTE Electric
Common Stock
DTE Electric
Additional Paid-in Capital
DTE Electric
Retained Earnings
Beginning Balance (in shares) at Dec. 31, 2019   192,209,000         138,632,000    
Beginning Balance at Dec. 31, 2019 $ 11,836 $ 5,233 $ 6,587 $ (148) $ 164        
Beginning Balance at Dec. 31, 2019           $ 7,195 $ 1,386 $ 3,425 $ 2,384
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net Income 342   340   2        
Net Income           94     94
Dividends declared on common stock (195)   (195)     (135)     (135)
Other comprehensive income (loss), net of tax 3     3          
Stock-based compensation, net distributions to noncontrolling interests, and other (in shares)   403,000              
Stock-based compensation, net distributions to noncontrolling interests, and other 2 $ 2              
Ending Balance (in shares) at Mar. 31, 2020   192,612,000         138,632,000    
Ending Balance at Mar. 31, 2020 11,988 $ 5,235 6,732 (145) 166        
Ending Balance at Mar. 31, 2020           7,154 $ 1,386 3,425 2,343
Beginning Balance (in shares) at Dec. 31, 2019   192,209,000         138,632,000    
Beginning Balance at Dec. 31, 2019 11,836 $ 5,233 6,587 (148) 164        
Beginning Balance at Dec. 31, 2019           7,195 $ 1,386 3,425 2,384
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net Income 619                
Net Income 617         277      
Other comprehensive income (loss), net of tax 7         0      
Ending Balance (in shares) at Jun. 30, 2020   192,651,000         138,632,000    
Ending Balance at Jun. 30, 2020 11,892 $ 5,247 6,618 (141) 168        
Ending Balance at Jun. 30, 2020           7,203 $ 1,386 3,425 2,392
Beginning Balance (in shares) at Mar. 31, 2020   192,612,000         138,632,000    
Beginning Balance at Mar. 31, 2020 11,988 $ 5,235 6,732 (145) 166        
Beginning Balance at Mar. 31, 2020           7,154 $ 1,386 3,425 2,343
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net Income 277   277   0        
Net Income 277         183     183
Dividends declared on common stock (390)   (390)     (134)     (134)
Other comprehensive income (loss), net of tax 4     4   0      
Stock-based compensation, net distributions to noncontrolling interests, and other (in shares)   39,000              
Stock-based compensation, net distributions to noncontrolling interests, and other 13 $ 12 (1)   2        
Ending Balance (in shares) at Jun. 30, 2020   192,651,000         138,632,000    
Ending Balance at Jun. 30, 2020 $ 11,892 $ 5,247 6,618 (141) 168        
Ending Balance at Jun. 30, 2020           $ 7,203 $ 1,386 3,425 2,392
Beginning Balance (in shares) at Dec. 31, 2020 193,770,617 193,771,000       138,632,324 138,632,000    
Beginning Balance at Dec. 31, 2020 $ 12,589 $ 5,406 7,156 (137) 164        
Beginning Balance at Dec. 31, 2020 12,425         $ 8,070 $ 1,386 4,061 2,623
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net Income 397   397            
Net Income           208     208
Dividends declared on common stock (210)   (210)     (147)     (147)
Repurchase of common stock (in shares)   (430,000)              
Repurchase of common stock (54) $ (54)              
Other comprehensive income (loss), net of tax 3     3          
Stock-based compensation, net distributions to noncontrolling interests, and other (in shares)   386,000              
Stock-based compensation, net distributions to noncontrolling interests, and other (11) $ (8) (1)   (2)        
Ending Balance (in shares) at Mar. 31, 2021   193,727,000         138,632,000    
Ending Balance at Mar. 31, 2021 $ 12,714 $ 5,344 7,342 (134) 162        
Ending Balance at Mar. 31, 2021           $ 8,131 $ 1,386 4,061 2,684
Beginning Balance (in shares) at Dec. 31, 2020 193,770,617 193,771,000       138,632,324 138,632,000    
Beginning Balance at Dec. 31, 2020 $ 12,589 $ 5,406 7,156 (137) 164        
Beginning Balance at Dec. 31, 2020 12,425         $ 8,070 $ 1,386 4,061 2,623
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net Income 576                
Net Income 576         446      
Other comprehensive income (loss), net of tax $ 5         $ 0      
Ending Balance (in shares) at Jun. 30, 2021 193,751,554 193,752,000       138,632,324 138,632,000    
Ending Balance at Jun. 30, 2021 $ 12,539 $ 5,361 7,149 (132) 161        
Ending Balance at Jun. 30, 2021 12,378         $ 8,223 $ 1,386 4,061 2,776
Beginning Balance (in shares) at Mar. 31, 2021   193,727,000         138,632,000    
Beginning Balance at Mar. 31, 2021 12,714 $ 5,344 7,342 (134) 162        
Beginning Balance at Mar. 31, 2021           8,131 $ 1,386 4,061 2,684
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net Income 179   179            
Net Income 179         238     238
Dividends declared on common stock (370)   (370)     (146)     (146)
Other comprehensive income (loss), net of tax 2     2   $ 0      
Stock-based compensation, net distributions to noncontrolling interests, and other (in shares)   25,000              
Stock-based compensation, net distributions to noncontrolling interests, and other $ 14 $ 17 (2)   (1)        
Ending Balance (in shares) at Jun. 30, 2021 193,751,554 193,752,000       138,632,324 138,632,000    
Ending Balance at Jun. 30, 2021 $ 12,539 $ 5,361 $ 7,149 $ (132) $ 161        
Ending Balance at Jun. 30, 2021 $ 12,378         $ 8,223 $ 1,386 $ 4,061 $ 2,776
v3.21.2
Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares
 3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]        
Dividends declared on common stock (in dollars per share) $ 1.91 $ 1.09 $ 2.03 $ 1.01
v3.21.2
Organization and Basis of Presentation
 6 Months Ended
Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Organization and Basis of Presentation ORGANIZATION AND BASIS OF PRESENTATION
Corporate Structure
DTE Energy owns the following businesses:
•DTE Electric is a public utility engaged in the generation, purchase, distribution, and sale of electricity to approximately 2.2 million customers in southeastern Michigan;
•DTE Gas is a public utility engaged in the purchase, storage, transportation, distribution, and sale of natural gas to approximately 1.3 million customers throughout Michigan and the sale of storage and transportation capacity; and
•Other businesses primarily involved in 1) services related to the gathering, transportation, and storage of natural gas; 2) power and industrial projects; and 3) energy marketing and trading operations.
DTE Electric and DTE Gas are regulated by the MPSC. Certain activities of DTE Electric and DTE Gas, as well as various other aspects of businesses under DTE Energy, are regulated by the FERC. In addition, the Registrants are regulated by other federal and state regulatory agencies including the NRC, the EPA, EGLE, and for DTE Energy, the CFTC and CARB.
Basis of Presentation
The Consolidated Financial Statements should be read in conjunction with the Combined Notes to Consolidated Financial Statements included in the combined DTE Energy and DTE Electric 2020 Annual Report on Form 10-K.
The accompanying Consolidated Financial Statements of the Registrants are prepared using accounting principles generally accepted in the United States of America. These accounting principles require management to use estimates and assumptions that impact reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ from the Registrants' estimates.
The Consolidated Financial Statements are unaudited but, in the Registrants' opinions, include all adjustments necessary to present a fair statement of the results for the interim periods. All adjustments are of a normal recurring nature, except as otherwise disclosed in these Consolidated Financial Statements and Combined Notes to Consolidated Financial Statements. Financial results for this interim period are not necessarily indicative of results that may be expected for any other interim period or for the fiscal year ending December 31, 2021.
The information in these combined notes relates to each of the Registrants as noted in the Index of Combined Notes to Consolidated Financial Statements. However, DTE Electric does not make any representation as to information related solely to DTE Energy or the subsidiaries of DTE Energy other than itself.
On July 1, 2021, DTE Energy completed the previously announced separation of its natural gas pipeline, storage and gathering non-utility business. Effective with the separation, DTE retains no ownership in the new company, DT Midstream. The Consolidated Financial Statements and Combined Notes to Consolidated Financial Statements included herein are prior to the separation and all results as of and for the period ended June 30, 2021 include that of DT Midstream. Historical results of DT Midstream, which is primarily comprised of the Gas Storage and Pipelines segment and also includes certain DTE Energy holding company activity within the Corporate and Other segment, will be presented as discontinued operations beginning in the third quarter 2021. Any impacts to DTE Energy tax attributes will also be reflected in the third quarter financial statements. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information.
Principles of Consolidation
The Registrants consolidate all majority-owned subsidiaries and investments in entities in which they have controlling influence. Non-majority owned investments are accounted for using the equity method when the Registrants are able to significantly influence the operating policies of the investee. When the Registrants do not influence the operating policies of an investee, the equity investment is valued at cost minus any impairments, if applicable. These Consolidated Financial Statements also reflect the Registrants' proportionate interests in certain jointly-owned utility plants. The Registrants eliminate all intercompany balances and transactions.
The Registrants evaluate whether an entity is a VIE whenever reconsideration events occur. The Registrants consolidate VIEs for which they are the primary beneficiary. If a Registrant is not the primary beneficiary and an ownership interest is held, the VIE is accounted for under the equity method of accounting. When assessing the determination of the primary beneficiary, a Registrant considers all relevant facts and circumstances, including: the power, through voting or similar rights, to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb the expected losses and/or the right to receive the expected returns of the VIE. The Registrants perform ongoing reassessments of all VIEs to determine if the primary beneficiary status has changed.
Legal entities within DTE Energy's Power and Industrial Projects segment enter into long-term contractual arrangements with customers to supply energy-related products or services. The entities are generally designed to pass-through the commodity risk associated with these contracts to the customers, with DTE Energy retaining operational and customer default risk. These entities generally are VIEs and consolidated when DTE Energy is the primary beneficiary. In addition, DTE Energy has interests in certain VIEs through which control of all significant activities is shared with partners, and therefore are generally accounted for under the equity method.
Through June 30, 2021, DTE Energy owned an 85% interest in SGG, which owns and operates midstream natural gas assets. SGG has contracts through which certain construction risk was designed to pass-through to the customers, with DTE Energy retaining operational and customer default risk. SGG is a VIE with DTE Energy as the primary beneficiary.
The Registrants have variable interests in NEXUS, which include DTE Energy's 50% ownership interest through DT Midstream and DTE Electric's transportation services contract. NEXUS is a joint venture which owns a 256-mile pipeline to transport Utica and Marcellus shale gas to Ohio, Michigan, and Ontario market centers. NEXUS also owns Generation Pipeline, LLC, a 25-mile regulated pipeline system located in northern Ohio. NEXUS is a VIE as it has insufficient equity at risk to finance its activities. The Registrants are not the primary beneficiaries, as the power to direct significant activities is shared between the owners of the equity interests. DTE Energy accounts for its ownership interest in NEXUS under the equity method.
The Registrants hold ownership interests in certain limited partnerships. The limited partnerships include investment funds which support regional development and economic growth, and an operational business providing energy-related products. These entities are generally VIEs as a result of certain characteristics of the limited partnership voting rights. The ownership interests are accounted for under the equity method as the Registrants are not the primary beneficiaries.
DTE Energy has variable interests in VIEs through certain of its long-term purchase and sale contracts. DTE Electric has variable interests in VIEs through certain of its long-term purchase contracts, including the transportation services contract with NEXUS. As of June 30, 2021, the carrying amount of assets and liabilities in DTE Energy's Consolidated Statements of Financial Position that relate to its variable interests under long-term purchase and sale contracts are predominantly related to working capital accounts and generally represent the amounts owed by or to DTE Energy for the deliveries associated with the current billing cycle under the contracts. As of June 30, 2021, the carrying amount of assets and liabilities in DTE Electric's Consolidated Statements of Financial Position that relate to its variable interests under long-term purchase contracts are predominantly related to working capital accounts and generally represent the amounts owed by DTE Electric for the deliveries associated with the current billing cycle under the contracts. The Registrants have not provided any significant form of financial support associated with these long-term contracts. There is no material potential exposure to loss as a result of DTE Energy's variable interests through these long-term purchase and sale contracts. In addition, there is no material potential exposure to loss as a result of DTE Electric's variable interests through these long-term purchase contracts.
The maximum risk exposure for consolidated VIEs is reflected on the Registrants' Consolidated Statements of Financial Position and, for DTE Energy, in Note 13 to the Consolidated Financial Statements, "Commitments and Contingencies," related to REF guarantees and indemnities. For non-consolidated VIEs, the maximum risk exposure of the Registrants is generally limited to their investment, notes receivable, future funding commitments, and amounts which DTE Energy has guaranteed.
The following table summarizes the major Consolidated Statements of Financial Position items for consolidated VIEs as of June 30, 2021 and December 31, 2020. All assets and liabilities of a consolidated VIE are presented where it has been determined that a consolidated VIE has either (1) assets that can be used only to settle obligations of the VIE or (2) liabilities for which creditors do not have recourse to the general credit of the primary beneficiary. VIEs, in which DTE Energy holds a majority voting interest and is the primary beneficiary, that meet the definition of a business and whose assets can be used for purposes other than the settlement of the VIE's obligations have been excluded from the table below.
Amounts for DTE Energy's consolidated VIEs are as follows:
June 30, 2021December 31, 2020
SGG(a)
OtherTotal
SGG(a)
OtherTotal
(In millions)
ASSETS
Cash and cash equivalents$27 $22 $49 $34 $20 $54 
Accounts receivable9 24 33 8 28 36 
Inventories— 46 46 — 107 107 
Property, plant, and equipment, net398 17 415 402 23 425 
Goodwill25 — 25 25 — 25 
Intangible assets520 — 520 527 — 527 
Notes receivable and other2 60 62 2 33 35 
$981 $169 $1,150 $998 $211 $1,209 
LIABILITIES
Accounts payable$1 $22 $23 $— $22 $22 
Short-term borrowings— 69 69 — 38 38 
Other current and long-term liabilities7 2 9 7 4 11 
$8 $93 $101 $7 $64 $71 
_____________________________________
(a)Amounts shown are 100% of SGG's assets and liabilities, of which DTE Energy owned 85% at June 30, 2021 and December 31, 2020.
Amounts for DTE Energy's non-consolidated VIEs are as follows:
June 30, 2021December 31, 2020
(In millions)
Investments in equity method investees$1,503 $1,507 
Notes receivable$29 $47 
Future funding commitments$22 $26 
v3.21.2
Significant Accounting Policies
 6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]  
Significant Accounting Policies SIGNIFICANT ACCOUNTING POLICIES
Other Income
The following is a summary of DTE Energy's Other income:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Equity earnings of equity method investees$41 $30 $73 $59 
Income from REF entities21 29 45 52 
Contract services7 6 15 13 
Allowance for equity funds used during construction6 7 13 13 
Gains from rabbi trust securities(a)
2 22 4 22 
Other6 7 9 7 
$83 $101 $159 $166 
_______________________________________
(a)Losses from rabbi trust securities are recorded separately to Other expenses on the Consolidated Statements of Operations.
The following is a summary of DTE Electric's Other income:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Contract services$7 $6 $15 $13 
Allowance for equity funds used during construction6 6 12 12 
Gains from rabbi trust securities allocated from DTE Energy(a)
2 22 4 22 
Other4 3 7 3 
$19 $37 $38 $50 
_______________________________________
(a)Losses from rabbi trust securities are recorded separately to Other expenses on the Consolidated Statements of Operations.
Changes in Accumulated Other Comprehensive Income (Loss)
Comprehensive income (loss) is the change in common shareholders' equity during a period from transactions and events from non-owner sources, including Net Income. The amounts recorded to Accumulated other comprehensive income (loss) for DTE Energy include changes in benefit obligations, consisting of deferred actuarial losses and prior service costs, unrealized gains and losses from derivatives accounted for as cash flow hedges, and foreign currency translation adjustments. DTE Energy releases income tax effects from accumulated other comprehensive income when the circumstances upon which they are premised cease to exist.
Changes in Accumulated other comprehensive income (loss) are presented in DTE Energy's Consolidated Statements of Changes in Equity and DTE Electric's Consolidated Statements of Changes in Shareholder's Equity. For the three and six months ended months ended June 30, 2021 and 2020, reclassifications out of Accumulated other comprehensive income (loss) were not material.
Income Taxes
The interim effective tax rates of the Registrants are as follows:
Effective Tax Rate
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
DTE Energy11 %2 %8 %8 %
DTE Electric10 %12 %10 %12 %
These tax rates are affected by estimated annual permanent items, including AFUDC equity, production tax credits, and other flow-through items, as well as discrete items that may occur in any given period, but are not consistent from period to period.
The 9% increase in DTE Energy's effective tax rate for the three months ended June 30, 2021 was primarily due to the 2020 carryback of 2018 net operating losses due to the CARES Act of 12% and West Virginia tax law change of 4% in 2021, partially offset by an increase in production tax credits of 4% and higher amortization of the TCJA regulatory liability of 3%. There was no change in DTE Energy’s effective tax rate for the six months ended June 30, 2021 which included an increase in production tax credits of 3% and higher amortization of the TCJA regulatory liability of 3%, offset by the 2020 carryback of 2018 net operating losses due to the CARES Act of 5% and West Virginia tax law change of 1% in 2021.
The separation of DT Midstream on July 1, 2021 will impact DTE Energy's effective tax rate in future periods and adjustments will be incorporated beginning in the third quarter 2021.
The 2% decrease in DTE Electric's effective tax rate for the three and six months ended June 30, 2021 was primarily due to an increase in production tax credits of 1% and higher amortization of the TCJA regulatory liability of 1% in both periods.
DTE Electric had income tax receivables with DTE Energy of $2 million and $8 million at June 30, 2021 and December 31, 2020, respectively.
Unrecognized Compensation Costs
As of June 30, 2021, DTE Energy had $101 million of total unrecognized compensation cost related to non-vested stock incentive plan arrangements. That cost is expected to be recognized over a weighted-average period of 1.6 years.
Allocated Stock-Based Compensation
DTE Electric received an allocation of costs from DTE Energy associated with stock-based compensation of $11 million and $7 million for the three months ended June 30, 2021 and 2020, respectively, while such allocation was $25 million and $16 million for the six months ended June 30, 2021 and 2020, respectively.
Cash, Cash Equivalents, and Restricted Cash
Cash and cash equivalents include cash on hand, cash in banks, and temporary investments purchased with remaining maturities of three months or less. Restricted cash consists of funds held in separate bank accounts to satisfy contractual obligations and guarantee performance. Restricted cash designated for payments within one year is classified as a Current Asset.
Financing Receivables
Financing receivables are primarily composed of trade receivables, notes receivable, and unbilled revenue. The Registrants' financing receivables are stated at net realizable value.
The Registrants monitor the credit quality of their financing receivables on a regular basis by reviewing credit quality indicators and monitoring for trigger events, such as a credit rating downgrade or bankruptcy. Credit quality indicators include, but are not limited to, ratings by credit agencies where available, collection history, collateral, counterparty financial statements and other internal metrics. Utilizing such data, the Registrants have determined three internal grades of credit quality. Internal grade 1 includes financing receivables for counterparties where credit rating agencies have ranked the counterparty as investment grade. To the extent credit ratings are not available, the Registrants utilize other credit quality indicators to determine the level of risk associated with the financing receivable. Internal grade 1 may include financing receivables for counterparties for which credit rating agencies have ranked the counterparty as below investment grade; however, due to favorable information on other credit quality indicators, the Registrants have determined the risk level to be similar to that of an investment grade counterparty. Internal grade 2 includes financing receivables for counterparties with limited credit information and those with a higher risk profile based upon credit quality indicators. Internal grade 3 reflects financing receivables for which the counterparties have the greatest level of risk, including those in bankruptcy status.
The following represents the Registrants' financing receivables by year of origination, classified by internal grade of credit risk. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through June 30, 2021.
DTE EnergyDTE Electric
Year of origination
202120202019 and PriorTotal2021 and Prior
(In millions)
Notes receivable
Internal grade 1$— $— $24 $24 $14 
Internal grade 21 86 22 109 2 
Internal grade 3— — 11 11 — 
Total notes receivable(a)
$1 $86 $57 $144 $16 
Net investment in leases
Net investment in leases, internal grade 1$— $3 $39 $42 $— 
Net investment in leases, internal grade 2— 160 1 161 — 
Total net investment in leases(a)
$— $163 $40 $203 $— 
_______________________________________
(a)For DTE Energy, included in Current Assets — Other and Other Assets — Notes Receivable on the Consolidated Statements of Financial Position. For DTE Electric, included in Current Assets — Other and Other Assets — Other on the Consolidated Statements of Financial Position.
The allowance for doubtful accounts on accounts receivable for the utility entities is generally calculated using an aging approach that utilizes rates developed in reserve studies. DTE Electric and DTE Gas establish an allowance for uncollectible accounts based on historical losses and management's assessment of existing and future economic conditions, customer trends and other factors. Customer accounts are generally considered delinquent if the amount billed is not received by the due date, which is typically in 21 days, however, factors such as assistance programs may delay aggressive action. DTE Electric and DTE Gas generally assess late payment fees on trade receivables based on past-due terms with customers. Customer accounts are written off when collection efforts have been exhausted. The time period for write-off is 150 days after service has been terminated.
The customer allowance for doubtful accounts for non-utility businesses and other receivables for both utility and non-utility businesses is generally calculated based on specific review of probable future collections based on receivable balances generally in excess of 30 days. Existing and future economic conditions, customer trends and other factors are also considered. Receivables are written off on a specific identification basis and determined based upon the specific circumstances of the associated receivable.
Notes receivable for DTE Energy are primarily comprised of finance lease receivables and loans that are included in Notes Receivable and Other current assets on DTE Energy's Consolidated Statements of Financial Position. Notes receivable for DTE Electric are primarily comprised of loans.
Notes receivable are typically considered delinquent when payment is not received for periods ranging from 60 to 120 days. The Registrants cease accruing interest (nonaccrual status), consider a note receivable impaired, and establish an allowance for credit loss when it is probable that all principal and interest amounts due will not be collected in accordance with the contractual terms of the note receivable. In determining the allowance for credit losses for notes receivable, the Registrants consider the historical payment experience and other factors that are expected to have a specific impact on the counterparty's ability to pay including existing and future economic conditions.
DTE Energy's Gas Storage & Pipelines segment has an investment in certain assets in the Utica shale region which is accounted for as a note receivable. In the second quarter 2021, DTE Energy assessed the note receivable for impairment due to a reduction in forecasted volumes to be produced by the assets. As a result of fair value analysis, DTE Energy recorded a $19 million impairment of the note receivable, which is included in Asset (gains) losses and impairments, net on DTE Energy's Consolidated Statements of Operations for the three and six months ended June 30, 2021. Additionally, DTE Energy ceased accruing interest on the note receivable and reclassified the note to an Internal grade 3 receivable. There is no further risk of impairment to DTE Energy as the note receivable will transfer to DT Midstream upon its separation on July 1, 2021.
DTE Energy has off balance sheet exposure in the form of a revolving credit facility. Refer to Note 13, "Commitments and Contingencies," for additional information. In determining the level of credit reserve needed, DTE considers the likelihood of funding in addition to the other factors noted above. A reserve may be established when it is likely that funding will occur. Cash payments received on nonaccrual status notes receivable, that do not bring the account contractually current, are first applied to the contractually owed past due interest, with any remainder applied to principal. Accrual of interest is generally resumed when the note receivable becomes contractually current.
The following tables present a roll-forward of the activity for the Registrants' financing receivables credit loss reserves:
DTE EnergyDTE Electric
Trade accounts receivableOther receivablesTotalTrade and other accounts receivable
(In millions)
Beginning reserve balance, January 1, 2021$101 $3 $104 $57 
Current period provision 33 1 34 17 
Write-offs charged against allowance(60)(1)(61)(40)
Recoveries of amounts previously written off38 — 38 22 
Ending reserve balance, June 30, 2021$112 $3 $115 $56 

DTE EnergyDTE Electric
Trade accounts receivableOther receivablesTotalTrade and other accounts receivable
(In millions)
Beginning reserve balance, January 1, 2020$87 $4 $91 $46 
Current period provision100 3 103 61 
Write-offs charged against allowance(136)(4)(140)(80)
Recoveries of amounts previously written off50 — 50 30 
Ending reserve balance, December 31, 2020$101 $3 $104 $57 
Uncollectible expense for the Registrants is primarily comprised of the current period provision for allowance for doubtful accounts and is summarized as follows:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
DTE Energy$4 $15 $35 $48 
DTE Electric5 9 16 26 
There are no material amounts of past due financing receivables for the Registrants as of June 30, 2021.
v3.21.2
New Accounting Pronouncements
 6 Months Ended
Jun. 30, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]  
New Accounting Pronouncements NEW ACCOUNTING PRONOUNCEMENTS
Recently Adopted Pronouncements
In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes. The amendments in this update simplify the accounting for income taxes by removing certain exceptions, and clarifying certain requirements regarding franchise taxes, goodwill, consolidated tax expenses, and annual effective tax rate calculations. The Registrants adopted the ASU effective January 1, 2021 using the modified retrospective and prospective approaches, where applicable. The adoption of the ASU did not have a significant impact on the Registrants' Consolidated Financial Statements.
In August 2020, the FASB issued ASU No. 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity. The amendments in this update simplify the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts indexed to and potentially settled in an entity's own equity. The Registrants adopted the ASU effective January 1, 2021 using the modified retrospective approach. The adoption of the ASU did not have a significant impact on the Registrants' Consolidated Financial Statements.
Recently Issued Pronouncements
In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting, as amended. The amendments in this update provide optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The guidance can be applied prospectively from any date beginning March 12, 2020 through December 31, 2022. The optional relief is temporary and cannot be applied to contract modifications and hedging relationships entered into or evaluated after December 31, 2022. The Registrants presently have various contracts that reference LIBOR and are assessing how this standard may be applied to specific contract modifications.
In July 2021, the FASB issued ASU No. 2021-05, Leases (Topic 842): Lessors – Certain Leases with Variable Lease Payments. The amendments in this update modify lease classification requirements for lessors, providing that lease contracts with variable lease payments that do not depend on a reference index or a rate should be classified as operating leases if they would have been classified as a sales-type or direct financing lease and resulted in the recognition of a selling loss at lease commencement. The ASU is effective for the Registrants for fiscal years beginning after December 15, 2021, and interim periods therein. Early adoption is permitted. The Registrants are currently assessing the impact of this standard on their Consolidated Financial Statements.
v3.21.2
Dispositions and Impairments
 6 Months Ended
Jun. 30, 2021
Discontinued Operations and Disposal Groups [Abstract]  
Dispositions and Impairments DISPOSITIONS AND IMPAIRMENTS
Separation of DT Midstream
On October 27, 2020, DTE Energy announced that its Board of Directors had authorized management to pursue a plan to spin-off its natural gas pipeline, storage and gathering non-utility business. On July 1, 2021, DTE Energy completed the separation of the new company, DT Midstream, through the distribution of 96,732,466 shares of DT Midstream common stock to DTE Energy shareholders. The distribution reflected 100% of the outstanding common stock of DT Midstream as of 5:00 p.m. ET on June 18, 2021 (the “record date”). DTE Energy shareholders received one share of DT Midstream common stock for every two shares of DTE Energy common stock held at the close of business on the record date, with certain shareholders receiving cash in lieu of fractional shares of DT Midstream common stock. For U.S. federal income tax purposes, DTE Energy’s U.S. shareholders generally should not recognize gain or loss as a result of the distribution of DT Midstream stock, except with respect to cash received in lieu of fractional shares.
In June 2021, in order to facilitate the separation and settle intercompany balances with DTE Energy, DT Midstream issued long-term debt in the form of $2.1 billion senior notes and a $1.0 billion term loan. Using the debt proceeds, net of discount and issuance costs of $53 million, DT Midstream made the following cash payments:
•Settled Short-term borrowings due to DTE Energy as of June 30, 2021 of $2,537 million
•Settled affiliate Accounts Receivable due from DTE Energy and affiliate Accounts payable due to DTE Energy as of June 30, 2021 for net cash paid to DTE Energy of $9 million
•Provided a one-time special dividend to DTE Energy of $501 million
These payments eliminated in consolidation and had no impact on DTE Energy’s Consolidated Financial Statements of Financial Position for the period ended June 30, 2021. During July 2021, DTE Energy used the proceeds received from DT Midstream to optionally redeem $2.2 billion of long-term debt and provided notice of its intent to redeem an additional $374 million of long-term debt in August 2021. Refer to Note 10 to the Consolidated Financial Statements, “Long-term Debt,” for additional information. Prior to the debt redemptions, the proceeds were held in a temporary investment account within the Corporate and Other segment and included in Cash and cash equivalents in the Consolidated Statements of Financial Position as of June 30, 2021.
Through June 30, 2021, DTE Energy has incurred $43 million of transaction costs associated with the separation of DT Midstream, including legal, accounting and other professional services fees. These transaction costs included $24 million and $34 million for the three and six months ended June 30, 2021, respectively, and were recorded in Operation and maintenance expense in DTE Energy’s Consolidated Statements of Operations for the respective periods. DTE Energy expects additional transaction costs to be incurred in the third quarter in conjunction with the completed separation.
Following the separation on July 1, 2021, DT Midstream became an independent public company listed under the symbol “DTM” on the New York Stock Exchange (NYSE) and DTE Energy no longer retains any ownership in DT Midstream. In order to govern the ongoing relationships between DT Midstream and DTE Energy after the separation and to facilitate an orderly transition, the parties entered into a series of agreements including the following:
•Separation and Distribution Agreement – sets forth the principal actions to be taken in connection with the separation, including the transfer of assets and assumption of liabilities, among others, and sets forth other agreements governing aspects of the relationship between DTE Energy and DT Midstream
•Transition Services Agreement – allows for DTE Energy to provide DT Midstream with specified services for a limited time and no longer than 24 months following the separation, including support for accounting, tax, legal, human resources, informational technology, and various other administrative and operational services
•Tax Matters Agreement – governs the respective rights, responsibilities and obligations of DTE Energy and DT Midstream after the separation with respect to all tax matters
•Employee Matters Agreement – addresses certain employment, compensation and benefits matters, including the allocation and treatment of certain assets and liabilities relating to DT Midstream employees
In addition, DTE Energy and its subsidiaries have various commercial agreements that will continue after the separation. These agreements include certain pipeline, gathering, and storage services and operating and maintenance agreements, and are not considered material to the Consolidated Financial Statements.
Power and Industrial Projects Segment Impairment
Power & Industrial Projects owns a pulverized coal facility located at DTE Electric’s River Rouge power plant. The facility provides pulverized coal to a steel industry customer through a supply agreement expiring in 2028. The River Rouge plant provides operation and maintenance services to the facility through an agreement which also expires in 2028.
During the second quarter 2021, DTE Electric retired the River Rouge plant and provided an early termination notice of the operation and maintenance services agreement with the pulverized coal facility. The termination will be effective December 31, 2021, at which point Power and Industrial Projects will cease operations at the facility.
In connection with these events, DTE Energy performed an impairment analysis of the pulverized coal facility long-lived assets in accordance with ASC 360, Property, Plant and Equipment. Based on its undiscounted cash flow projections, DTE Energy determined that the carrying value of the pulverized coal facility asset group is not recoverable. As a result, DTE Energy recorded a non-cash impairment charge of $27 million, which is included in Asset (gains) losses and impairments, net on DTE Energy’s Consolidated Statements of Operations for the three and six months ended June 30, 2021. The charge included $18 million to fully impair the long-lived assets recorded to Property, plant and equipment and a $9 million write-down of Other noncurrent assets to fair value. Fair value of the assets was determined using an income approach, which utilized assumptions including management’s best estimates of the expected future cash flows, the estimated useful life of the asset group and discount rate.
There were no other adjustments deemed necessary as of June 30, 2021 related to the closure of the facility. DTE Energy is currently monitoring contract negotiations with the steel industry customer to determine any future impacts. An estimate of such impacts cannot be determined at this time as alternatives are currently being evaluated; however, the likelihood of any impact being material to DTE Energy’s Consolidated Financial Statements is remote.
v3.21.2
Revenue
 6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue REVENUE
Disaggregation of Revenue
The following is a summary of revenues disaggregated by segment for DTE Energy:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Electric(a)
Residential$705 $671 $1,377 $1,269 
Commercial468 389 920 815 
Industrial147 120 306 276 
Other(b)
91 132 172 168 
Total Electric operating revenues(c)
$1,411 $1,312 $2,775 $2,528 
Gas
Gas sales$171 $169 $631 $563 
End User Transportation48 43 133 120 
Intermediate Transportation17 16 43 42 
Other(b)
29 23 70 66 
Total Gas operating revenues(d)
$265 $251 $877 $791 
Other segment operating revenues
Gas Storage and Pipelines(e)
$208 $172 $405 $342 
Power and Industrial Projects(f)
$394 $219 $760 $526 
Energy Trading(g)
$1,167 $740 $2,606 $1,653 
_______________________________________
(a)Revenues generally represent those of DTE Electric, except $3 million of Other revenues related to DTE Sustainable Generation for the three months ended June 30, 2021 and 2020 and $7 million for the six months ended June 30, 2021 and 2020.
(b)Includes revenue adjustments related to various regulatory mechanisms.
(c)Includes $5 million of Other revenues outside the scope of Topic 606 for the three months ended June 30, 2021 and 2020, and $8 million and $10 million for the six months ended June 30, 2021 and 2020, respectively.
(d)Includes $2 million and $3 million of Other revenues outside the scope of Topic 606 for the three months ended June 30, 2021 and 2020, respectively, and $4 million and $5 million for the six months ended June 30, 2021 and 2020, respectively. Revenues also include $2 million under Alternative Revenue Programs outside the scope of Topic 606 for the six months ended June 30, 2020.
(e)Includes revenues outside the scope of Topic 606 primarily related to $2 million of contracts accounted for as leases for the three months ended June 30, 2021 and 2020, and $4 million for the six months ended June 30, 2021 and 2020.
(f)Includes revenues outside the scope of Topic 606 primarily related to $22 million and $21 million of contracts accounted for as leases for the three months ended June 30, 2021 and 2020, respectively, and $44 million and $48 million for the six months ended June 30, 2021 and 2020, respectively.
(g)Includes revenues outside the scope of Topic 606 primarily related to $907 million and $467 million of derivatives for the three months ended June 30, 2021 and 2020, respectively, and $2.1 billion and $1.1 billion of derivatives for the six months ended June 30, 2021 and 2020, respectively.
Deferred Revenue
The following is a summary of deferred revenue activity:
DTE Energy
(In millions)
Beginning Balance, January 1, 2021$87 
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period46 
Revenue recognized that was included in the deferred revenue balance at the beginning of the period(19)
Ending Balance, June 30, 2021$114 
The deferred revenues at DTE Energy generally represent amounts paid by or receivable from customers for which the associated performance obligation has not yet been satisfied.
Deferred revenues include amounts associated with REC performance obligations under certain wholesale full requirements power contracts. Deferred revenues associated with RECs are recognized as revenue when control of the RECs has transferred.
Other performance obligations associated with deferred revenues include providing products and services related to customer prepayments. Deferred revenues associated with these products and services are recognized when control has transferred to the customer.
The following table represents deferred revenue amounts for DTE Energy that are expected to be recognized as revenue in future periods:
DTE Energy
(In millions)
2021$69 
202222 
20234 
20243 
20257 
2026 and thereafter9 
$114 
Transaction Price Allocated to the Remaining Performance Obligations
In accordance with optional exemptions available under Topic 606, the Registrants did not disclose the value of unsatisfied performance obligations for (1) contracts with an original expected length of one year or less, (2) with the exception of fixed consideration, contracts for which revenue is recognized at the amount to which the Registrants have the right to invoice for goods provided and services performed, and (3) contracts for which variable consideration relates entirely to an unsatisfied performance obligation.
Such contracts consist of varying types of performance obligations across the segments, including the supply and delivery of energy related products and services. Contracts with variable volumes and/or variable pricing, including those with pricing provisions tied to a consumer price or other index, have also been excluded as the related consideration under the contract is variable at inception of the contract. Contract lengths vary from cancellable to multi-year.
The Registrants expect to recognize revenue for the following amounts related to fixed consideration associated with remaining performance obligations in each of the future periods noted:
DTE EnergyDTE Electric
(In millions)
2021$142 $4 
2022382 7 
2023324 7 
2024209 7 
2025130 1 
2026 and thereafter535 — 
$1,722 $26 
v3.21.2
Regulatory Matters
 6 Months Ended
Jun. 30, 2021
Public Utilities, General Disclosures [Abstract]  
Regulatory Matters REGULATORY MATTERS
2020-2021 Accounting Applications
On July 9, 2020, the MPSC approved DTE Electric's request to accelerate amortization of the portion of its refundable federal income taxes regulatory liability related to non-plant accumulated deferred income tax balances that resulted from the TCJA. DTE Electric was authorized to increase amortization by $102 million beginning in May 2021, which would fully amortize this portion of the liability by the end of 2021 instead of April 2033. The accelerated amortization would not impact customer rates and would allow DTE Electric to defer its next rate case filing previously set for July 2020 to March 2021.
On February 26, 2021, DTE Electric filed an additional application requesting a delay in the accelerated amortization approved in the 2020 application. DTE Electric requested delaying the start of amortization from May 2021 to December 1, 2021, which would fully amortize these balances by the end of 2022 and allow DTE Electric to further defer its next rate case filing to October 2021 or later. The accounting application was approved by the MPSC on April 8, 2021.
2021 Securitization Filing
On March 26, 2021, DTE Electric filed an application requesting a financing order approving the securitization of $184 million of qualified costs related to the net book value of the River Rouge generation plant and tree trimming surge program costs. The filing requested collection of these qualifying costs from DTE Electric's customers.
A final MPSC order was issued on June 23, 2021 authorizing DTE Electric to proceed with the issuance of securitization bonds for qualified costs of up to $236 million, increased for the inclusion of deferred income taxes. The order authorized customer charges for the timely recovery of the amount securitized and other ongoing qualified costs. Securitization is expected in the fourth quarter 2021.
2021 Gas Rate Case Filing
DTE Gas filed a rate case with the MPSC on February 12, 2021 requesting an increase in base rates of $195 million based on a projected twelve-month period ending December 31, 2022. The requested increase in base rates is primarily due to an increase in net plant resulting from infrastructure investments and operating and maintenance expenses. The rate filing also requested an increase in return on equity from 9.9% to 10.25% and includes projected changes in sales and working capital. A final MPSC order in this case is expected by December 2021.
v3.21.2
Earnings Per Share
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Earnings Per Share EARNINGS PER SHARE
Basic earnings per share is calculated by dividing net income, adjusted for income allocated to participating securities, by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflect the dilution that would occur if any potentially dilutive instruments were exercised or converted into common shares. DTE Energy’s participating securities are restricted shares under the stock incentive program that contain rights to receive non-forfeitable dividends. Equity units and performance shares do not receive cash dividends; as such, these awards are not considered participating securities.
The following is a reconciliation of DTE Energy's basic and diluted income per share calculation:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions, except per share amounts)
Basic Earnings per Share
Net Income Attributable to DTE Energy Company$179 $277 $576 $617 
Less: Allocation of earnings to net restricted stock awards1 — 1 1 
Net income available to common shareholders — basic$178 $277 $575 $616 
Average number of common shares outstanding — basic193 192 193 192 
Basic Earnings per Common Share$0.92 $1.44 $2.97 $3.20 
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company$179 $277 $576 $617 
Less: Allocation of earnings to net restricted stock awards1 — 1 1 
Net income available to common shareholders — diluted$178 $277 $575 $616 
Average number of common shares outstanding — basic193 192 193 192 
Average dilutive equity units, performance share awards, and stock options1 1 1 — 
Average number of common shares outstanding — diluted194 193 194 192 
Diluted Earnings per Common Share(a)
$0.92 $1.44 $2.97 $3.20 
_______________________________________
(a)Equity Units excluded from the calculation of diluted EPS were approximately 9.5 million and 10.3 million for the three months ended June 30, 2021 and 2020, respectively, and 10.0 million and 10.3 million for the six months ended June 30, 2021 and 2020, respectively, as the dilutive stock price threshold was not met.
v3.21.2
Fair Value
 6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value FAIR VALUE
Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or liabilities. These inputs can be readily observable, market corroborated, or generally unobservable inputs. The Registrants make certain assumptions they believe that market participants would use in pricing assets or liabilities, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. Credit risk of the Registrants and their counterparties is incorporated in the valuation of assets and liabilities through the use of credit reserves, the impact of which was immaterial at June 30, 2021 and December 31, 2020. The Registrants believe they use valuation techniques that maximize the use of observable market-based inputs and minimize the use of unobservable inputs.
A fair value hierarchy has been established that prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. All assets and liabilities are required to be classified in their entirety based on the lowest level of input that is significant to the fair value measurement in its entirety. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. The Registrants classify fair value balances based on the fair value hierarchy defined as follows:
•Level 1 — Consists of unadjusted quoted prices in active markets for identical assets or liabilities that the Registrants have the ability to access as of the reporting date.
•Level 2 — Consists of inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data.
•Level 3 — Consists of unobservable inputs for assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost-benefit constraints.
The following table presents assets and liabilities for DTE Energy measured and recorded at fair value on a recurring basis:
June 30, 2021December 31, 2020
Level
1		Level
2		Level
3
Other(a)
Netting(b)
Net BalanceLevel
1		Level
2		Level
3
Other(a)
Netting(b)
Net Balance
(In millions)
Assets
Cash equivalents(c)
$3,325 $— $— $— $— $3,325 $438 $— $— $— $— $438 
Nuclear decommissioning trusts
Equity securities952 — — 216 — 1,168 947 — — 222 — 1,169 
Fixed income securities134 425 — 99 — 658 102 371 — 82 — 555 
Private equity and other— — — 159 — 159 — — — 104 — 104 
Cash equivalents34 — — — — 34 27 — — — — 27 
Other investments(d)
Equity securities62 — — — — 62 55 — — — — 55 
Fixed income securities7 — — — — 7 8 — — — — 8 
Cash equivalents86 — — — — 86 97 — — — — 97 
Derivative assets
Commodity contracts(e)
Natural gas180 110 46 — (289)47 99 74 60 — (156)77 
Electricity— 255 75 — (192)138 — 128 52 — (120)60 
Environmental & Other1 359 15 — (339)36 — 150 4 — (135)19 
Total derivative assets181 724 136 — (820)221 99 352 116 — (411)156 
Total$4,781 $1,149 $136 $474 $(820)$5,720 $1,773 $723 $116 $408 $(411)$2,609 
Liabilities
Derivative liabilities
Commodity contracts(e)
Natural gas$(131)$(170)$(227)$— $289 $(239)$(88)$(59)$(76)$— $151 $(72)
Electricity— (201)(124)— 192 (133)— (126)(42)— 125 (43)
Environmental & Other— (356)— — 339 (17)— (137)— — 129 (8)
Foreign currency exchange contracts— (7)— — — (7)— (5)— — (5)
Total$(131)$(734)$(351)$— $820 $(396)$(88)$(327)$(118)$— $405 $(128)
Net Assets (Liabilities) at end of period$4,650 $415 $(215)$474 $— $5,324 $1,685 $396 $(2)$408 $(6)$2,481 
Assets
Current$3,480 $530 $109 $— $(623)$3,496 $532 $260 $92 $— $(330)$554 
Noncurrent1,301 619 27 474 (197)2,224 1,241 463 24 408 (81)2,055 
Total Assets$4,781 $1,149 $136 $474 $(820)$5,720 $1,773 $723 $116 $408 $(411)$2,609 
Liabilities
Current$(124)$(511)$(220)$— $623 $(232)$(84)$(223)$(79)$— $318 $(68)
Noncurrent(7)(223)(131)— 197 (164)(4)(104)(39)— 87 (60)
Total Liabilities$(131)$(734)$(351)$— $820 $(396)$(88)$(327)$(118)$— $405 $(128)
Net Assets (Liabilities) at end of period$4,650 $415 $(215)$474 $— $5,324 $1,685 $396 $(2)$408 $(6)$2,481 
_______________________________________
(a)Amounts represent assets valued at NAV as a practical expedient for fair value.
(b)Amounts represent the impact of master netting agreements that allow DTE Energy to net gain and loss positions and cash collateral held or placed with the same counterparties.
(c)Amounts consisted of $1 million and $2 million of cash equivalents included in Restricted cash on DTE Energy's Consolidated Statements of Financial Position at June 30, 2021 and December 31, 2020, respectively. All other amounts are included in Cash and cash equivalents on the Consolidated Statements of Financial Position.
(d)Excludes cash surrender value of life insurance investments.
(e)For contracts with a clearing agent, DTE Energy nets all activity across commodities. This can result in some individual commodities having a contra balance.
The following table presents assets for DTE Electric measured and recorded at fair value on a recurring basis as of:
June 30, 2021December 31, 2020
Level 1Level 2Level 3
Other(a)
Net BalanceLevel 1Level 2Level 3
Other(a)
Net Balance
(In millions)
Assets
Cash equivalents$— $— $— $— $— $4 $— $— $— $4 
Nuclear decommissioning trusts
Equity securities952 — — 216 1,168 947 — — 222 1,169 
Fixed income securities134 425 — 99 658 102 371 — 82 555 
Private equity and other— — — 159 159 — — — 104 104 
Cash equivalents34 — — — 34 27 — — — 27 
Other investments
Equity securities18 — — — 18 16 — — — 16 
Cash equivalents11 — — — 11 11 — — — 11 
Derivative assets — FTRs— — 15 — 15 — — 4 — 4 
Total$1,149 $425 $15 $474 $2,063 $1,107 $371 $4 $408 $1,890 
Assets
Current$— $— $15 $— $15 $4 $— $4 $— $8 
Noncurrent1,149 425 — 474 2,048 1,103 371 — 408 1,882 
Total Assets$1,149 $425 $15 $474 $2,063 $1,107 $371 $4 $408 $1,890 
_______________________________________
(a)Amounts represent assets valued at NAV as a practical expedient for fair value.
Cash Equivalents
Cash equivalents include investments with maturities of three months or less when purchased. The cash equivalents shown in the fair value table are comprised of short-term investments and money market funds.
Nuclear Decommissioning Trusts and Other Investments
The nuclear decommissioning trusts and other investments hold debt and equity securities directly and indirectly through commingled funds. Exchange-traded debt and equity securities held directly, as well as publicly-traded commingled funds, are valued using quoted market prices in actively traded markets. Non-exchange traded fixed income securities are valued based upon quotations available from brokers or pricing services.
Non-publicly traded commingled funds holding exchange-traded equity or debt securities are valued based on stated NAVs. There are no significant restrictions for these funds and investments may be redeemed with 7 to 65 days notice depending on the fund. There is no intention to sell the investment in these commingled funds.
Private equity and other assets include a diversified group of funds that are classified as NAV assets. These funds primarily invest in limited partnerships, including private equity, private real estate and private credit. Distributions are received through the liquidation of the underlying fund assets over the life of the funds. There are generally no redemption rights. The limited partner must hold the fund for its life or find a third-party buyer, which may need to be approved by the general partner. The funds are established with varied contractual durations generally in the range of 7 years to 12 years. The fund life can often be extended by several years by the general partner, and further extended with the approval of the limited partners. Unfunded commitments related to these investments totaled $159 million and $183 million as of June 30, 2021 and December 31, 2020, respectively.
For pricing the nuclear decommissioning trusts and other investments, a primary price source is identified by asset type, class, or issue for each security. The trustee monitors prices supplied by pricing services and may use a supplemental price source or change the primary source of a given security if the trustee determines that another price source is considered preferable. The Registrants have obtained an understanding of how these prices are derived, including the nature and observability of the inputs used in deriving such prices.
Derivative Assets and Liabilities
Derivative assets and liabilities are comprised of physical and financial derivative contracts, including futures, forwards, options, and swaps that are both exchange-traded and over-the-counter traded contracts. Various inputs are used to value derivatives depending on the type of contract and availability of market data. Exchange-traded derivative contracts are valued using quoted prices in active markets. The Registrants consider the following criteria in determining whether a market is considered active: frequency in which pricing information is updated, variability in pricing between sources or over time, and the availability of public information. Other derivative contracts are valued based upon a variety of inputs including commodity market prices, broker quotes, interest rates, credit ratings, default rates, market-based seasonality, and basis differential factors. The Registrants monitor the prices that are supplied by brokers and pricing services and may use a supplemental price source or change the primary price source of an index if prices become unavailable or another price source is determined to be more representative of fair value. The Registrants have obtained an understanding of how these prices are derived. Additionally, the Registrants selectively corroborate the fair value of their transactions by comparison of market-based price sources. Mathematical valuation models are used for derivatives for which external market data is not readily observable, such as contracts which extend beyond the actively traded reporting period. The Registrants have established a Risk Management Committee whose responsibilities include directly or indirectly ensuring all valuation methods are applied in accordance with predefined policies. The development and maintenance of the Registrants' forward price curves has been assigned to DTE Energy's Risk Management Department, which is separate and distinct from the trading functions within DTE Energy.
The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for DTE Energy:
Three Months Ended June 30, 2021Three Months Ended June 30, 2020
Natural GasElectricityOtherTotalNatural GasElectricityOtherTotal
(In millions)
Net Assets (Liabilities) as of March 31$(89)$(19)$1 $(107)$8 $15 $1 $24 
Transfers into Level 3 from Level 2— — — — 2 — — 2 
Transfers from Level 3 into Level 2— — — — (5)— — (5)
Total gains (losses)
Included in earnings(a)
(128)(9)— (137)12 33 (8)37 
Recorded in Regulatory liabilities— — 16 16 — — 14 14 
Purchases, issuances, and settlements
Settlements36 (21)(2)13 3 (32)3 (26)
Net Assets (Liabilities) as of June 30$(181)$(49)$15 $(215)$20 $16 $10 $46 
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30(a)
$(98)$(18)$(15)$(131)$18 $20 $(16)$22 
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30$— $— $15 $15 $— $— $10 $10 
_______________________________________
(a)Amounts are reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, gas, and other — non-utility in DTE Energy's Consolidated Statements of Operations.
Six Months Ended June 30, 2021Six Months Ended June 30, 2020
Natural GasElectricityOtherTotalNatural GasElectricityOtherTotal
(In millions)
Net Assets (Liabilities) as of December 31$(16)$10 $4 $(2)$(15)$16 $3 $4 
Transfers from Level 3 into Level 2— — — — (4)— — (4)
Total gains (losses)
Included in earnings(a)
(195)16 — (179)36 53 (8)81 
Recorded in Regulatory liabilities— — 15 15 — — 12 12 
Purchases, issuances, and settlements
Settlements30 (75)(4)(49)3 (53)3 (47)
Net Assets (Liabilities) as of June 30$(181)$(49)$15 $(215)$20 $16 $10 $46 
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30(a)
$(192)$(24)$(15)$(231)$37 $42 $(16)$63 
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30$— $— $15 $15 $— $— $10 $10 
_______________________________________
(a)Amounts are reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, gas, and other — non-utility in DTE Energy's Consolidated Statements of Operations.
The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for DTE Electric:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Net Assets as of beginning of period$1 $1 $4 $3 
Change in fair value recorded in Regulatory liabilities16 14 15 12 
Purchases, issuances, and settlements
Settlements(2)(5)(4)(5)
Net Assets as of June 30$15 $10 $15 $10 
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30$15 $10 $15 $10 
Derivatives are transferred between levels primarily due to changes in the source data used to construct price curves as a result of changes in market liquidity. Transfers in and transfers out are reflected as if they had occurred at the beginning of the period. There were no transfers from or into Level 3 for DTE Electric during the three and six months ended June 30, 2021 and 2020.
The following tables present the unobservable inputs related to DTE Energy's Level 3 assets and liabilities:
June 30, 2021
Commodity ContractsDerivative AssetsDerivative LiabilitiesValuation TechniquesUnobservable InputRangeWeighted Average
(In millions)
Natural Gas$46 $(227)Discounted Cash FlowForward basis price (per MMBtu)$(1.41)—$2.47 /MMBtu$(0.09)/MMBtu
Electricity$75 $(124)Discounted Cash FlowForward basis price (per MWh)$(12)—$5 /MWh$(1)/MWh
December 31, 2020
Commodity ContractsDerivative AssetsDerivative LiabilitiesValuation TechniquesUnobservable InputRangeWeighted Average
(In millions)
Natural Gas$60 $(76)Discounted Cash FlowForward basis price (per MMBtu)$(0.86)—$2.50 /MMBtu$(0.07)/MMBtu
Electricity$52 $(42)Discounted Cash FlowForward basis price (per MWh)$(9)—$6 /MWh$— /MWh
The unobservable inputs used in the fair value measurement of the electricity and natural gas commodity types consist of inputs that are less observable due in part to lack of available broker quotes, supported by little, if any, market activity at the measurement date or are based on internally developed models. Certain basis prices (i.e., the difference in pricing between two locations) included in the valuation of natural gas and electricity contracts were deemed unobservable. The weighted average price for unobservable inputs was calculated using the average of forward price curves for natural gas and electricity and the absolute value of monthly volumes.
The inputs listed above would have had a direct impact on the fair values of the above security types if they were adjusted. A significant increase (decrease) in the basis price would have resulted in a higher (lower) fair value for long positions, with offsetting impacts to short positions.
Fair Value of Financial Instruments
The following table presents the carrying amount and fair value of financial instruments for DTE Energy:
June 30, 2021December 31, 2020
CarryingFair ValueCarryingFair Value
AmountLevel 1Level 2Level 3AmountLevel 1Level 2Level 3
(In millions)
Notes receivable(a), excluding lessor finance leases
$144 $— $— $144 $141 $— $— $141 
Short-term borrowings$69 $— $69 $— $38 $— $38 $— 
Notes payable(b)
$5 $— $— $5 $19 $— $— $19 
Long-term debt(c)
$22,909 $2,236 $21,728 $1,115 $19,439 $2,547 $18,230 $1,397 
_______________________________________
(a)Current portion included in Current Assets — Other on DTE Energy's Consolidated Statements of Financial Position.
(b)Included in Current Liabilities — Other and Other Liabilities — Other on DTE Energy's Consolidated Statements of Financial Position.
(c)Includes debt due within one year and excludes finance lease obligations. Carrying value also includes unamortized debt discounts and issuance costs.
The following table presents the carrying amount and fair value of financial instruments for DTE Electric:
June 30, 2021December 31, 2020
CarryingFair ValueCarryingFair Value
AmountLevel 1Level 2Level 3AmountLevel 1Level 2Level 3
(In millions)
Notes receivable(a)
$16 $— $— $16 $16 $— $— $16 
Short-term borrowings — affiliates$194 $— $— $194 $101 $— $— $101 
Notes payable(b)
$4 $— $— $4 $17 $— $— $17 
Long-term debt(c)
$8,943 $— $10,112 $150 $8,236 $— $9,579 $379 
_______________________________________
(a)Included in Current Assets — Other and Other Assets — Other on DTE Electric's Consolidated Statements of Financial Position.
(b)Included in Current Liabilities — Other and Other Liabilities — Other on DTE Electric's Consolidated Statements of Financial Position.
(c)Includes debt due within one year and excludes finance lease obligations. Carrying value also includes unamortized debt discounts and issuance costs.
For further fair value information on financial and derivative instruments, see Note 9 to the Consolidated Financial Statements, "Financial and Other Derivative Instruments."
Nuclear Decommissioning Trust Funds
DTE Electric has a legal obligation to decommission its nuclear power plants following the expiration of its operating licenses. This obligation is reflected as an Asset retirement obligation on DTE Electric's Consolidated Statements of Financial Position. Rates approved by the MPSC provide for the recovery of decommissioning costs of Fermi 2 and the disposal of low-level radioactive waste.
The following table summarizes DTE Electric's fair value of the nuclear decommissioning trust fund assets:
June 30, 2021December 31, 2020
(In millions)
Fermi 2$2,002 $1,841 
Fermi 13 3 
Low-level radioactive waste14 11 
$2,019 $1,855 
The costs of securities sold are determined on the basis of specific identification. The following table sets forth DTE Electric's gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Realized gains$35 $103 $59 $134 
Realized losses$(6)$(76)$(8)$(92)
Proceeds from sale of securities$366 $799 $637 $1,238 
Realized gains and losses from the sale of securities and unrealized gains and losses incurred by the Fermi 2 trust are recorded to Regulatory assets and the Nuclear decommissioning liability. Realized gains and losses from the sale of securities and unrealized gains and losses on the low-level radioactive waste funds are recorded to the Nuclear decommissioning liability.
The following table sets forth DTE Electric's fair value and unrealized gains and losses for the nuclear decommissioning trust funds:
June 30, 2021December 31, 2020
Fair
Value		Unrealized
Gains		Unrealized
Losses		Fair
Value		Unrealized
Gains		Unrealized
Losses
(In millions)
Equity securities$1,168 $546 $(4)$1,169 $481 $(6)
Fixed income securities658 24 (3)555 20 (1)
Private equity and other159 26 — 104 — — 
Cash equivalents34 — — 27 — — 
$2,019 $596 $(7)$1,855 $501 $(7)
The following table summarizes the fair value of the fixed income securities held in nuclear decommissioning trust funds by contractual maturity:
June 30, 2021
(In millions)
Due within one year$7 
Due after one through five years151 
Due after five through ten years113 
Due after ten years288 
$559 
Fixed income securities held in nuclear decommissioning trust funds include $99 million of non-publicly traded commingled funds that do not have a contractual maturity date.
Other Securities
At June 30, 2021 and December 31, 2020, the Registrants' securities included in Other investments on the Consolidated Statements of Financial Position were comprised primarily of investments within DTE Energy's rabbi trust. The rabbi trust was established to fund certain non-qualified pension benefits, and therefore changes in market value are recognized in earnings. Gains and losses are allocated from DTE Energy to DTE Electric and are included in Other Income or Other Expense, respectively, in the Registrants' Consolidated Statements of Operations. The following table summarizes the Registrant's gains (losses) related to the trust:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Gains (losses) related to equity securities$2 $16 $4 $(6)
Gains (losses) related to fixed income securities— 6 — (3)
$2 $22 $4 $(9)
v3.21.2
Financial and Other Derivative Instruments
 6 Months Ended
Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Financial and Other Derivative Instruments FINANCIAL AND OTHER DERIVATIVE INSTRUMENTS
The Registrants recognize all derivatives at their fair value as Derivative assets or liabilities on their respective Consolidated Statements of Financial Position unless they qualify for certain scope exceptions, including the normal purchases and normal sales exception. Further, derivatives that qualify and are designated for hedge accounting are classified as either hedges of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (cash flow hedge); or as hedges of the fair value of a recognized asset or liability or of an unrecognized firm commitment (fair value hedge). For cash flow hedges, the derivative gain or loss is deferred in Accumulated other comprehensive income (loss) and later reclassified into earnings when the underlying transaction occurs. For fair value hedges, changes in fair values for the derivative and hedged item are recognized in earnings each period. For derivatives that do not qualify or are not designated for hedge accounting, changes in fair value are recognized in earnings each period.
The Registrants' primary market risk exposure is associated with commodity prices, credit, and interest rates. The Registrants have risk management policies to monitor and manage market risks. The Registrants use derivative instruments to manage some of the exposure. DTE Energy uses derivative instruments for trading purposes in its Energy Trading segment. Contracts classified as derivative instruments include electricity, natural gas, oil, certain environmental contracts, forwards, futures, options, swaps, and foreign currency exchange contracts. Items not classified as derivatives include natural gas and environmental inventory, pipeline transportation contracts, certain environmental contracts, and natural gas storage assets.
DTE Electric — DTE Electric generates, purchases, distributes, and sells electricity. DTE Electric uses forward contracts to manage changes in the price of electricity and fuel. Substantially all of these contracts meet the normal purchases and normal sales exception and are therefore accounted for under the accrual method. Other derivative contracts are MTM and recoverable through the PSCR mechanism when settled. This results in the deferral of unrealized gains and losses as Regulatory assets or liabilities until realized.
DTE Gas — DTE Gas purchases, stores, transports, distributes, and sells natural gas, and buys and sells transportation and storage capacity. DTE Gas has fixed-priced contracts for portions of its expected natural gas supply requirements through March 2024. Substantially all of these contracts meet the normal purchases and normal sales exception and are therefore accounted for under the accrual method. Forward transportation and storage contracts are generally not derivatives and are therefore accounted for under the accrual method.
Gas Storage and Pipelines — This segment has been primarily engaged in services related to the gathering, transportation, and storage of natural gas. Primarily fixed-priced contracts have been used in the marketing and management of transportation and storage services. Generally, these contracts were not derivatives and were therefore accounted for under the accrual method. These contracts will not be retained by DTE Energy following the separation of DT Midstream on July 1, 2021.
Power and Industrial Projects — This segment manages and operates energy and pulverized coal projects, a coke battery, reduced emissions fuel projects, renewable gas recovery, and power generation assets. Primarily fixed-price contracts are used in the marketing and management of the segment assets. These contracts are generally not derivatives and are therefore accounted for under the accrual method.
Energy Trading — Commodity Price Risk — Energy Trading markets and trades electricity, natural gas physical products, and energy financial instruments, and provides energy and asset management services utilizing energy commodity derivative instruments. Forwards, futures, options, and swap agreements are used to manage exposure to the risk of market price and volume fluctuations in its operations. These derivatives are accounted for by recording changes in fair value to earnings unless hedge accounting criteria are met.
Energy Trading — Foreign Currency Exchange Risk — Energy Trading has foreign currency exchange forward contracts to economically hedge fixed Canadian dollar commitments existing under natural gas and power purchase and sale contracts and natural gas transportation contracts. Energy Trading enters into these contracts to mitigate price volatility with respect to fluctuations of the Canadian dollar relative to the U.S. dollar. These derivatives are accounted for by recording changes in fair value to earnings unless hedge accounting criteria are met.
Corporate and Other — Interest Rate Risk — DTE Energy may use interest rate swaps, treasury locks, and other derivatives to hedge the risk associated with interest rate market volatility.
Credit Risk — DTE Energy maintains credit policies that significantly minimize overall credit risk. These policies include an evaluation of potential customers’ and counterparties’ financial condition, including the viability of underlying productive assets, credit rating, collateral requirements, or other credit enhancements such as letters of credit or guarantees. DTE Energy generally uses standardized agreements that allow the netting of positive and negative transactions associated with a single counterparty. DTE Energy maintains a provision for credit losses based on factors surrounding the credit risk of its customers, historical trends, and other information. Based on DTE Energy's credit policies and its June 30, 2021 provision for credit losses, DTE Energy’s exposure to counterparty nonperformance is not expected to have a material adverse effect on DTE Energy's Consolidated Financial Statements.
Derivative Activities
DTE Energy manages its MTM risk on a portfolio basis based upon the delivery period of its contracts and the individual components of the risks within each contract. Accordingly, it records and manages the energy purchase and sale obligations under its contracts in separate components based on the commodity (e.g. electricity or natural gas), the product (e.g. electricity for delivery during peak or off-peak hours), the delivery location (e.g. by region), the risk profile (e.g. forward or option), and the delivery period (e.g. by month and year). The following describes the categories of activities represented by their operating characteristics and key risks:
•Asset Optimization — Represents derivative activity associated with assets owned and contracted by DTE Energy, including forward natural gas purchases and sales, natural gas transportation, and storage capacity. Changes in the value of derivatives in this category typically economically offset changes in the value of underlying non-derivative positions, which do not qualify for fair value accounting. The difference in accounting treatment of derivatives in this category and the underlying non-derivative positions can result in significant earnings volatility.
•Marketing and Origination — Represents derivative activity transacted by originating substantially hedged positions with wholesale energy marketers, producers, end-users, utilities, retail aggregators, and alternative energy suppliers.
•Fundamentals Based Trading — Represents derivative activity transacted with the intent of taking a view, capturing market price changes, or putting capital at risk. This activity is speculative in nature as opposed to hedging an existing exposure.
•Other — Includes derivative activity at DTE Electric related to FTRs. Changes in the value of derivative contracts at DTE Electric are recorded as Derivative assets or liabilities, with an offset to Regulatory assets or liabilities as the settlement value of these contracts will be included in the PSCR mechanism when realized.
The following table presents the fair value of derivative instruments for DTE Energy:
June 30, 2021December 31, 2020
Derivative
Assets		Derivative LiabilitiesDerivative
Assets		Derivative Liabilities
(In millions)
Derivatives designated as hedging instruments
Foreign currency exchange contracts$— $(4)$— $(4)
Derivatives not designated as hedging instruments
Commodity contracts
Natural gas$336 $(528)$233 $(223)
Electricity330 (325)180 (168)
Environmental & Other375 (356)154 (137)
Foreign currency exchange contracts— (3)— (1)
Total derivatives not designated as hedging instruments$1,041 $(1,212)$567 $(529)
Current$794 $(855)$446 $(386)
Noncurrent247 (361)121 (147)
Total derivatives$1,041 $(1,216)$567 $(533)
The following table presents the fair value of derivative instruments for DTE Electric:
June 30, 2021December 31, 2020
(In millions)
FTRs — Other current assets$15 $4 
Total derivatives not designated as hedging instruments$15 $4 
Certain of DTE Energy's derivative positions are subject to netting arrangements which provide for offsetting of asset and liability positions as well as related cash collateral. Such netting arrangements generally do not have restrictions. Under such netting arrangements, DTE Energy offsets the fair value of derivative instruments with cash collateral received or paid for those contracts executed with the same counterparty, which reduces DTE Energy's Total Assets and Liabilities. Cash collateral is allocated between the fair value of derivative instruments and customer accounts receivable and payable with the same counterparty on a pro-rata basis to the extent there is exposure. Any cash collateral remaining, after the exposure is netted to zero, is reflected in Accounts receivable and Accounts payable as collateral paid or received, respectively.
DTE Energy also provides and receives collateral in the form of letters of credit which can be offset against net Derivative assets and liabilities as well as Accounts receivable and payable. DTE Energy had issued letters of credit of $11 million and $7 million outstanding at June 30, 2021 and December 31, 2020, respectively, which could be used to offset net Derivative liabilities. Letters of credit received from third parties which could be used to offset net Derivative assets were $34 million and $9 million at June 30, 2021 and December 31, 2020, respectively. Such balances of letters of credit are excluded from the tables below and are not netted with the recognized assets and liabilities in DTE Energy's Consolidated Statements of Financial Position.
For contracts with certain clearing agents, the fair value of derivative instruments is netted against realized positions with the net balance reflected as either 1) a Derivative asset or liability or 2) an Account receivable or payable. Other than certain clearing agents, Accounts receivable and Accounts payable that are subject to netting arrangements have not been offset against the fair value of Derivative assets and liabilities.
The following table presents net cash collateral offsetting arrangements for DTE Energy:
June 30, 2021December 31, 2020
(In millions)
Cash collateral netted against Derivative assets$— $(12)
Cash collateral netted against Derivative liabilities— 6 
Cash collateral recorded in Accounts receivable(a)
23 14 
Cash collateral recorded in Accounts payable(a)
(1)(1)
Total net cash collateral posted (received)$22 $7 
_______________________________________
(a)Amounts are recorded net by counterparty.
The following table presents the netting offsets of Derivative assets and liabilities for DTE Energy:
June 30, 2021December 31, 2020
Gross Amounts of Recognized Assets (Liabilities)Gross Amounts Offset in the Consolidated Statements of Financial PositionNet Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial PositionGross Amounts of Recognized Assets (Liabilities)Gross Amounts Offset in the Consolidated Statements of Financial PositionNet Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position
(In millions)
Derivative assets
Commodity contracts
Natural gas$336 $(289)$47 $233 $(156)$77 
Electricity330 (192)138 180 (120)60 
Environmental & Other375 (339)36 154 (135)19 
Total derivative assets$1,041 $(820)$221 $567 $(411)$156 
Derivative liabilities
Commodity contracts
Natural gas$(528)$289 $(239)$(223)$151 $(72)
Electricity(325)192 (133)(168)125 (43)
Environmental & Other(356)339 (17)(137)129 (8)
Foreign currency exchange contracts(7)— (7)(5)— (5)
Total derivative liabilities$(1,216)$820 $(396)$(533)$405 $(128)
The following table presents the netting offsets of Derivative assets and liabilities showing the reconciliation of derivative instruments to DTE Energy's Consolidated Statements of Financial Position:
June 30, 2021December 31, 2020
Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
CurrentNoncurrentCurrentNoncurrentCurrentNoncurrentCurrentNoncurrent
(In millions)
Total fair value of derivatives$794 $247 $(855)$(361)$446 $121 $(386)$(147)
Counterparty netting(623)(197)623 197 (318)(81)318 81 
Collateral adjustment— — — — (12)— — 6 
Total derivatives as reported$171 $50 $(232)$(164)$116 $40 $(68)$(60)
The effect of derivatives not designated as hedging instruments on DTE Energy's Consolidated Statements of Operations is as follows:
Location of Gain (Loss) Recognized in Income on DerivativesGain (Loss) Recognized in Income on Derivatives for the Three Months Ended June 30,Gain (Loss) Recognized in Income on Derivatives for the Six Months Ended June 30,
2021202020212020
(In millions)
Commodity contracts
Natural gasOperating Revenues — Non-utility operations$(114)$(25)$(157)$(36)
Natural gasFuel, purchased power, gas, and other — non-utility(24)43 (79)79 
ElectricityOperating Revenues — Non-utility operations42 41 75 42 
Environmental & OtherOperating Revenues — Non-utility operations(7)(63)(39)(41)
Foreign currency exchange contractsOperating Revenues — Non-utility operations(1)(3)(3)2 
Total$(104)$(7)$(203)$46 
Revenues and energy costs related to trading contracts are presented on a net basis in DTE Energy's Consolidated Statements of Operations. Commodity derivatives used for trading purposes, and financial non-trading commodity derivatives, are accounted for using the MTM method with unrealized and realized gains and losses recorded in Operating Revenues — Non-utility operations. Non-trading physical commodity sale and purchase derivative contracts are generally accounted for using the MTM method with unrealized and realized gains and losses for sales recorded in Operating Revenues — Non-utility operations and purchases recorded in Fuel, purchased power, gas, and other — non-utility.
The following represents the cumulative gross volume of DTE Energy's derivative contracts outstanding as of June 30, 2021:
CommodityNumber of Units
Natural gas (MMBtu)1,839,526,884 
Electricity (MWh)33,751,897 
Foreign currency exchange ($ CAD)121,659,867 
Renewable Energy Certificates (MWh)11,051,843 
Carbon emissions (Metric Tons)28,873,477 
Various subsidiaries of DTE Energy have entered into contracts which contain ratings triggers and are guaranteed by DTE Energy. These contracts contain provisions which allow the counterparties to require that DTE Energy post cash or letters of credit as collateral in the event that DTE Energy’s credit rating is downgraded below investment grade. Certain of these provisions (known as "hard triggers") state specific circumstances under which DTE Energy can be required to post collateral upon the occurrence of a credit downgrade, while other provisions (known as "soft triggers") are not as specific. For contracts with soft triggers, it is difficult to estimate the amount of collateral which may be requested by counterparties and/or which DTE Energy may ultimately be required to post. The amount of such collateral which could be requested fluctuates based on commodity prices (primarily natural gas, power, environmental, and coal) and the provisions and maturities of the underlying transactions. As of June 30, 2021, DTE Energy's contractual obligation to post collateral in the form of cash or letters of credit in the event of a downgrade to below investment grade, under both hard trigger and soft trigger provisions, was $467 million.
As of June 30, 2021, DTE Energy had $969 million of derivatives in net liability positions, for which hard triggers exist. There is no collateral that has been posted against such liabilities, including cash and letters of credit. Associated derivative net asset positions for which contractual offset exists were $821 million. The net remaining amount of $148 million is derived from the $467 million noted above.
v3.21.2
Long-Term Debt
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Long-Term Debt LONG-TERM DEBT
Debt Issuances
In 2021, the following debt was issued:
CompanyMonthTypeInterest RateMaturity DateAmount
(In millions)
DTE ElectricMarch
Mortgage bonds(a)
1.90%2028$575 
DTE ElectricMarch
Mortgage bonds(a)
3.25%2051425 
DT MidstreamJune
Senior notes(b)
4.125%20291,100 
DT MidstreamJune
Senior notes(b)
4.375%20311,000 
DT MidstreamJune
Term loan facility(b)
Variable(c)
20281,000 
$4,100 
_______________________________________
(a)Bonds were issued as Green Bonds and the proceeds will be used to finance qualified expenditures for solar and wind energy, payments under power purchase agreements for solar and wind energy, and energy optimization programs.
(b)Proceeds were used for the repayment of short-term borrowings due to DTE Energy to facilitate the separation of DT Midstream, as well as a one-time special dividend provided to DTE Energy. The debt will remain with DT Midstream following its separation on July 1, 2021. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information and to the Debt Redemptions section below for DTE Energy's use of the proceeds received from DT Midstream.
(c)Variable rate is LIBOR plus 2.00%, where LIBOR will not be less than 0.50%. The term loan facility includes $900 million with a six-month LIBOR interest period and $100 million with a three-month LIBOR interest period.
Debt Redemptions
Through June 2021, the following debt was redeemed:
CompanyMonthTypeInterest RateMaturity DateAmount
(In millions)
DTE ElectricAprilMortgage bonds3.90%2021$250 
DTE ElectricMayMortgage bonds7.00%202133 
DTE EnergyJune
Junior subordinated debentures(a)
5.375%2076300 
$583 
_______________________________________
(a)Early redemption resulted in a loss on extinguishment of debt of $8 million relating to the write-off of unamortized issuance costs. The loss was recorded to Other expenses on DTE Energy's Consolidated Statements of Operations for the three and six months ended June 30, 2021.
In July 2021, DTE Energy used proceeds from DT Midstream’s repayment of short-term borrowings and one-time special dividend to optionally redeem $2.2 billion of additional long-term debt, including the following:
CompanyMonthTypeInterest RateMaturity DateAmount
(In millions)
DTE EnergyJulySenior notes3.30%2022$300 
DTE EnergyJulySenior notes2.60%2022300 
DTE EnergyJulySenior notes3.70%2023600 
DTE EnergyJulySenior notes3.85%2023135 
DTE EnergyJulySenior notes3.50%2024350 
DTE EnergyJulySenior notes3.80%2027350 
DTE EnergyJulySenior notes3.40%202921 
DTE EnergyJulySenior notes6.375%2033191 
$2,247 
Additionally in July 2021, DTE Energy provided notice of its intent to call for redemption $165 million of its 3.85% Senior notes due in 2023 and $209 million of its 6.375% Senior notes due in 2033, both to be redeemed in August 2021 using the remaining proceeds received from DT Midstream.
To early retire this debt and reduce future interest expense, DTE Energy incurred prepayment costs of $235 million in July 2021 and expects additional prepayment costs in conjunction with the planned redemptions in August 2021. Prepayment costs and any write-offs of unamortized issuance costs and discounts related to the retired debt will result in a loss on extinguishment of debt to be reflected in the Consolidated Statements of Operations for the third quarter 2021.
v3.21.2
Short-Term Credit Arrangements and Borrowings
 6 Months Ended
Jun. 30, 2021
Short-term Debt [Abstract]  
Short-Term Credit Arrangements and Borrowings SHORT-TERM CREDIT ARRANGEMENTS AND BORROWINGS
DTE Energy, DTE Electric, and DTE Gas have unsecured revolving credit agreements that can be used for general corporate borrowings, but are intended to provide liquidity support for each of the companies’ commercial paper programs. Borrowings under the revolvers are available at prevailing short-term interest rates. DTE Energy also has other facilities to support letter of credit issuance.
The unsecured revolving credit agreements have historically required DTE Energy, DTE Electric, and DTE Gas to maintain a total funded debt to capitalization ratio of no more than 0.65 to 1. In the agreements, "total funded debt" means all indebtedness of each respective company and their consolidated subsidiaries, including finance lease obligations, hedge agreements, and guarantees of third parties’ debt, but excluding contingent obligations, nonrecourse and junior subordinated debt, and certain equity-linked securities and, except for calculations at the end of the second quarter, certain DTE Gas short-term debt. "Capitalization" means the sum of (a) total funded debt plus (b) "consolidated net worth," which is equal to consolidated total equity of each respective company and their consolidated subsidiaries (excluding pension effects under certain FASB statements), as determined in accordance with accounting principles generally accepted in the United States of America. At June 30, 2021, the total funded debt to total capitalization ratios for DTE Energy, DTE Electric, and DTE Gas were 0.64 to 1, 0.53 to 1, and 0.47 to 1, respectively, and were in compliance with this financial covenant.
In June 2021, DTE Energy amended its total funded debt to capitalization ratio requirement to no more than 0.70 to 1 starting with the third quarter of 2021 and ending December 2022. The amendment was a result of temporary balance sheet impacts resulting from the separation of DT Midstream on July 1, 2021.
Additionally in June 2021, DT Midstream entered into a $750 million secured revolving credit agreement. Letter of credit issuances and borrowings under the agreement are primarily for the general corporate purposes of DT Midstream to support its future operations and liquidity. Financial covenants under the agreement will be effective for DT Midstream beginning in the third quarter 2021.
For DTE Energy, availability under the DT Midstream secured revolving credit agreement was limited to $33 million, including an $8 million letter of credit issuance in June 2021 and additional credit up to $25 million, of which no amounts were drawn as of June 30, 2021. The facility and its available credit will not be retained by DTE Energy following the separation of DT Midstream on July 1, 2021.
The availability under these facilities as of June 30, 2021 is shown in the following table:
DTE EnergyDTE ElectricDTE GasTotal
(In millions)
Unsecured revolving credit facility, expiring April 2025(a)
$1,500 $500 $300 $2,300 
Unsecured Canadian revolving credit facility, expiring May 202389 — — 89 
Secured revolving credit facility, expiring June 2026(b)
33 — — 33 
Unsecured letter of credit facility, expiring in February 2023150 — — 150 
Unsecured letter of credit facility, expiring in August 2021110 — — 110 
Unsecured letter of credit facility(c)
50 — — 50 
1,932 500 300 2,732 
Amounts outstanding at June 30, 2021
Revolver borrowings69 — — 69 
Letters of credit230 — — 230 
299 — — 299 
Net availability at June 30, 2021$1,633 $500 $300 $2,433 
_______________________________________
(a)Total availability of $102 million expires in April 2024, including $67 million at DTE Energy, $22 million at DTE Electric, and $13 million at DTE Gas. All other availability expires in April 2025.
(b)For DT Midstream $750 million revolving credit facility, availability shown is limited to $33 million available to DTE Energy
(c)Uncommitted letter of credit facility with automatic renewal provision for each July and therefore no expiration.
DTE Energy has $9 million of other outstanding letters of credit which are used for various corporate purposes and are not included in the facilities described above.
In conjunction with maintaining certain exchange-traded risk management positions, DTE Energy may be required to post collateral with its clearing agents. DTE Energy has demand financing agreements with its clearing agents, including an agreement for up to $100 million with an indefinite term and an agreement for up to $150 million currently contracted through 2022 and subject to renewal. The $100 million agreement, as amended, also allows for up to $50 million of additional margin financing provided that DTE Energy posts a letter of credit for the incremental amount. Both agreements allow the right of setoff with posted collateral. At June 30, 2021, the capacity under the facilities was $300 million. The amounts outstanding under the agreements were $18 million and $49 million at June 30, 2021 and December 31, 2020, respectively, and were fully offset by the posted collateral.
v3.21.2
Leases
 6 Months Ended
Jun. 30, 2021
Leases [Abstract]  
Leases LEASES
Lessor
During the first quarter 2021, DTE Energy completed construction of and began operating certain energy infrastructure assets for a large industrial customer under a long-term agreement, where the assets will transfer to the customer at the end of the contract term in 2040. DTE Energy has accounted for a portion of the agreement as a finance lease arrangement, recognizing an additional net investment of $31 million.
The components of DTE Energy’s net investment in finance leases for remaining periods were as follows:
DTE Energy
June 30, 2021
(In millions)
2021$13 
202222 
202321 
202422 
202522 
2026 and Thereafter292 
Total minimum future lease receipts392 
Residual value of leased pipeline17 
Less unearned income206 
Net investment in finance lease203 
Less current portion8 
$195 
Interest income recognized under finance leases was $5 million and $4 million for the three months ended June 30, 2021 and 2020, respectively, and $9 million and $8 million for the six months ended June 30, 2021 and 2020, respectively.
DTE Energy’s lease income associated with operating leases, including the line items in which it was included on the Consolidated Statements of Operations, was as follows:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Fixed payments$16 $17 $33 $33 
Variable payments18 16 35 39 
34 33 68 72 
Operating revenues24 23 48 52 
Other income10 10 20 20 
$34 $33 $68 $72 
Leases LEASES
Lessor
During the first quarter 2021, DTE Energy completed construction of and began operating certain energy infrastructure assets for a large industrial customer under a long-term agreement, where the assets will transfer to the customer at the end of the contract term in 2040. DTE Energy has accounted for a portion of the agreement as a finance lease arrangement, recognizing an additional net investment of $31 million.
The components of DTE Energy’s net investment in finance leases for remaining periods were as follows:
DTE Energy
June 30, 2021
(In millions)
2021$13 
202222 
202321 
202422 
202522 
2026 and Thereafter292 
Total minimum future lease receipts392 
Residual value of leased pipeline17 
Less unearned income206 
Net investment in finance lease203 
Less current portion8 
$195 
Interest income recognized under finance leases was $5 million and $4 million for the three months ended June 30, 2021 and 2020, respectively, and $9 million and $8 million for the six months ended June 30, 2021 and 2020, respectively.
DTE Energy’s lease income associated with operating leases, including the line items in which it was included on the Consolidated Statements of Operations, was as follows:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Fixed payments$16 $17 $33 $33 
Variable payments18 16 35 39 
34 33 68 72 
Operating revenues24 23 48 52 
Other income10 10 20 20 
$34 $33 $68 $72 
Leases LEASES
Lessor
During the first quarter 2021, DTE Energy completed construction of and began operating certain energy infrastructure assets for a large industrial customer under a long-term agreement, where the assets will transfer to the customer at the end of the contract term in 2040. DTE Energy has accounted for a portion of the agreement as a finance lease arrangement, recognizing an additional net investment of $31 million.
The components of DTE Energy’s net investment in finance leases for remaining periods were as follows:
DTE Energy
June 30, 2021
(In millions)
2021$13 
202222 
202321 
202422 
202522 
2026 and Thereafter292 
Total minimum future lease receipts392 
Residual value of leased pipeline17 
Less unearned income206 
Net investment in finance lease203 
Less current portion8 
$195 
Interest income recognized under finance leases was $5 million and $4 million for the three months ended June 30, 2021 and 2020, respectively, and $9 million and $8 million for the six months ended June 30, 2021 and 2020, respectively.
DTE Energy’s lease income associated with operating leases, including the line items in which it was included on the Consolidated Statements of Operations, was as follows:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Fixed payments$16 $17 $33 $33 
Variable payments18 16 35 39 
34 33 68 72 
Operating revenues24 23 48 52 
Other income10 10 20 20 
$34 $33 $68 $72 
v3.21.2
Commitments and Contingencies
 6 Months Ended
Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingencies COMMITMENTS AND CONTINGENCIES
Environmental
DTE Electric
Air — DTE Electric is subject to the EPA ozone and fine particulate transport and acid rain regulations that limit power plant emissions of SO2 and NOX. The EPA and the State of Michigan have also issued emission reduction regulations relating to ozone, fine particulate, regional haze, mercury, and other air pollution. These rules have led to controls on fossil-fueled power plants to reduce SO2, NOX, mercury, and other emissions. Additional rulemakings may occur over the next few years which could require additional controls for SO2, NOX, and other hazardous air pollutants.
The EPA proposed revised air quality standards for ground level ozone in November 2014 and specifically requested comments on the form and level of the ozone standards. The standards were finalized in October 2015. The State of Michigan recommended to the EPA in October 2016 which areas of the state are not attaining the new standard. On April 30, 2018, the EPA finalized the State of Michigan's recommended marginal non-attainment designation for southeast Michigan. The State is required to develop and implement a plan to address the southeast Michigan ozone non-attainment area by the end of 2021. The Registrants cannot predict the scope and associated financial impact of the State's plan to address the ozone non-attainment area at this time.
The EPA has implemented regulatory actions under the Clean Air Act to address emissions of GHGs from the utility sector and other sectors of the economy. Among these actions, in 2015 the EPA finalized performance standards for emissions of carbon dioxide from new and existing fossil-fuel fired EGUs. The performance standards for existing EGUs, known as the EPA Clean Power Plan, were challenged by petitioners and stayed by the U.S. Supreme Court in February 2016 pending final review by the courts. On October 10, 2017, the EPA, under a new administration, proposed to rescind the Clean Power Plan, and in August 2018, the EPA proposed revised emission guidelines for GHGs from existing EGUs. On June 19, 2019, the EPA Administrator officially repealed the Clean Power Plan and finalized its replacement, named the ACE rule. The ACE rule was vacated and remanded back to the EPA in a D.C. Circuit Court decision on January 19, 2021. The next steps taken by the EPA with respect to regulation of GHGs from EGUs is uncertain. Regardless of future rules, DTE Energy remains committed for its electric utility operations to reduce carbon emissions 32% by 2023, 50% by 2030, and 80% by 2040 from 2005 carbon emissions levels, and its goal of net zero emissions for its electric utility operations by 2050.
In addition to the GHG standards for existing EGUs, in December 2018, the EPA issued proposed revisions to the carbon dioxide performance standards for new, modified, or reconstructed fossil-fuel fired EGUs. The carbon standards for new sources are not expected to have a material impact on DTE Electric, since DTE Electric has no plans to build new coal-fired generation and any potential new gas generation will be able to comply with the standards.
Pending or future legislation or other regulatory actions could have a material impact on DTE Electric's operations and financial position and the rates charged to its customers. Impacts include expenditures for environmental equipment beyond what is currently planned, financing costs related to additional capital expenditures, the purchase of emission credits from market sources, higher costs of purchased power, and the retirement of facilities where control equipment is not economical. DTE Electric would seek to recover these incremental costs through increased rates charged to its utility customers, as authorized by the MPSC.
To comply with air pollution requirements, DTE Electric has spent approximately $2.4 billion. DTE Electric does not anticipate additional capital expenditures for air pollution requirements through 2025, subject to the results of future rulemakings.
Water — In response to an EPA regulation, DTE Electric was required to examine alternatives for reducing the environmental impacts of the cooling water intake structures at several of its facilities. Based on the results of completed studies and expected future studies, DTE Electric may be required to install technologies to reduce the impacts of the water intake structures. A final rule became effective in October 2014. The final rule requires studies to be completed and submitted as part of the NPDES permit application process to determine the type of technology needed to reduce impacts to fish. DTE Electric has initiated the process of completing the required studies. Final compliance for the installation of any required technology will be determined by the state on a case by case, site specific basis. DTE Electric is currently evaluating the compliance options and working with the State of Michigan on evaluating whether any controls are needed. These evaluations/studies may require modifications to some existing intake structures. It is not possible to quantify the impact of this rulemaking at this time.
Contaminated and Other Sites — Prior to the construction of major interstate natural gas pipelines, gas for heating and other uses was manufactured locally from processes involving coal, coke, or oil. The facilities, which produced gas, have been designated as MGP sites. DTE Electric conducted remedial investigations at contaminated sites, including three former MGP sites. Cleanup of one of the MGP sites is complete, and the site is closed. The investigations have revealed contamination related to the by-products of gas manufacturing at each MGP site. In addition to the MGP sites, DTE Electric is also in the process of cleaning up other contaminated sites, including the area surrounding an ash landfill, electrical distribution substations, electric generating power plants, and underground and above ground storage tank locations. The findings of these investigations indicated that the estimated cost to remediate these sites is expected to be incurred over the next several years. At June 30, 2021 and December 31, 2020, DTE Electric had $10 million accrued for remediation. These costs are not discounted to their present value. Any change in assumptions, such as remediation techniques, nature and extent of contamination, and regulatory requirements, could impact the estimate of remedial action costs for the sites and affect DTE Electric’s financial position and cash flows. DTE Electric believes the likelihood of a material change to the accrued amount is remote based on current knowledge of the conditions at each site.
Coal Combustion Residuals and Effluent Limitations Guidelines — A final EPA rule for the disposal of coal combustion residuals, commonly known as coal ash, became effective in October 2015, and was revised in October 2016, July 2018, September 2020, and November 2020. The rule is based on the continued listing of coal ash as a non-hazardous waste and relies on various self-implementation design and performance standards. DTE Electric owns and operates three permitted engineered coal ash storage facilities to dispose of coal ash from coal-fired power plants and operates a number of smaller impoundments at its power plants subject to certain provisions in the CCR rule. At certain facilities, the rule currently requires ongoing sampling and testing of monitoring wells, compliance with groundwater standards, and the closure of basins at the end of the useful life of the associated power plant.
On September 28, 2020, the CCR rule "A Holistic Approach to Closure Part A: Deadline to Initiate Closure and Enhancing Public Access to Information" became effective and establishes April 11, 2021 as the new deadline for all unlined impoundments (including units previously classified as "clay-lined") to initiate closure. Additionally, the rule amends certain reporting requirements and CCR website requirements. On November 12, 2020, an additional revision to the CCR Rule "A Holistic Approach to Closure Part B: Alternate Demonstration for Unlined Surface Impoundments" was published in the Federal Register that provides a process to determine if certain unlined impoundments consist of an alternative liner system that may be as protective as the current liners specified in the CCR rule, and therefore may continue to operate. DTE Electric has submitted applications to the EPA that support continued use of all impoundments through their active lives. The forced closure date of April 11, 2021 is effectively delayed while the EPA's review looks to extend beyond this date.
At the State level, legislation was signed by the Governor in December 2018 and provides for further regulation of the CCR program in Michigan. Additionally, the bill provides the basis of a CCR program that EGLE has submitted to the EPA for approval to fully regulate the CCR program in Michigan in lieu of a Federal permit program.
In October 2020, the EPA published in the Federal Register the final version of the ELG Reconsideration Rule which updates the 2015 ELG Rule (2015 Rule). The Reconsideration Rule re-establishes the technology-based effluent limitations guidelines and standards applicable to flue gas desulfurization (FGD) wastewater and bottom ash transport water. The EPA set the applicability dates for bottom ash transport water and FGD wastewater retrofits to be "as soon as possible" beginning October 13, 2021 and no later than December 31, 2025. Compliance schedules for individual facilities and individual waste streams are determined through issuance of new NPDES permits by the State of Michigan. The State of Michigan has issued a NPDES permit for the Belle River Power Plant establishing a compliance deadline of December 31, 2021 based on the 2015 Rule. Due to completion of the Reconsideration Rule in 2020, the compliance deadlines within the NPDES permit for Belle River Power Plant will be revised accordingly. No new permits that would require ELG compliance have been issued for other facilities, consequently no compliance timelines have been established.
On April 12, 2017, the EPA granted a petition for reconsideration of the 2015 ELG Rule. The EPA also signed an administrative stay of the 2015 ELG Rule’s compliance deadlines for fly ash transport water, bottom ash transport water, and FGD wastewater, among others. On June 6, 2017, the EPA published in the Federal Register a proposed rule (Postponement Rule) to postpone certain applicable deadlines within the 2015 ELG rule. The Postponement Rule was published on September 18, 2017. The Postponement Rule nullified the administrative stay but also extended the earliest compliance deadlines for only FGD wastewater and bottom ash transport water until November 1, 2020 in order for the EPA to propose and finalize a new ruling. On October 13, 2020, the EPA finalized the ELG Reconsideration Rule which revised the regulations from the 2015 ELG rule. The Reconsideration Rule revises requirements for two specific waste streams produced by steam electric power plants: FGD wastewater and bottom ash transport water. The Reconsideration Rule also provides additional compliance opportunities by finalizing low utilization and cessation of coal burning subcategories. The Reconsideration Rule provides new opportunities for DTE Electric to evaluate existing ELG compliance strategies and make any necessary adjustments to ensure full compliance with the ELGs in a cost-effective manner.
DTE Electric is currently evaluating compliance strategies, technologies and system designs for both FGD wastewater and bottom ash transport water system to achieve compliance with the final rule.
DTE Electric has estimated the impact of the CCR and ELG rules to be $718 million of capital expenditures, including $573 million for 2021 through 2025.
DTE Gas
Air — In June 2020, DTE Energy expanded its net zero goal to include its gas utility operations by committing to reduce greenhouse gas emissions to net zero by 2050 from procurement of natural gas through delivery. As part of DTE Energy's 2050 net zero commitment, DTE Gas launched its CleanVision Natural Gas Balance program in January 2021 that offers customers a way to reduce their carbon footprint using carbon offsets and renewable natural gas. The carbon offset program is focused on protecting Michigan forests that naturally absorb carbon dioxide.
Contaminated and Other Sites — DTE Gas owns or previously owned 14 former MGP sites. Investigations have revealed contamination related to the by-products of gas manufacturing at each site. Cleanup of eight of the MGP sites is complete, and the sites are closed. DTE Gas has also completed partial closure of four additional sites. Cleanup activities associated with the remaining sites will continue over the next several years. The MPSC has established a cost deferral and rate recovery mechanism for investigation and remediation costs incurred at former MGP sites. In addition to the MGP sites, DTE Gas is also in the process of cleaning up other contaminated sites, including gate stations, gas pipeline releases, and underground storage tank locations. As of June 30, 2021 and December 31, 2020, DTE Gas had $23 million and $24 million, respectively, accrued for remediation. These costs are not discounted to their present value. Any change in assumptions, such as remediation techniques, nature and extent of contamination, and regulatory requirements, could impact the estimate of remedial action costs for the sites and affect DTE Gas' financial position and cash flows. DTE Gas anticipates the cost amortization methodology approved by the MPSC, which allows for amortization of the MGP costs over a ten-year period beginning with the year subsequent to the year the MGP costs were incurred, will prevent the associated investigation and remediation costs from having a material adverse impact on DTE Gas' results of operations.
Non-utility
DTE Energy's non-utility businesses are subject to a number of environmental laws and regulations dealing with the protection of the environment from various pollutants.
In March 2019, the EPA issued an FOV to EES Coke, the Michigan coke battery facility that is a wholly-owned subsidiary of DTE Energy, alleging that the 2008 and 2014 permits issued by EGLE did not comply with the Clean Air Act. In September 2020, the EPA issued another FOV alleging EES Coke's 2018 and 2019 SO2 emissions exceeded projections and hence violated non-attainment new source review requirements. EES Coke evaluated the EPA's alleged violations and believes that the permits approved by EGLE complied with the Clean Air Act. EES Coke also responded to the EPA's September 2020 allegations demonstrating its actual emissions are compliant with non-attainment new source review requirements. Discussions with the EPA are ongoing. At the present time, DTE Energy cannot predict the outcome or financial impact of this FOV.
Other
In 2010, the EPA finalized a new one-hour SO2 ambient air quality standard that requires states to submit plans and associated timelines for non-attainment areas that demonstrate attainment with the new SO2 standard in phases. Phase 1 addresses non-attainment areas designated based on ambient monitoring data. Phase 2 addresses non-attainment areas with large sources of SO2 and modeled concentrations exceeding the National Ambient Air Quality Standards for SO2. Phase 3 addresses smaller sources of SO2 with modeled or monitored exceedances of the new SO2 standard.
Michigan's Phase 1 non-attainment area includes DTE Energy facilities in southwest Detroit and areas of Wayne County. Modeling runs by EGLE suggest that emission reductions may be required by significant sources of SO2 emissions in these areas, including DTE Electric power plants and DTE Energy's Michigan coke battery facility. As part Michigan's SIP process, DTE Energy has worked with EGLE to develop air permits reflecting significant SO2 emission reductions that, in combination with other non-DTE Energy sources' emission reduction strategies, will help the state attain the standard and sustain its attainment. The Michigan SIP was completed and submitted to the EPA on May 31, 2016 and supplemented on June 30, 2016. On March 19, 2021, the EPA published in the Federal Register partial approval and partial disapproval of Michigan's Detroit SO2 non-attainment area plan. The partial disapproval does not appear to impact DTE's sources and further discussions are underway with the EPA to finalize the plan. Since several non-DTE Energy sources are also part of the proposed compliance plan, DTE Energy is unable to determine the full impact of any further emissions reductions that may be required from DTE's facilities at this time.
Michigan's Phase 2 non-attainment area includes DTE Electric facilities in St. Clair County. EGLE has not made a final determination on SIP strategy for this area, pending the EPA's review of a clean data determination request. Until agency plans are final, DTE Energy is unable to determine the impacts.
Synthetic Fuel Guarantees
DTE Energy discontinued the operations of its synthetic fuel production facilities throughout the United States as of December 31, 2007. DTE Energy provided certain guarantees and indemnities in conjunction with the sales of interests in its synfuel facilities. The guarantees cover potential commercial, environmental, oil price, and tax-related obligations that will survive until 90 days after expiration of all applicable statutes of limitations. DTE Energy estimates that its maximum potential liability under these guarantees at June 30, 2021 was approximately $400 million. Payment under these guarantees is considered remote.
REF Guarantees
DTE Energy has provided certain guarantees and indemnities in conjunction with the sales of interests in or lease of its REF facilities. The guarantees cover potential commercial, environmental, and tax-related obligations that will survive until 90 days after expiration of all applicable statutes of limitations. DTE Energy estimates that its maximum potential liability under these guarantees at June 30, 2021 was $617 million. Payments under these guarantees are considered remote.
Other Guarantees
In certain limited circumstances, the Registrants enter into contractual guarantees. The Registrants may guarantee another entity’s obligation in the event it fails to perform and may provide guarantees in certain indemnification agreements. Finally, the Registrants may provide indirect guarantees for the indebtedness of others. DTE Energy’s guarantees are not individually material with maximum potential payments totaling $50 million at June 30, 2021. Payments under these guarantees are considered remote.
The Registrants are periodically required to obtain performance surety bonds in support of obligations to various governmental entities and other companies in connection with its operations. As of June 30, 2021, DTE Energy had $176 million of performance bonds outstanding, including $120 million for DTE Electric. In the event that such bonds are called for nonperformance, the Registrants would be obligated to reimburse the issuer of the performance bond. The Registrants are released from the performance bonds as the contractual performance is completed and does not believe that a material amount of any currently outstanding performance bonds will be called.
Vector Line of Credit
In July 2019, DTE Energy, as lender, entered into a revolving term credit facility with Vector, as borrower, in the amount of C$70 million. The credit facility was executed in response to the passage of Canadian regulations requiring oil and gas pipelines to demonstrate their financial ability to respond to a catastrophic event and exists for the sole purpose of satisfying these regulations. Vector may only draw upon the facility if the funds are required to respond to a catastrophic event. The maximum potential payment under the line of credit at June 30, 2021 was $56 million. On July 7, 2021 and in conjunction with the separation of DT Midstream, DTE Energy transferred the credit facility to DT Midstream and DT Midstream assumed the lender role under the credit facility.
Labor Contracts
There are several bargaining units for DTE Energy subsidiaries' approximate 5,200 represented employees, including DTE Electric's approximately 2,700 represented employees. This represents 49% and 57% of DTE Energy's and DTE Electric's total employees, respectively. The majority of the represented employees are under contracts that expire in 2027.
Purchase Commitments
Utility capital expenditures, expenditures for non-utility businesses, and contributions to equity method investees will be approximately $3.9 billion and $3.0 billion in 2021 for DTE Energy and DTE Electric, respectively. The Registrants have made certain commitments in connection with the estimated 2021 annual capital expenditures and contributions to equity method investees.
Bankruptcies
DTE Energy Trading was the sole supplier of power for Brilliant Energy, LLC ("Brilliant"), a load serving entity and competitive retailer in ERCOT. During March 2021, Brilliant filed a voluntary petition for bankruptcy protection under Chapter 7 of the Bankruptcy Code. Subsequently, the bankruptcy court authorized a Trustee to continue managing Brilliant’s business to preserve any remaining value for their creditors and begin an orderly wind-down of Brilliant’s operations.
In June 2021, DTE Energy Trading completed the transfer of service for all of Brilliant's customer contracts to utilities in the ERCOT market and has no further service responsibilities related to Brilliant. For pre-petition receivables that were reserved during the first quarter 2021, approximately $9 million remains reserved as of June 30, 2021. Other pre-petition receivables of approximately $3 million were recovered during the second quarter 2021 and uncollectible expense was reversed. The remaining wind-down activities are expected to be completed in the third quarter 2021. DTE Energy does not believe there is any additional risk related to this bankruptcy.
COVID-19 Pandemic
DTE Energy has been actively monitoring the impact of the COVID-19 pandemic on supply chains, markets, counterparties, and customers, and any related impacts on operating costs, customer demand, and recoverability of assets that could materially impact the Registrants' financial results.
In 2021, the COVID-19 pandemic has continued to impact DTE Electric sales volumes. As businesses have maintained certain remote operations, related sales volumes have been lower for commercial and industrial customers and higher for residential customers as compared to historical volumes before the pandemic. This impact contributed to a net reduction in DTE Electric sales, but has been offset by favorable rate mix.
In 2020, COVID-19 also resulted in incremental costs at our utilities related to personal protective equipment and other health and safety-related matters, as well as lower volumes for certain companies within the Power and Industrial Projects segment. For the three and six months ended June 30, 2021, however, there has not been any significant impact to the Registrants' Consolidated Financial Statements.
In consideration of the above factors and all other current and expected impacts to the Registrants' performance and cash flows resulting from the COVID-19 pandemic, there have been no material adjustments or reserves deemed necessary as of June 30, 2021. The Registrants cannot predict the future impacts of the COVID-19 pandemic on the Consolidated Financial Statements, as developments involving COVID-19 and its related effects on economic and operating conditions remain highly uncertain.
Other Contingencies
The Registrants are involved in certain other legal, regulatory, administrative, and environmental proceedings before various courts, arbitration panels, and governmental agencies concerning claims arising in the ordinary course of business. These proceedings include certain contract disputes, additional environmental reviews and investigations, audits, inquiries from various regulators, and pending judicial matters. The Registrants cannot predict the final disposition of such proceedings. The Registrants regularly review legal matters and record provisions for claims that they can estimate and are considered probable of loss. The resolution of these pending proceedings is not expected to have a material effect on the Registrants' Consolidated Financial Statements in the periods they are resolved.
For a discussion of contingencies related to regulatory matters and derivatives, see Notes 6 and 9 to the Consolidated Financial Statements, "Regulatory Matters" and "Financial and Other Derivative Instruments," respectively.
v3.21.2
Retirement Benefits and Trusteed Assets
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Retirement Benefits and Trusteed Assets RETIREMENT BENEFITS AND TRUSTEED ASSETS
The following tables detail the components of net periodic benefit costs (credits) for pension benefits and other postretirement benefits for DTE Energy:
Pension BenefitsOther Postretirement Benefits
Three Months Ended June 30,
2021202020212020
(In millions)
Service cost$27 $24 $7 $7 
Interest cost40 47 12 14 
Expected return on plan assets(86)(83)(32)(32)
Amortization of:
Net actuarial loss49 43 4 3 
Prior service credit— — (5)(5)
Net periodic benefit cost (credit)$30 $31 $(14)$(13)
Pension BenefitsOther Postretirement Benefits
Six Months Ended June 30,
2021202020212020
(In millions)
Service cost$54 $49 $15 $13 
Interest cost79 93 23 28 
Expected return on plan assets(170)(166)(64)(64)
Amortization of:
Net actuarial loss98 86 7 8 
Prior service credit— — (10)(10)
Net periodic benefit cost (credit)$61 $62 $(29)$(25)
DTE Electric participates in various plans that provide pension and other postretirement benefits for DTE Energy and its affiliates. The plans are primarily sponsored by DTE Energy's subsidiary, DTE Energy Corporate Services, LLC. DTE Electric accounts for its participation in DTE Energy's qualified and non-qualified pension plans by applying multiemployer accounting. DTE Electric accounts for its participation in other postretirement benefit plans by applying multiple-employer accounting. Within multiemployer and multiple-employer plans, participants pool plan assets for investment purposes and to reduce the cost of plan administration. The primary difference between plan types is assets contributed in multiemployer plans can be used to provide benefits for all participating employers, while assets contributed within a multiple-employer plan are restricted for use by the contributing employer. As a result of multiemployer accounting treatment, capitalized costs associated with these plans are reflected in Property, plant, and equipment in DTE Electric's Consolidated Statements of Financial Position. The same capitalized costs are reflected as Regulatory assets and liabilities in DTE Energy's Consolidated Statements of Financial Position. In addition, the service cost and non-service cost components are presented in Operation and maintenance in DTE Electric's Consolidated Statements of Operations. The same non-service cost components are presented in Other (Income) and Deductions — Non-operating retirement benefits, net in DTE Energy's Consolidated Statements of Operations. Plan participants of all plans are solely DTE Energy and affiliate participants.
DTE Energy's subsidiaries are responsible for their share of qualified and non-qualified pension benefit costs. DTE Electric's allocated portion of pension benefit costs included in capital expenditures and operating and maintenance expense was $26 million and $25 million for the three months ended June 30, 2021 and 2020, respectively, and $52 million and $51 million for the six months ended June 30, 2021 and 2020, respectively. These amounts include recognized contractual termination benefit charges, curtailment gains, and settlement charges.
The following tables detail the components of net periodic benefit costs (credits) for other postretirement benefits for DTE Electric:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Service cost$5 $5 $11 $10 
Interest cost9 10 17 21 
Expected return on plan assets(21)(22)(43)(44)
Amortization of:
Net actuarial loss3 3 6 6 
Prior service credit(4)(3)(7)(7)
Net periodic benefit credit$(8)$(7)$(16)$(14)
Pension and Other Postretirement Contributions
At the discretion of management and depending upon financial market conditions, DTE Energy anticipates making up to $107 million in contributions to the qualified pension plans in 2021, including up to $100 million of contributions to the qualified pension plans at DTE Electric. No contributions are anticipated for DTE Energy's postretirement benefit plans in 2021.
v3.21.2
Segment and Related Information
 6 Months Ended
Jun. 30, 2021
Segment Reporting [Abstract]  
Segment and Related Information SEGMENT AND RELATED INFORMATION
DTE Energy sets strategic goals, allocates resources, and evaluates performance based on the following structure:
Electric segment consists principally of DTE Electric, which is engaged in the generation, purchase, distribution, and sale of electricity to approximately 2.2 million residential, commercial, and industrial customers in southeastern Michigan.
Gas segment consists principally of DTE Gas, which is engaged in the purchase, storage, transportation, distribution, and sale of natural gas to approximately 1.3 million residential, commercial, and industrial customers throughout Michigan and the sale of storage and transportation capacity.
Gas Storage and Pipelines is primarily engaged in services related to the gathering, transportation, and storage of natural gas.
Power and Industrial Projects is comprised primarily of projects that deliver energy and utility-type products and services to industrial, commercial, and institutional customers, produce reduced emissions fuel, and sell electricity and pipeline-quality gas from renewable energy projects.
Energy Trading consists of energy marketing and trading operations.
Corporate and Other includes various holding company activities, holds certain non-utility debt, and holds certain investments, including funds supporting regional development and economic growth.
The segment information included herein includes the results of DT Midstream, which is comprised of the Gas Storage and Pipelines segment and also certain DTE Energy holding company activity within the Corporate and Other segment. DTE Energy completed the separation of DT Midstream on July 1, 2021 and will have no further activity related to DT Midstream. Beginning in the third quarter 2021, historical results of the Gas Storage and Pipelines segment and DT Midstream activity within the Corporate and Other segment will be presented as discontinued operations. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information.
The federal income tax provisions or benefits of DTE Energy’s subsidiaries are determined on an individual company basis and recognize the tax benefit of tax credits and net operating losses, if applicable. The state and local income tax provisions of the utility subsidiaries are also determined on an individual company basis and recognize the tax benefit of various tax credits and net operating losses, if applicable. The subsidiaries record federal, state, and local income taxes payable to or receivable from DTE Energy based on the federal, state, and local tax provisions of each company.
Inter-segment billing for goods and services exchanged between segments is based upon tariffed or market-based prices of the provider and primarily consists of the sale of reduced emissions fuel, power sales, natural gas sales, and renewable natural gas sales in the following segments:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Electric$15 $15 $31 $30 
Gas3 4 7 8 
Gas Storage and Pipelines9 5 14 9 
Power and Industrial Projects176 80 338 174 
Energy Trading13 8 26 14 
Corporate and Other— — 1 1 
$216 $112 $417 $236 
Financial data of DTE Energy's business segments follows:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Operating Revenues — Utility operations
Electric$1,408 $1,309 $2,768 $2,521 
Gas265 251 877 791 
Operating Revenues — Non-utility operations
Electric3 3 7 7 
Gas Storage and Pipelines208 172 405 342 
Power and Industrial Projects394 219 760 526 
Energy Trading1,167 740 2,606 1,653 
Corporate and Other— 1 1 1 
Reconciliation and Eliminations(216)(112)(417)(236)
Total$3,229 $2,583 $7,007 $5,605 
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Net Income (Loss) Attributable to DTE Energy by Segment:
Electric$238 $183 $446 $277 
Gas7 1 176 122 
Gas Storage and Pipelines64 70 143 142 
Power and Industrial Projects14 25 42 55 
Energy Trading(66)(1)(121)33 
Corporate and Other(78)(1)(110)(12)
Net Income Attributable to DTE Energy Company$179 $277 $576 $617 
v3.21.2
Significant Accounting Policies (Policies)
 6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]  
Basis of Presentation
Basis of Presentation
The Consolidated Financial Statements should be read in conjunction with the Combined Notes to Consolidated Financial Statements included in the combined DTE Energy and DTE Electric 2020 Annual Report on Form 10-K.
The accompanying Consolidated Financial Statements of the Registrants are prepared using accounting principles generally accepted in the United States of America. These accounting principles require management to use estimates and assumptions that impact reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ from the Registrants' estimates.
The Consolidated Financial Statements are unaudited but, in the Registrants' opinions, include all adjustments necessary to present a fair statement of the results for the interim periods. All adjustments are of a normal recurring nature, except as otherwise disclosed in these Consolidated Financial Statements and Combined Notes to Consolidated Financial Statements. Financial results for this interim period are not necessarily indicative of results that may be expected for any other interim period or for the fiscal year ending December 31, 2021.
The information in these combined notes relates to each of the Registrants as noted in the Index of Combined Notes to Consolidated Financial Statements. However, DTE Electric does not make any representation as to information related solely to DTE Energy or the subsidiaries of DTE Energy other than itself.
On July 1, 2021, DTE Energy completed the previously announced separation of its natural gas pipeline, storage and gathering non-utility business. Effective with the separation, DTE retains no ownership in the new company, DT Midstream. The Consolidated Financial Statements and Combined Notes to Consolidated Financial Statements included herein are prior to the separation and all results as of and for the period ended June 30, 2021 include that of DT Midstream. Historical results of DT Midstream, which is primarily comprised of the Gas Storage and Pipelines segment and also includes certain DTE Energy holding company activity within the Corporate and Other segment, will be presented as discontinued operations beginning in the third quarter 2021. Any impacts to DTE Energy tax attributes will also be reflected in the third quarter financial statements. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information.
Principles of Consolidation
Principles of Consolidation
The Registrants consolidate all majority-owned subsidiaries and investments in entities in which they have controlling influence. Non-majority owned investments are accounted for using the equity method when the Registrants are able to significantly influence the operating policies of the investee. When the Registrants do not influence the operating policies of an investee, the equity investment is valued at cost minus any impairments, if applicable. These Consolidated Financial Statements also reflect the Registrants' proportionate interests in certain jointly-owned utility plants. The Registrants eliminate all intercompany balances and transactions.
The Registrants evaluate whether an entity is a VIE whenever reconsideration events occur. The Registrants consolidate VIEs for which they are the primary beneficiary. If a Registrant is not the primary beneficiary and an ownership interest is held, the VIE is accounted for under the equity method of accounting. When assessing the determination of the primary beneficiary, a Registrant considers all relevant facts and circumstances, including: the power, through voting or similar rights, to direct the activities of the VIE that most significantly impact the VIE's economic performance and the obligation to absorb the expected losses and/or the right to receive the expected returns of the VIE. The Registrants perform ongoing reassessments of all VIEs to determine if the primary beneficiary status has changed.
Legal entities within DTE Energy's Power and Industrial Projects segment enter into long-term contractual arrangements with customers to supply energy-related products or services. The entities are generally designed to pass-through the commodity risk associated with these contracts to the customers, with DTE Energy retaining operational and customer default risk. These entities generally are VIEs and consolidated when DTE Energy is the primary beneficiary. In addition, DTE Energy has interests in certain VIEs through which control of all significant activities is shared with partners, and therefore are generally accounted for under the equity method.
Through June 30, 2021, DTE Energy owned an 85% interest in SGG, which owns and operates midstream natural gas assets. SGG has contracts through which certain construction risk was designed to pass-through to the customers, with DTE Energy retaining operational and customer default risk. SGG is a VIE with DTE Energy as the primary beneficiary.
The Registrants have variable interests in NEXUS, which include DTE Energy's 50% ownership interest through DT Midstream and DTE Electric's transportation services contract. NEXUS is a joint venture which owns a 256-mile pipeline to transport Utica and Marcellus shale gas to Ohio, Michigan, and Ontario market centers. NEXUS also owns Generation Pipeline, LLC, a 25-mile regulated pipeline system located in northern Ohio. NEXUS is a VIE as it has insufficient equity at risk to finance its activities. The Registrants are not the primary beneficiaries, as the power to direct significant activities is shared between the owners of the equity interests. DTE Energy accounts for its ownership interest in NEXUS under the equity method.
The Registrants hold ownership interests in certain limited partnerships. The limited partnerships include investment funds which support regional development and economic growth, and an operational business providing energy-related products. These entities are generally VIEs as a result of certain characteristics of the limited partnership voting rights. The ownership interests are accounted for under the equity method as the Registrants are not the primary beneficiaries.
DTE Energy has variable interests in VIEs through certain of its long-term purchase and sale contracts. DTE Electric has variable interests in VIEs through certain of its long-term purchase contracts, including the transportation services contract with NEXUS. As of June 30, 2021, the carrying amount of assets and liabilities in DTE Energy's Consolidated Statements of Financial Position that relate to its variable interests under long-term purchase and sale contracts are predominantly related to working capital accounts and generally represent the amounts owed by or to DTE Energy for the deliveries associated with the current billing cycle under the contracts. As of June 30, 2021, the carrying amount of assets and liabilities in DTE Electric's Consolidated Statements of Financial Position that relate to its variable interests under long-term purchase contracts are predominantly related to working capital accounts and generally represent the amounts owed by DTE Electric for the deliveries associated with the current billing cycle under the contracts. The Registrants have not provided any significant form of financial support associated with these long-term contracts. There is no material potential exposure to loss as a result of DTE Energy's variable interests through these long-term purchase and sale contracts. In addition, there is no material potential exposure to loss as a result of DTE Electric's variable interests through these long-term purchase contracts.
The maximum risk exposure for consolidated VIEs is reflected on the Registrants' Consolidated Statements of Financial Position and, for DTE Energy, in Note 13 to the Consolidated Financial Statements, "Commitments and Contingencies," related to REF guarantees and indemnities. For non-consolidated VIEs, the maximum risk exposure of the Registrants is generally limited to their investment, notes receivable, future funding commitments, and amounts which DTE Energy has guaranteed.
Changes in Accumulated Other Comprehensive Income (Loss)
Changes in Accumulated Other Comprehensive Income (Loss)
Comprehensive income (loss) is the change in common shareholders' equity during a period from transactions and events from non-owner sources, including Net Income. The amounts recorded to Accumulated other comprehensive income (loss) for DTE Energy include changes in benefit obligations, consisting of deferred actuarial losses and prior service costs, unrealized gains and losses from derivatives accounted for as cash flow hedges, and foreign currency translation adjustments. DTE Energy releases income tax effects from accumulated other comprehensive income when the circumstances upon which they are premised cease to exist.
Changes in Accumulated other comprehensive income (loss) are presented in DTE Energy's Consolidated Statements of Changes in Equity and DTE Electric's Consolidated Statements of Changes in Shareholder's Equity.
Cash, Cash Equivalents, and Restricted Cash
Cash, Cash Equivalents, and Restricted Cash
Cash and cash equivalents include cash on hand, cash in banks, and temporary investments purchased with remaining maturities of three months or less. Restricted cash consists of funds held in separate bank accounts to satisfy contractual obligations and guarantee performance. Restricted cash designated for payments within one year is classified as a Current Asset.
Financing Receivables
Financing Receivables
Financing receivables are primarily composed of trade receivables, notes receivable, and unbilled revenue. The Registrants' financing receivables are stated at net realizable value.
The Registrants monitor the credit quality of their financing receivables on a regular basis by reviewing credit quality indicators and monitoring for trigger events, such as a credit rating downgrade or bankruptcy. Credit quality indicators include, but are not limited to, ratings by credit agencies where available, collection history, collateral, counterparty financial statements and other internal metrics. Utilizing such data, the Registrants have determined three internal grades of credit quality. Internal grade 1 includes financing receivables for counterparties where credit rating agencies have ranked the counterparty as investment grade. To the extent credit ratings are not available, the Registrants utilize other credit quality indicators to determine the level of risk associated with the financing receivable. Internal grade 1 may include financing receivables for counterparties for which credit rating agencies have ranked the counterparty as below investment grade; however, due to favorable information on other credit quality indicators, the Registrants have determined the risk level to be similar to that of an investment grade counterparty. Internal grade 2 includes financing receivables for counterparties with limited credit information and those with a higher risk profile based upon credit quality indicators. Internal grade 3 reflects financing receivables for which the counterparties have the greatest level of risk, including those in bankruptcy status.
The following represents the Registrants' financing receivables by year of origination, classified by internal grade of credit risk. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through June 30, 2021.
DTE EnergyDTE Electric
Year of origination
202120202019 and PriorTotal2021 and Prior
(In millions)
Notes receivable
Internal grade 1$— $— $24 $24 $14 
Internal grade 21 86 22 109 2 
Internal grade 3— — 11 11 — 
Total notes receivable(a)
$1 $86 $57 $144 $16 
Net investment in leases
Net investment in leases, internal grade 1$— $3 $39 $42 $— 
Net investment in leases, internal grade 2— 160 1 161 — 
Total net investment in leases(a)
$— $163 $40 $203 $— 
_______________________________________
(a)For DTE Energy, included in Current Assets — Other and Other Assets — Notes Receivable on the Consolidated Statements of Financial Position. For DTE Electric, included in Current Assets — Other and Other Assets — Other on the Consolidated Statements of Financial Position.
The allowance for doubtful accounts on accounts receivable for the utility entities is generally calculated using an aging approach that utilizes rates developed in reserve studies. DTE Electric and DTE Gas establish an allowance for uncollectible accounts based on historical losses and management's assessment of existing and future economic conditions, customer trends and other factors. Customer accounts are generally considered delinquent if the amount billed is not received by the due date, which is typically in 21 days, however, factors such as assistance programs may delay aggressive action. DTE Electric and DTE Gas generally assess late payment fees on trade receivables based on past-due terms with customers. Customer accounts are written off when collection efforts have been exhausted. The time period for write-off is 150 days after service has been terminated.
The customer allowance for doubtful accounts for non-utility businesses and other receivables for both utility and non-utility businesses is generally calculated based on specific review of probable future collections based on receivable balances generally in excess of 30 days. Existing and future economic conditions, customer trends and other factors are also considered. Receivables are written off on a specific identification basis and determined based upon the specific circumstances of the associated receivable.
Notes receivable for DTE Energy are primarily comprised of finance lease receivables and loans that are included in Notes Receivable and Other current assets on DTE Energy's Consolidated Statements of Financial Position. Notes receivable for DTE Electric are primarily comprised of loans.
Notes receivable are typically considered delinquent when payment is not received for periods ranging from 60 to 120 days. The Registrants cease accruing interest (nonaccrual status), consider a note receivable impaired, and establish an allowance for credit loss when it is probable that all principal and interest amounts due will not be collected in accordance with the contractual terms of the note receivable. In determining the allowance for credit losses for notes receivable, the Registrants consider the historical payment experience and other factors that are expected to have a specific impact on the counterparty's ability to pay including existing and future economic conditions.
DTE Energy's Gas Storage & Pipelines segment has an investment in certain assets in the Utica shale region which is accounted for as a note receivable. In the second quarter 2021, DTE Energy assessed the note receivable for impairment due to a reduction in forecasted volumes to be produced by the assets. As a result of fair value analysis, DTE Energy recorded a $19 million impairment of the note receivable, which is included in Asset (gains) losses and impairments, net on DTE Energy's Consolidated Statements of Operations for the three and six months ended June 30, 2021. Additionally, DTE Energy ceased accruing interest on the note receivable and reclassified the note to an Internal grade 3 receivable. There is no further risk of impairment to DTE Energy as the note receivable will transfer to DT Midstream upon its separation on July 1, 2021.
DTE Energy has off balance sheet exposure in the form of a revolving credit facility. Refer to Note 13, "Commitments and Contingencies," for additional information. In determining the level of credit reserve needed, DTE considers the likelihood of funding in addition to the other factors noted above. A reserve may be established when it is likely that funding will occur. Cash payments received on nonaccrual status notes receivable, that do not bring the account contractually current, are first applied to the contractually owed past due interest, with any remainder applied to principal. Accrual of interest is generally resumed when the note receivable becomes contractually current.
Recently Adopted and Recently Issued Pronouncements
Recently Adopted Pronouncements
In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes. The amendments in this update simplify the accounting for income taxes by removing certain exceptions, and clarifying certain requirements regarding franchise taxes, goodwill, consolidated tax expenses, and annual effective tax rate calculations. The Registrants adopted the ASU effective January 1, 2021 using the modified retrospective and prospective approaches, where applicable. The adoption of the ASU did not have a significant impact on the Registrants' Consolidated Financial Statements.
In August 2020, the FASB issued ASU No. 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity. The amendments in this update simplify the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts indexed to and potentially settled in an entity's own equity. The Registrants adopted the ASU effective January 1, 2021 using the modified retrospective approach. The adoption of the ASU did not have a significant impact on the Registrants' Consolidated Financial Statements.
Recently Issued Pronouncements
In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting, as amended. The amendments in this update provide optional expedients and exceptions for applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued. The guidance can be applied prospectively from any date beginning March 12, 2020 through December 31, 2022. The optional relief is temporary and cannot be applied to contract modifications and hedging relationships entered into or evaluated after December 31, 2022. The Registrants presently have various contracts that reference LIBOR and are assessing how this standard may be applied to specific contract modifications.
In July 2021, the FASB issued ASU No. 2021-05, Leases (Topic 842): Lessors – Certain Leases with Variable Lease Payments. The amendments in this update modify lease classification requirements for lessors, providing that lease contracts with variable lease payments that do not depend on a reference index or a rate should be classified as operating leases if they would have been classified as a sales-type or direct financing lease and resulted in the recognition of a selling loss at lease commencement. The ASU is effective for the Registrants for fiscal years beginning after December 15, 2021, and interim periods therein. Early adoption is permitted. The Registrants are currently assessing the impact of this standard on their Consolidated Financial Statements.
Fair Value Measurement
Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in a principal or most advantageous market. Fair value is a market-based measurement that is determined based on inputs, which refer broadly to assumptions that market participants use in pricing assets or liabilities. These inputs can be readily observable, market corroborated, or generally unobservable inputs. The Registrants make certain assumptions they believe that market participants would use in pricing assets or liabilities, including assumptions about risk, and the risks inherent in the inputs to valuation techniques. Credit risk of the Registrants and their counterparties is incorporated in the valuation of assets and liabilities through the use of credit reserves, the impact of which was immaterial at June 30, 2021 and December 31, 2020. The Registrants believe they use valuation techniques that maximize the use of observable market-based inputs and minimize the use of unobservable inputs.
A fair value hierarchy has been established that prioritizes the inputs to valuation techniques used to measure fair value in three broad levels. The fair value hierarchy gives the highest priority to quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). In some cases, the inputs used to measure fair value might fall in different levels of the fair value hierarchy. All assets and liabilities are required to be classified in their entirety based on the lowest level of input that is significant to the fair value measurement in its entirety. Assessing the significance of a particular input may require judgment considering factors specific to the asset or liability and may affect the valuation of the asset or liability and its placement within the fair value hierarchy. The Registrants classify fair value balances based on the fair value hierarchy defined as follows:
•Level 1 — Consists of unadjusted quoted prices in active markets for identical assets or liabilities that the Registrants have the ability to access as of the reporting date.
•Level 2 — Consists of inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data.
•Level 3 — Consists of unobservable inputs for assets or liabilities whose fair value is estimated based on internally developed models or methodologies using inputs that are generally less readily observable and supported by little, if any, market activity at the measurement date. Unobservable inputs are developed based on the best available information and subject to cost-benefit constraints.
Nuclear Decommissioning Trusts and Other Investments
Nuclear Decommissioning Trusts and Other Investments
The nuclear decommissioning trusts and other investments hold debt and equity securities directly and indirectly through commingled funds. Exchange-traded debt and equity securities held directly, as well as publicly-traded commingled funds, are valued using quoted market prices in actively traded markets. Non-exchange traded fixed income securities are valued based upon quotations available from brokers or pricing services.
Non-publicly traded commingled funds holding exchange-traded equity or debt securities are valued based on stated NAVs. There are no significant restrictions for these funds and investments may be redeemed with 7 to 65 days notice depending on the fund. There is no intention to sell the investment in these commingled funds.
Private equity and other assets include a diversified group of funds that are classified as NAV assets. These funds primarily invest in limited partnerships, including private equity, private real estate and private credit. Distributions are received through the liquidation of the underlying fund assets over the life of the funds. There are generally no redemption rights. The limited partner must hold the fund for its life or find a third-party buyer, which may need to be approved by the general partner. The funds are established with varied contractual durations generally in the range of 7 years to 12 years. The fund life can often be extended by several years by the general partner, and further extended with the approval of the limited partners. Unfunded commitments related to these investments totaled $159 million and $183 million as of June 30, 2021 and December 31, 2020, respectively.
For pricing the nuclear decommissioning trusts and other investments, a primary price source is identified by asset type, class, or issue for each security. The trustee monitors prices supplied by pricing services and may use a supplemental price source or change the primary source of a given security if the trustee determines that another price source is considered preferable. The Registrants have obtained an understanding of how these prices are derived, including the nature and observability of the inputs used in deriving such prices.
Derivative Assets and Liabilities
Derivative Assets and Liabilities
Derivative assets and liabilities are comprised of physical and financial derivative contracts, including futures, forwards, options, and swaps that are both exchange-traded and over-the-counter traded contracts. Various inputs are used to value derivatives depending on the type of contract and availability of market data. Exchange-traded derivative contracts are valued using quoted prices in active markets. The Registrants consider the following criteria in determining whether a market is considered active: frequency in which pricing information is updated, variability in pricing between sources or over time, and the availability of public information. Other derivative contracts are valued based upon a variety of inputs including commodity market prices, broker quotes, interest rates, credit ratings, default rates, market-based seasonality, and basis differential factors. The Registrants monitor the prices that are supplied by brokers and pricing services and may use a supplemental price source or change the primary price source of an index if prices become unavailable or another price source is determined to be more representative of fair value. The Registrants have obtained an understanding of how these prices are derived. Additionally, the Registrants selectively corroborate the fair value of their transactions by comparison of market-based price sources. Mathematical valuation models are used for derivatives for which external market data is not readily observable, such as contracts which extend beyond the actively traded reporting period. The Registrants have established a Risk Management Committee whose responsibilities include directly or indirectly ensuring all valuation methods are applied in accordance with predefined policies. The development and maintenance of the Registrants' forward price curves has been assigned to DTE Energy's Risk Management Department, which is separate and distinct from the trading functions within DTE Energy.
Fair Value Transfer Derivatives are transferred between levels primarily due to changes in the source data used to construct price curves as a result of changes in market liquidity. Transfers in and transfers out are reflected as if they had occurred at the beginning of the period.
Derivatives
The Registrants recognize all derivatives at their fair value as Derivative assets or liabilities on their respective Consolidated Statements of Financial Position unless they qualify for certain scope exceptions, including the normal purchases and normal sales exception. Further, derivatives that qualify and are designated for hedge accounting are classified as either hedges of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (cash flow hedge); or as hedges of the fair value of a recognized asset or liability or of an unrecognized firm commitment (fair value hedge). For cash flow hedges, the derivative gain or loss is deferred in Accumulated other comprehensive income (loss) and later reclassified into earnings when the underlying transaction occurs. For fair value hedges, changes in fair values for the derivative and hedged item are recognized in earnings each period. For derivatives that do not qualify or are not designated for hedge accounting, changes in fair value are recognized in earnings each period.
The Registrants' primary market risk exposure is associated with commodity prices, credit, and interest rates. The Registrants have risk management policies to monitor and manage market risks. The Registrants use derivative instruments to manage some of the exposure. DTE Energy uses derivative instruments for trading purposes in its Energy Trading segment. Contracts classified as derivative instruments include electricity, natural gas, oil, certain environmental contracts, forwards, futures, options, swaps, and foreign currency exchange contracts. Items not classified as derivatives include natural gas and environmental inventory, pipeline transportation contracts, certain environmental contracts, and natural gas storage assets.
DTE Electric — DTE Electric generates, purchases, distributes, and sells electricity. DTE Electric uses forward contracts to manage changes in the price of electricity and fuel. Substantially all of these contracts meet the normal purchases and normal sales exception and are therefore accounted for under the accrual method. Other derivative contracts are MTM and recoverable through the PSCR mechanism when settled. This results in the deferral of unrealized gains and losses as Regulatory assets or liabilities until realized.
DTE Gas — DTE Gas purchases, stores, transports, distributes, and sells natural gas, and buys and sells transportation and storage capacity. DTE Gas has fixed-priced contracts for portions of its expected natural gas supply requirements through March 2024. Substantially all of these contracts meet the normal purchases and normal sales exception and are therefore accounted for under the accrual method. Forward transportation and storage contracts are generally not derivatives and are therefore accounted for under the accrual method.
Gas Storage and Pipelines — This segment has been primarily engaged in services related to the gathering, transportation, and storage of natural gas. Primarily fixed-priced contracts have been used in the marketing and management of transportation and storage services. Generally, these contracts were not derivatives and were therefore accounted for under the accrual method. These contracts will not be retained by DTE Energy following the separation of DT Midstream on July 1, 2021.
Power and Industrial Projects — This segment manages and operates energy and pulverized coal projects, a coke battery, reduced emissions fuel projects, renewable gas recovery, and power generation assets. Primarily fixed-price contracts are used in the marketing and management of the segment assets. These contracts are generally not derivatives and are therefore accounted for under the accrual method.
Energy Trading — Commodity Price Risk — Energy Trading markets and trades electricity, natural gas physical products, and energy financial instruments, and provides energy and asset management services utilizing energy commodity derivative instruments. Forwards, futures, options, and swap agreements are used to manage exposure to the risk of market price and volume fluctuations in its operations. These derivatives are accounted for by recording changes in fair value to earnings unless hedge accounting criteria are met.
Energy Trading — Foreign Currency Exchange Risk — Energy Trading has foreign currency exchange forward contracts to economically hedge fixed Canadian dollar commitments existing under natural gas and power purchase and sale contracts and natural gas transportation contracts. Energy Trading enters into these contracts to mitigate price volatility with respect to fluctuations of the Canadian dollar relative to the U.S. dollar. These derivatives are accounted for by recording changes in fair value to earnings unless hedge accounting criteria are met.
Corporate and Other — Interest Rate Risk — DTE Energy may use interest rate swaps, treasury locks, and other derivatives to hedge the risk associated with interest rate market volatility.
Credit Risk — DTE Energy maintains credit policies that significantly minimize overall credit risk. These policies include an evaluation of potential customers’ and counterparties’ financial condition, including the viability of underlying productive assets, credit rating, collateral requirements, or other credit enhancements such as letters of credit or guarantees. DTE Energy generally uses standardized agreements that allow the netting of positive and negative transactions associated with a single counterparty. DTE Energy maintains a provision for credit losses based on factors surrounding the credit risk of its customers, historical trends, and other information. Based on DTE Energy's credit policies and its June 30, 2021 provision for credit losses, DTE Energy’s exposure to counterparty nonperformance is not expected to have a material adverse effect on DTE Energy's Consolidated Financial Statements.
Derivatives, Offsetting Fair Value Amounts
Certain of DTE Energy's derivative positions are subject to netting arrangements which provide for offsetting of asset and liability positions as well as related cash collateral. Such netting arrangements generally do not have restrictions. Under such netting arrangements, DTE Energy offsets the fair value of derivative instruments with cash collateral received or paid for those contracts executed with the same counterparty, which reduces DTE Energy's Total Assets and Liabilities. Cash collateral is allocated between the fair value of derivative instruments and customer accounts receivable and payable with the same counterparty on a pro-rata basis to the extent there is exposure. Any cash collateral remaining, after the exposure is netted to zero, is reflected in Accounts receivable and Accounts payable as collateral paid or received, respectively.
DTE Energy also provides and receives collateral in the form of letters of credit which can be offset against net Derivative assets and liabilities as well as Accounts receivable and payable. DTE Energy had issued letters of credit of $11 million and $7 million outstanding at June 30, 2021 and December 31, 2020, respectively, which could be used to offset net Derivative liabilities. Letters of credit received from third parties which could be used to offset net Derivative assets were $34 million and $9 million at June 30, 2021 and December 31, 2020, respectively. Such balances of letters of credit are excluded from the tables below and are not netted with the recognized assets and liabilities in DTE Energy's Consolidated Statements of Financial Position.
For contracts with certain clearing agents, the fair value of derivative instruments is netted against realized positions with the net balance reflected as either 1) a Derivative asset or liability or 2) an Account receivable or payable. Other than certain clearing agents, Accounts receivable and Accounts payable that are subject to netting arrangements have not been offset against the fair value of Derivative assets and liabilities.
Derivatives, Methods of Accounting Revenues and energy costs related to trading contracts are presented on a net basis in DTE Energy's Consolidated Statements of Operations. Commodity derivatives used for trading purposes, and financial non-trading commodity derivatives, are accounted for using the MTM method with unrealized and realized gains and losses recorded in Operating Revenues — Non-utility operations. Non-trading physical commodity sale and purchase derivative contracts are generally accounted for using the MTM method with unrealized and realized gains and losses for sales recorded in Operating Revenues — Non-utility operations and purchases recorded in Fuel, purchased power, gas, and other — non-utility.
Income Tax The federal income tax provisions or benefits of DTE Energy’s subsidiaries are determined on an individual company basis and recognize the tax benefit of tax credits and net operating losses, if applicable. The state and local income tax provisions of the utility subsidiaries are also determined on an individual company basis and recognize the tax benefit of various tax credits and net operating losses, if applicable. The subsidiaries record federal, state, and local income taxes payable to or receivable from DTE Energy based on the federal, state, and local tax provisions of each company.
v3.21.2
Organization and Basis of Presentation (Tables)
 6 Months Ended
Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Variable Interest Entities
The following table summarizes the major Consolidated Statements of Financial Position items for consolidated VIEs as of June 30, 2021 and December 31, 2020. All assets and liabilities of a consolidated VIE are presented where it has been determined that a consolidated VIE has either (1) assets that can be used only to settle obligations of the VIE or (2) liabilities for which creditors do not have recourse to the general credit of the primary beneficiary. VIEs, in which DTE Energy holds a majority voting interest and is the primary beneficiary, that meet the definition of a business and whose assets can be used for purposes other than the settlement of the VIE's obligations have been excluded from the table below.
Amounts for DTE Energy's consolidated VIEs are as follows:
June 30, 2021December 31, 2020
SGG(a)
OtherTotal
SGG(a)
OtherTotal
(In millions)
ASSETS
Cash and cash equivalents$27 $22 $49 $34 $20 $54 
Accounts receivable9 24 33 8 28 36 
Inventories— 46 46 — 107 107 
Property, plant, and equipment, net398 17 415 402 23 425 
Goodwill25 — 25 25 — 25 
Intangible assets520 — 520 527 — 527 
Notes receivable and other2 60 62 2 33 35 
$981 $169 $1,150 $998 $211 $1,209 
LIABILITIES
Accounts payable$1 $22 $23 $— $22 $22 
Short-term borrowings— 69 69 — 38 38 
Other current and long-term liabilities7 2 9 7 4 11 
$8 $93 $101 $7 $64 $71 
_____________________________________
(a)Amounts shown are 100% of SGG's assets and liabilities, of which DTE Energy owned 85% at June 30, 2021 and December 31, 2020.
Summary of Amounts for Non-Consolidated Variable Interest Entities
Amounts for DTE Energy's non-consolidated VIEs are as follows:
June 30, 2021December 31, 2020
(In millions)
Investments in equity method investees$1,503 $1,507 
Notes receivable$29 $47 
Future funding commitments$22 $26 
v3.21.2
Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]  
Schedule of Other Income
The following is a summary of DTE Energy's Other income:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Equity earnings of equity method investees$41 $30 $73 $59 
Income from REF entities21 29 45 52 
Contract services7 6 15 13 
Allowance for equity funds used during construction6 7 13 13 
Gains from rabbi trust securities(a)
2 22 4 22 
Other6 7 9 7 
$83 $101 $159 $166 
_______________________________________
(a)Losses from rabbi trust securities are recorded separately to Other expenses on the Consolidated Statements of Operations.
The following is a summary of DTE Electric's Other income:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Contract services$7 $6 $15 $13 
Allowance for equity funds used during construction6 6 12 12 
Gains from rabbi trust securities allocated from DTE Energy(a)
2 22 4 22 
Other4 3 7 3 
$19 $37 $38 $50 
_______________________________________
(a)Losses from rabbi trust securities are recorded separately to Other expenses on the Consolidated Statements of Operations.
Schedule of Effective Tax Rates
The interim effective tax rates of the Registrants are as follows:
Effective Tax Rate
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
DTE Energy11 %2 %8 %8 %
DTE Electric10 %12 %10 %12 %
Schedule of Financing Receivables Classified by Internal Grade of Credit Risk
The following represents the Registrants' financing receivables by year of origination, classified by internal grade of credit risk. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through June 30, 2021.
DTE EnergyDTE Electric
Year of origination
202120202019 and PriorTotal2021 and Prior
(In millions)
Notes receivable
Internal grade 1$— $— $24 $24 $14 
Internal grade 21 86 22 109 2 
Internal grade 3— — 11 11 — 
Total notes receivable(a)
$1 $86 $57 $144 $16 
Net investment in leases
Net investment in leases, internal grade 1$— $3 $39 $42 $— 
Net investment in leases, internal grade 2— 160 1 161 — 
Total net investment in leases(a)
$— $163 $40 $203 $— 
_______________________________________
(a)For DTE Energy, included in Current Assets — Other and Other Assets — Notes Receivable on the Consolidated Statements of Financial Position. For DTE Electric, included in Current Assets — Other and Other Assets — Other on the Consolidated Statements of Financial Position.
Schedule of Roll-Forward of Activity for Financing Receivables Credit Loss Reserves
The following tables present a roll-forward of the activity for the Registrants' financing receivables credit loss reserves:
DTE EnergyDTE Electric
Trade accounts receivableOther receivablesTotalTrade and other accounts receivable
(In millions)
Beginning reserve balance, January 1, 2021$101 $3 $104 $57 
Current period provision 33 1 34 17 
Write-offs charged against allowance(60)(1)(61)(40)
Recoveries of amounts previously written off38 — 38 22 
Ending reserve balance, June 30, 2021$112 $3 $115 $56 

DTE EnergyDTE Electric
Trade accounts receivableOther receivablesTotalTrade and other accounts receivable
(In millions)
Beginning reserve balance, January 1, 2020$87 $4 $91 $46 
Current period provision100 3 103 61 
Write-offs charged against allowance(136)(4)(140)(80)
Recoveries of amounts previously written off50 — 50 30 
Ending reserve balance, December 31, 2020$101 $3 $104 $57 
Schedule of Uncollectible Expense
Uncollectible expense for the Registrants is primarily comprised of the current period provision for allowance for doubtful accounts and is summarized as follows:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
DTE Energy$4 $15 $35 $48 
DTE Electric5 9 16 26 
v3.21.2
Revenue (Tables)
 6 Months Ended
Jun. 30, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following is a summary of revenues disaggregated by segment for DTE Energy:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Electric(a)
Residential$705 $671 $1,377 $1,269 
Commercial468 389 920 815 
Industrial147 120 306 276 
Other(b)
91 132 172 168 
Total Electric operating revenues(c)
$1,411 $1,312 $2,775 $2,528 
Gas
Gas sales$171 $169 $631 $563 
End User Transportation48 43 133 120 
Intermediate Transportation17 16 43 42 
Other(b)
29 23 70 66 
Total Gas operating revenues(d)
$265 $251 $877 $791 
Other segment operating revenues
Gas Storage and Pipelines(e)
$208 $172 $405 $342 
Power and Industrial Projects(f)
$394 $219 $760 $526 
Energy Trading(g)
$1,167 $740 $2,606 $1,653 
_______________________________________
(a)Revenues generally represent those of DTE Electric, except $3 million of Other revenues related to DTE Sustainable Generation for the three months ended June 30, 2021 and 2020 and $7 million for the six months ended June 30, 2021 and 2020.
(b)Includes revenue adjustments related to various regulatory mechanisms.
(c)Includes $5 million of Other revenues outside the scope of Topic 606 for the three months ended June 30, 2021 and 2020, and $8 million and $10 million for the six months ended June 30, 2021 and 2020, respectively.
(d)Includes $2 million and $3 million of Other revenues outside the scope of Topic 606 for the three months ended June 30, 2021 and 2020, respectively, and $4 million and $5 million for the six months ended June 30, 2021 and 2020, respectively. Revenues also include $2 million under Alternative Revenue Programs outside the scope of Topic 606 for the six months ended June 30, 2020.
(e)Includes revenues outside the scope of Topic 606 primarily related to $2 million of contracts accounted for as leases for the three months ended June 30, 2021 and 2020, and $4 million for the six months ended June 30, 2021 and 2020.
(f)Includes revenues outside the scope of Topic 606 primarily related to $22 million and $21 million of contracts accounted for as leases for the three months ended June 30, 2021 and 2020, respectively, and $44 million and $48 million for the six months ended June 30, 2021 and 2020, respectively.
(g)Includes revenues outside the scope of Topic 606 primarily related to $907 million and $467 million of derivatives for the three months ended June 30, 2021 and 2020, respectively, and $2.1 billion and $1.1 billion of derivatives for the six months ended June 30, 2021 and 2020, respectively.
Summary of Deferred Revenue Activity
The following is a summary of deferred revenue activity:
DTE Energy
(In millions)
Beginning Balance, January 1, 2021$87 
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period46 
Revenue recognized that was included in the deferred revenue balance at the beginning of the period(19)
Ending Balance, June 30, 2021$114 
Deferred Revenue Amounts Expected to be Recognized as Revenue in Future Periods
The following table represents deferred revenue amounts for DTE Energy that are expected to be recognized as revenue in future periods:
DTE Energy
(In millions)
2021$69 
202222 
20234 
20243 
20257 
2026 and thereafter9 
$114 
The Registrants expect to recognize revenue for the following amounts related to fixed consideration associated with remaining performance obligations in each of the future periods noted:
DTE EnergyDTE Electric
(In millions)
2021$142 $4 
2022382 7 
2023324 7 
2024209 7 
2025130 1 
2026 and thereafter535 — 
$1,722 $26 
v3.21.2
Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following is a reconciliation of DTE Energy's basic and diluted income per share calculation:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions, except per share amounts)
Basic Earnings per Share
Net Income Attributable to DTE Energy Company$179 $277 $576 $617 
Less: Allocation of earnings to net restricted stock awards1 — 1 1 
Net income available to common shareholders — basic$178 $277 $575 $616 
Average number of common shares outstanding — basic193 192 193 192 
Basic Earnings per Common Share$0.92 $1.44 $2.97 $3.20 
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company$179 $277 $576 $617 
Less: Allocation of earnings to net restricted stock awards1 — 1 1 
Net income available to common shareholders — diluted$178 $277 $575 $616 
Average number of common shares outstanding — basic193 192 193 192 
Average dilutive equity units, performance share awards, and stock options1 1 1 — 
Average number of common shares outstanding — diluted194 193 194 192 
Diluted Earnings per Common Share(a)
$0.92 $1.44 $2.97 $3.20 
_______________________________________
(a)Equity Units excluded from the calculation of diluted EPS were approximately 9.5 million and 10.3 million for the three months ended June 30, 2021 and 2020, respectively, and 10.0 million and 10.3 million for the six months ended June 30, 2021 and 2020, respectively, as the dilutive stock price threshold was not met.
v3.21.2
Fair Value (Tables)
 6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
The following table presents assets and liabilities for DTE Energy measured and recorded at fair value on a recurring basis:
June 30, 2021December 31, 2020
Level
1		Level
2		Level
3
Other(a)
Netting(b)
Net BalanceLevel
1		Level
2		Level
3
Other(a)
Netting(b)
Net Balance
(In millions)
Assets
Cash equivalents(c)
$3,325 $— $— $— $— $3,325 $438 $— $— $— $— $438 
Nuclear decommissioning trusts
Equity securities952 — — 216 — 1,168 947 — — 222 — 1,169 
Fixed income securities134 425 — 99 — 658 102 371 — 82 — 555 
Private equity and other— — — 159 — 159 — — — 104 — 104 
Cash equivalents34 — — — — 34 27 — — — — 27 
Other investments(d)
Equity securities62 — — — — 62 55 — — — — 55 
Fixed income securities7 — — — — 7 8 — — — — 8 
Cash equivalents86 — — — — 86 97 — — — — 97 
Derivative assets
Commodity contracts(e)
Natural gas180 110 46 — (289)47 99 74 60 — (156)77 
Electricity— 255 75 — (192)138 — 128 52 — (120)60 
Environmental & Other1 359 15 — (339)36 — 150 4 — (135)19 
Total derivative assets181 724 136 — (820)221 99 352 116 — (411)156 
Total$4,781 $1,149 $136 $474 $(820)$5,720 $1,773 $723 $116 $408 $(411)$2,609 
Liabilities
Derivative liabilities
Commodity contracts(e)
Natural gas$(131)$(170)$(227)$— $289 $(239)$(88)$(59)$(76)$— $151 $(72)
Electricity— (201)(124)— 192 (133)— (126)(42)— 125 (43)
Environmental & Other— (356)— — 339 (17)— (137)— — 129 (8)
Foreign currency exchange contracts— (7)— — — (7)— (5)— — (5)
Total$(131)$(734)$(351)$— $820 $(396)$(88)$(327)$(118)$— $405 $(128)
Net Assets (Liabilities) at end of period$4,650 $415 $(215)$474 $— $5,324 $1,685 $396 $(2)$408 $(6)$2,481 
Assets
Current$3,480 $530 $109 $— $(623)$3,496 $532 $260 $92 $— $(330)$554 
Noncurrent1,301 619 27 474 (197)2,224 1,241 463 24 408 (81)2,055 
Total Assets$4,781 $1,149 $136 $474 $(820)$5,720 $1,773 $723 $116 $408 $(411)$2,609 
Liabilities
Current$(124)$(511)$(220)$— $623 $(232)$(84)$(223)$(79)$— $318 $(68)
Noncurrent(7)(223)(131)— 197 (164)(4)(104)(39)— 87 (60)
Total Liabilities$(131)$(734)$(351)$— $820 $(396)$(88)$(327)$(118)$— $405 $(128)
Net Assets (Liabilities) at end of period$4,650 $415 $(215)$474 $— $5,324 $1,685 $396 $(2)$408 $(6)$2,481 
_______________________________________
(a)Amounts represent assets valued at NAV as a practical expedient for fair value.
(b)Amounts represent the impact of master netting agreements that allow DTE Energy to net gain and loss positions and cash collateral held or placed with the same counterparties.
(c)Amounts consisted of $1 million and $2 million of cash equivalents included in Restricted cash on DTE Energy's Consolidated Statements of Financial Position at June 30, 2021 and December 31, 2020, respectively. All other amounts are included in Cash and cash equivalents on the Consolidated Statements of Financial Position.
(d)Excludes cash surrender value of life insurance investments.
(e)For contracts with a clearing agent, DTE Energy nets all activity across commodities. This can result in some individual commodities having a contra balance.
The following table presents assets for DTE Electric measured and recorded at fair value on a recurring basis as of:
June 30, 2021December 31, 2020
Level 1Level 2Level 3
Other(a)
Net BalanceLevel 1Level 2Level 3
Other(a)
Net Balance
(In millions)
Assets
Cash equivalents$— $— $— $— $— $4 $— $— $— $4 
Nuclear decommissioning trusts
Equity securities952 — — 216 1,168 947 — — 222 1,169 
Fixed income securities134 425 — 99 658 102 371 — 82 555 
Private equity and other— — — 159 159 — — — 104 104 
Cash equivalents34 — — — 34 27 — — — 27 
Other investments
Equity securities18 — — — 18 16 — — — 16 
Cash equivalents11 — — — 11 11 — — — 11 
Derivative assets — FTRs— — 15 — 15 — — 4 — 4 
Total$1,149 $425 $15 $474 $2,063 $1,107 $371 $4 $408 $1,890 
Assets
Current$— $— $15 $— $15 $4 $— $4 $— $8 
Noncurrent1,149 425 — 474 2,048 1,103 371 — 408 1,882 
Total Assets$1,149 $425 $15 $474 $2,063 $1,107 $371 $4 $408 $1,890 
_______________________________________
(a)Amounts represent assets valued at NAV as a practical expedient for fair value.
Reconciliation of Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis
The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for DTE Energy:
Three Months Ended June 30, 2021Three Months Ended June 30, 2020
Natural GasElectricityOtherTotalNatural GasElectricityOtherTotal
(In millions)
Net Assets (Liabilities) as of March 31$(89)$(19)$1 $(107)$8 $15 $1 $24 
Transfers into Level 3 from Level 2— — — — 2 — — 2 
Transfers from Level 3 into Level 2— — — — (5)— — (5)
Total gains (losses)
Included in earnings(a)
(128)(9)— (137)12 33 (8)37 
Recorded in Regulatory liabilities— — 16 16 — — 14 14 
Purchases, issuances, and settlements
Settlements36 (21)(2)13 3 (32)3 (26)
Net Assets (Liabilities) as of June 30$(181)$(49)$15 $(215)$20 $16 $10 $46 
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30(a)
$(98)$(18)$(15)$(131)$18 $20 $(16)$22 
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30$— $— $15 $15 $— $— $10 $10 
_______________________________________
(a)Amounts are reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, gas, and other — non-utility in DTE Energy's Consolidated Statements of Operations.
Six Months Ended June 30, 2021Six Months Ended June 30, 2020
Natural GasElectricityOtherTotalNatural GasElectricityOtherTotal
(In millions)
Net Assets (Liabilities) as of December 31$(16)$10 $4 $(2)$(15)$16 $3 $4 
Transfers from Level 3 into Level 2— — — — (4)— — (4)
Total gains (losses)
Included in earnings(a)
(195)16 — (179)36 53 (8)81 
Recorded in Regulatory liabilities— — 15 15 — — 12 12 
Purchases, issuances, and settlements
Settlements30 (75)(4)(49)3 (53)3 (47)
Net Assets (Liabilities) as of June 30$(181)$(49)$15 $(215)$20 $16 $10 $46 
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30(a)
$(192)$(24)$(15)$(231)$37 $42 $(16)$63 
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30$— $— $15 $15 $— $— $10 $10 
_______________________________________
(a)Amounts are reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, gas, and other — non-utility in DTE Energy's Consolidated Statements of Operations.
The following table presents the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for DTE Electric:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Net Assets as of beginning of period$1 $1 $4 $3 
Change in fair value recorded in Regulatory liabilities16 14 15 12 
Purchases, issuances, and settlements
Settlements(2)(5)(4)(5)
Net Assets as of June 30$15 $10 $15 $10 
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at June 30$15 $10 $15 $10 
Unobservable Inputs Related to Level 3 Assets and Liabilities
The following tables present the unobservable inputs related to DTE Energy's Level 3 assets and liabilities:
June 30, 2021
Commodity ContractsDerivative AssetsDerivative LiabilitiesValuation TechniquesUnobservable InputRangeWeighted Average
(In millions)
Natural Gas$46 $(227)Discounted Cash FlowForward basis price (per MMBtu)$(1.41)—$2.47 /MMBtu$(0.09)/MMBtu
Electricity$75 $(124)Discounted Cash FlowForward basis price (per MWh)$(12)—$5 /MWh$(1)/MWh
December 31, 2020
Commodity ContractsDerivative AssetsDerivative LiabilitiesValuation TechniquesUnobservable InputRangeWeighted Average
(In millions)
Natural Gas$60 $(76)Discounted Cash FlowForward basis price (per MMBtu)$(0.86)—$2.50 /MMBtu$(0.07)/MMBtu
Electricity$52 $(42)Discounted Cash FlowForward basis price (per MWh)$(9)—$6 /MWh$— /MWh
Carrying Amount of Fair Value of Financial Instruments
The following table presents the carrying amount and fair value of financial instruments for DTE Energy:
June 30, 2021December 31, 2020
CarryingFair ValueCarryingFair Value
AmountLevel 1Level 2Level 3AmountLevel 1Level 2Level 3
(In millions)
Notes receivable(a), excluding lessor finance leases
$144 $— $— $144 $141 $— $— $141 
Short-term borrowings$69 $— $69 $— $38 $— $38 $— 
Notes payable(b)
$5 $— $— $5 $19 $— $— $19 
Long-term debt(c)
$22,909 $2,236 $21,728 $1,115 $19,439 $2,547 $18,230 $1,397 
_______________________________________
(a)Current portion included in Current Assets — Other on DTE Energy's Consolidated Statements of Financial Position.
(b)Included in Current Liabilities — Other and Other Liabilities — Other on DTE Energy's Consolidated Statements of Financial Position.
(c)Includes debt due within one year and excludes finance lease obligations. Carrying value also includes unamortized debt discounts and issuance costs.
The following table presents the carrying amount and fair value of financial instruments for DTE Electric:
June 30, 2021December 31, 2020
CarryingFair ValueCarryingFair Value
AmountLevel 1Level 2Level 3AmountLevel 1Level 2Level 3
(In millions)
Notes receivable(a)
$16 $— $— $16 $16 $— $— $16 
Short-term borrowings — affiliates$194 $— $— $194 $101 $— $— $101 
Notes payable(b)
$4 $— $— $4 $17 $— $— $17 
Long-term debt(c)
$8,943 $— $10,112 $150 $8,236 $— $9,579 $379 
_______________________________________
(a)Included in Current Assets — Other and Other Assets — Other on DTE Electric's Consolidated Statements of Financial Position.
(b)Included in Current Liabilities — Other and Other Liabilities — Other on DTE Electric's Consolidated Statements of Financial Position.
(c)Includes debt due within one year and excludes finance lease obligations. Carrying value also includes unamortized debt discounts and issuance costs.
Fair Value of Nuclear Decommissioning Trust Fund Assets
The following table summarizes DTE Electric's fair value of the nuclear decommissioning trust fund assets:
June 30, 2021December 31, 2020
(In millions)
Fermi 2$2,002 $1,841 
Fermi 13 3 
Low-level radioactive waste14 11 
$2,019 $1,855 
Schedule of Realized Gains and Losses and Proceeds from Sale of Securities by Nuclear Decommissioning Trust Funds The following table sets forth DTE Electric's gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Realized gains$35 $103 $59 $134 
Realized losses$(6)$(76)$(8)$(92)
Proceeds from sale of securities$366 $799 $637 $1,238 
Fair Value and Unrealized Gains and Losses for Nuclear Decommissioning Trust Funds
The following table sets forth DTE Electric's fair value and unrealized gains and losses for the nuclear decommissioning trust funds:
June 30, 2021December 31, 2020
Fair
Value		Unrealized
Gains		Unrealized
Losses		Fair
Value		Unrealized
Gains		Unrealized
Losses
(In millions)
Equity securities$1,168 $546 $(4)$1,169 $481 $(6)
Fixed income securities658 24 (3)555 20 (1)
Private equity and other159 26 — 104 — — 
Cash equivalents34 — — 27 — — 
$2,019 $596 $(7)$1,855 $501 $(7)
Fair Value of the Fixed Income Securities Held in Nuclear Decommissioning Trust Funds
The following table summarizes the fair value of the fixed income securities held in nuclear decommissioning trust funds by contractual maturity:
June 30, 2021
(In millions)
Due within one year$7 
Due after one through five years151 
Due after five through ten years113 
Due after ten years288 
$559 
Summary of Gains (Losses) Related to the Trust The following table summarizes the Registrant's gains (losses) related to the trust:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Gains (losses) related to equity securities$2 $16 $4 $(6)
Gains (losses) related to fixed income securities— 6 — (3)
$2 $22 $4 $(9)
v3.21.2
Financial and Other Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair Value of Derivative Instruments
The following table presents the fair value of derivative instruments for DTE Energy:
June 30, 2021December 31, 2020
Derivative
Assets		Derivative LiabilitiesDerivative
Assets		Derivative Liabilities
(In millions)
Derivatives designated as hedging instruments
Foreign currency exchange contracts$— $(4)$— $(4)
Derivatives not designated as hedging instruments
Commodity contracts
Natural gas$336 $(528)$233 $(223)
Electricity330 (325)180 (168)
Environmental & Other375 (356)154 (137)
Foreign currency exchange contracts— (3)— (1)
Total derivatives not designated as hedging instruments$1,041 $(1,212)$567 $(529)
Current$794 $(855)$446 $(386)
Noncurrent247 (361)121 (147)
Total derivatives$1,041 $(1,216)$567 $(533)
The following table presents the fair value of derivative instruments for DTE Electric:
June 30, 2021December 31, 2020
(In millions)
FTRs — Other current assets$15 $4 
Total derivatives not designated as hedging instruments$15 $4 
Offsetting Assets
The following table presents net cash collateral offsetting arrangements for DTE Energy:
June 30, 2021December 31, 2020
(In millions)
Cash collateral netted against Derivative assets$— $(12)
Cash collateral netted against Derivative liabilities— 6 
Cash collateral recorded in Accounts receivable(a)
23 14 
Cash collateral recorded in Accounts payable(a)
(1)(1)
Total net cash collateral posted (received)$22 $7 
_______________________________________
(a)Amounts are recorded net by counterparty.
The following table presents the netting offsets of Derivative assets and liabilities for DTE Energy:
June 30, 2021December 31, 2020
Gross Amounts of Recognized Assets (Liabilities)Gross Amounts Offset in the Consolidated Statements of Financial PositionNet Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial PositionGross Amounts of Recognized Assets (Liabilities)Gross Amounts Offset in the Consolidated Statements of Financial PositionNet Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position
(In millions)
Derivative assets
Commodity contracts
Natural gas$336 $(289)$47 $233 $(156)$77 
Electricity330 (192)138 180 (120)60 
Environmental & Other375 (339)36 154 (135)19 
Total derivative assets$1,041 $(820)$221 $567 $(411)$156 
Derivative liabilities
Commodity contracts
Natural gas$(528)$289 $(239)$(223)$151 $(72)
Electricity(325)192 (133)(168)125 (43)
Environmental & Other(356)339 (17)(137)129 (8)
Foreign currency exchange contracts(7)— (7)(5)— (5)
Total derivative liabilities$(1,216)$820 $(396)$(533)$405 $(128)
Offsetting Liabilities
The following table presents net cash collateral offsetting arrangements for DTE Energy:
June 30, 2021December 31, 2020
(In millions)
Cash collateral netted against Derivative assets$— $(12)
Cash collateral netted against Derivative liabilities— 6 
Cash collateral recorded in Accounts receivable(a)
23 14 
Cash collateral recorded in Accounts payable(a)
(1)(1)
Total net cash collateral posted (received)$22 $7 
_______________________________________
(a)Amounts are recorded net by counterparty.
The following table presents the netting offsets of Derivative assets and liabilities for DTE Energy:
June 30, 2021December 31, 2020
Gross Amounts of Recognized Assets (Liabilities)Gross Amounts Offset in the Consolidated Statements of Financial PositionNet Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial PositionGross Amounts of Recognized Assets (Liabilities)Gross Amounts Offset in the Consolidated Statements of Financial PositionNet Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position
(In millions)
Derivative assets
Commodity contracts
Natural gas$336 $(289)$47 $233 $(156)$77 
Electricity330 (192)138 180 (120)60 
Environmental & Other375 (339)36 154 (135)19 
Total derivative assets$1,041 $(820)$221 $567 $(411)$156 
Derivative liabilities
Commodity contracts
Natural gas$(528)$289 $(239)$(223)$151 $(72)
Electricity(325)192 (133)(168)125 (43)
Environmental & Other(356)339 (17)(137)129 (8)
Foreign currency exchange contracts(7)— (7)(5)— (5)
Total derivative liabilities$(1,216)$820 $(396)$(533)$405 $(128)
Netting Offsets of Derivative Assets and Liabilities Reconciliation to the Statements of Financial Position
The following table presents the netting offsets of Derivative assets and liabilities showing the reconciliation of derivative instruments to DTE Energy's Consolidated Statements of Financial Position:
June 30, 2021December 31, 2020
Derivative AssetsDerivative LiabilitiesDerivative AssetsDerivative Liabilities
CurrentNoncurrentCurrentNoncurrentCurrentNoncurrentCurrentNoncurrent
(In millions)
Total fair value of derivatives$794 $247 $(855)$(361)$446 $121 $(386)$(147)
Counterparty netting(623)(197)623 197 (318)(81)318 81 
Collateral adjustment— — — — (12)— — 6 
Total derivatives as reported$171 $50 $(232)$(164)$116 $40 $(68)$(60)
Gain (Loss) Recognized in Income on Derivatives
The effect of derivatives not designated as hedging instruments on DTE Energy's Consolidated Statements of Operations is as follows:
Location of Gain (Loss) Recognized in Income on DerivativesGain (Loss) Recognized in Income on Derivatives for the Three Months Ended June 30,Gain (Loss) Recognized in Income on Derivatives for the Six Months Ended June 30,
2021202020212020
(In millions)
Commodity contracts
Natural gasOperating Revenues — Non-utility operations$(114)$(25)$(157)$(36)
Natural gasFuel, purchased power, gas, and other — non-utility(24)43 (79)79 
ElectricityOperating Revenues — Non-utility operations42 41 75 42 
Environmental & OtherOperating Revenues — Non-utility operations(7)(63)(39)(41)
Foreign currency exchange contractsOperating Revenues — Non-utility operations(1)(3)(3)2 
Total$(104)$(7)$(203)$46 
Volume of Commodity Contracts
The following represents the cumulative gross volume of DTE Energy's derivative contracts outstanding as of June 30, 2021:
CommodityNumber of Units
Natural gas (MMBtu)1,839,526,884 
Electricity (MWh)33,751,897 
Foreign currency exchange ($ CAD)121,659,867 
Renewable Energy Certificates (MWh)11,051,843 
Carbon emissions (Metric Tons)28,873,477 
v3.21.2
Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Debt Issuances
In 2021, the following debt was issued:
CompanyMonthTypeInterest RateMaturity DateAmount
(In millions)
DTE ElectricMarch
Mortgage bonds(a)
1.90%2028$575 
DTE ElectricMarch
Mortgage bonds(a)
3.25%2051425 
DT MidstreamJune
Senior notes(b)
4.125%20291,100 
DT MidstreamJune
Senior notes(b)
4.375%20311,000 
DT MidstreamJune
Term loan facility(b)
Variable(c)
20281,000 
$4,100 
_______________________________________
(a)Bonds were issued as Green Bonds and the proceeds will be used to finance qualified expenditures for solar and wind energy, payments under power purchase agreements for solar and wind energy, and energy optimization programs.
(b)Proceeds were used for the repayment of short-term borrowings due to DTE Energy to facilitate the separation of DT Midstream, as well as a one-time special dividend provided to DTE Energy. The debt will remain with DT Midstream following its separation on July 1, 2021. Refer to Note 4 to the Consolidated Financial Statements, “Dispositions and Impairments,” for additional information and to the Debt Redemptions section below for DTE Energy's use of the proceeds received from DT Midstream.
(c)Variable rate is LIBOR plus 2.00%, where LIBOR will not be less than 0.50%. The term loan facility includes $900 million with a six-month LIBOR interest period and $100 million with a three-month LIBOR interest period.
Schedule of Debt Redemptions
Through June 2021, the following debt was redeemed:
CompanyMonthTypeInterest RateMaturity DateAmount
(In millions)
DTE ElectricAprilMortgage bonds3.90%2021$250 
DTE ElectricMayMortgage bonds7.00%202133 
DTE EnergyJune
Junior subordinated debentures(a)
5.375%2076300 
$583 
_______________________________________
(a)Early redemption resulted in a loss on extinguishment of debt of $8 million relating to the write-off of unamortized issuance costs. The loss was recorded to Other expenses on DTE Energy's Consolidated Statements of Operations for the three and six months ended June 30, 2021.
In July 2021, DTE Energy used proceeds from DT Midstream’s repayment of short-term borrowings and one-time special dividend to optionally redeem $2.2 billion of additional long-term debt, including the following:
CompanyMonthTypeInterest RateMaturity DateAmount
(In millions)
DTE EnergyJulySenior notes3.30%2022$300 
DTE EnergyJulySenior notes2.60%2022300 
DTE EnergyJulySenior notes3.70%2023600 
DTE EnergyJulySenior notes3.85%2023135 
DTE EnergyJulySenior notes3.50%2024350 
DTE EnergyJulySenior notes3.80%2027350 
DTE EnergyJulySenior notes3.40%202921 
DTE EnergyJulySenior notes6.375%2033191 
$2,247 
v3.21.2
Short-Term Credit Arrangements and Borrowings (Tables)
 6 Months Ended
Jun. 30, 2021
Short-term Debt [Abstract]  
Schedule of Line of Credit Facilities
The availability under these facilities as of June 30, 2021 is shown in the following table:
DTE EnergyDTE ElectricDTE GasTotal
(In millions)
Unsecured revolving credit facility, expiring April 2025(a)
$1,500 $500 $300 $2,300 
Unsecured Canadian revolving credit facility, expiring May 202389 — — 89 
Secured revolving credit facility, expiring June 2026(b)
33 — — 33 
Unsecured letter of credit facility, expiring in February 2023150 — — 150 
Unsecured letter of credit facility, expiring in August 2021110 — — 110 
Unsecured letter of credit facility(c)
50 — — 50 
1,932 500 300 2,732 
Amounts outstanding at June 30, 2021
Revolver borrowings69 — — 69 
Letters of credit230 — — 230 
299 — — 299 
Net availability at June 30, 2021$1,633 $500 $300 $2,433 
_______________________________________
(a)Total availability of $102 million expires in April 2024, including $67 million at DTE Energy, $22 million at DTE Electric, and $13 million at DTE Gas. All other availability expires in April 2025.
(b)For DT Midstream $750 million revolving credit facility, availability shown is limited to $33 million available to DTE Energy
(c)Uncommitted letter of credit facility with automatic renewal provision for each July and therefore no expiration.
v3.21.2
Leases (Tables)
 6 Months Ended
Jun. 30, 2021
Leases [Abstract]  
Components of Net Investment in Finance Leases
The components of DTE Energy’s net investment in finance leases for remaining periods were as follows:
DTE Energy
June 30, 2021
(In millions)
2021$13 
202222 
202321 
202422 
202522 
2026 and Thereafter292 
Total minimum future lease receipts392 
Residual value of leased pipeline17 
Less unearned income206 
Net investment in finance lease203 
Less current portion8 
$195 
Schedule of Lease Income Associated with Operating Leases
DTE Energy’s lease income associated with operating leases, including the line items in which it was included on the Consolidated Statements of Operations, was as follows:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Fixed payments$16 $17 $33 $33 
Variable payments18 16 35 39 
34 33 68 72 
Operating revenues24 23 48 52 
Other income10 10 20 20 
$34 $33 $68 $72 
v3.21.2
Retirement Benefits and Trusteed Assets (Tables)
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Costs (Credits)
The following tables detail the components of net periodic benefit costs (credits) for pension benefits and other postretirement benefits for DTE Energy:
Pension BenefitsOther Postretirement Benefits
Three Months Ended June 30,
2021202020212020
(In millions)
Service cost$27 $24 $7 $7 
Interest cost40 47 12 14 
Expected return on plan assets(86)(83)(32)(32)
Amortization of:
Net actuarial loss49 43 4 3 
Prior service credit— — (5)(5)
Net periodic benefit cost (credit)$30 $31 $(14)$(13)
Pension BenefitsOther Postretirement Benefits
Six Months Ended June 30,
2021202020212020
(In millions)
Service cost$54 $49 $15 $13 
Interest cost79 93 23 28 
Expected return on plan assets(170)(166)(64)(64)
Amortization of:
Net actuarial loss98 86 7 8 
Prior service credit— — (10)(10)
Net periodic benefit cost (credit)$61 $62 $(29)$(25)
The following tables detail the components of net periodic benefit costs (credits) for other postretirement benefits for DTE Electric:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Service cost$5 $5 $11 $10 
Interest cost9 10 17 21 
Expected return on plan assets(21)(22)(43)(44)
Amortization of:
Net actuarial loss3 3 6 6 
Prior service credit(4)(3)(7)(7)
Net periodic benefit credit$(8)$(7)$(16)$(14)
v3.21.2
Segment and Related Information (Tables)
 6 Months Ended
Jun. 30, 2021
Segment Reporting [Abstract]  
Financial Data of Business Segments
Inter-segment billing for goods and services exchanged between segments is based upon tariffed or market-based prices of the provider and primarily consists of the sale of reduced emissions fuel, power sales, natural gas sales, and renewable natural gas sales in the following segments:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Electric$15 $15 $31 $30 
Gas3 4 7 8 
Gas Storage and Pipelines9 5 14 9 
Power and Industrial Projects176 80 338 174 
Energy Trading13 8 26 14 
Corporate and Other— — 1 1 
$216 $112 $417 $236 
Financial data of DTE Energy's business segments follows:
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Operating Revenues — Utility operations
Electric$1,408 $1,309 $2,768 $2,521 
Gas265 251 877 791 
Operating Revenues — Non-utility operations
Electric3 3 7 7 
Gas Storage and Pipelines208 172 405 342 
Power and Industrial Projects394 219 760 526 
Energy Trading1,167 740 2,606 1,653 
Corporate and Other— 1 1 1 
Reconciliation and Eliminations(216)(112)(417)(236)
Total$3,229 $2,583 $7,007 $5,605 
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
(In millions)
Net Income (Loss) Attributable to DTE Energy by Segment:
Electric$238 $183 $446 $277 
Gas7 1 176 122 
Gas Storage and Pipelines64 70 143 142 
Power and Industrial Projects14 25 42 55 
Energy Trading(66)(1)(121)33 
Corporate and Other(78)(1)(110)(12)
Net Income Attributable to DTE Energy Company$179 $277 $576 $617 
v3.21.2
Organization and Basis of Presentation (Details Textuals)
customer in Millions, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
customer
Dec. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Number of electric utility customers | customer 2.2  
Number of gas utility customers | customer 1.3  
Material potential exposure | $ $ 0  
DTE Electric    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Material potential exposure | $ $ 0  
NEXUS pipeline    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Ownership interest 50.00%  
SGG    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
VIE ownership percentage 85.00% 85.00%
v3.21.2
Organization and Basis of Presentation (Consolidated Variable Interest Entities) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
ASSETS    
Cash and cash equivalents $ 3,448 $ 514
Accounts receivable 1,550 1,665
Property, plant, and equipment, net 29,140 27,969
Goodwill 2,466 2,466
Total Assets 49,636 45,496
LIABILITIES    
Accounts payable 1,173 1,029
Short-term borrowings 69 38
Total    
ASSETS    
Cash and cash equivalents 49 54
Accounts receivable 33 36
Inventories 46 107
Property, plant, and equipment, net 415 425
Goodwill 25 25
Intangible assets 520 527
Notes receivable and other 62 35
Total Assets 1,150 1,209
LIABILITIES    
Accounts payable 23 22
Short-term borrowings 69 38
Other current and long-term liabilities 9 11
Total liabilities 101 71
SGG    
ASSETS    
Cash and cash equivalents 27 34
Accounts receivable 9 8
Inventories 0 0
Property, plant, and equipment, net 398 402
Goodwill 25 25
Intangible assets 520 527
Notes receivable and other 2 2
Total Assets 981 998
LIABILITIES    
Accounts payable 1 0
Short-term borrowings 0 0
Other current and long-term liabilities 7 7
Total liabilities $ 8 $ 7
VIE ownership and non-ownership percentage 100.00%  
VIE ownership percentage 85.00% 85.00%
Other    
ASSETS    
Cash and cash equivalents $ 22 $ 20
Accounts receivable 24 28
Inventories 46 107
Property, plant, and equipment, net 17 23
Goodwill 0 0
Intangible assets 0 0
Notes receivable and other 60 33
Total Assets 169 211
LIABILITIES    
Accounts payable 22 22
Short-term borrowings 69 38
Other current and long-term liabilities 2 4
Total liabilities $ 93 $ 64
v3.21.2
Organization and Basis of Presentation (Non-Consolidated Variable Interest Entities) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Investments in equity method investees $ 1,860 $ 1,868
Notes receivable 312 280
Variable interest entity, non-consolidated    
Variable Interest Entity [Line Items]    
Investments in equity method investees 1,503 1,507
Notes receivable 29 47
Future funding commitments $ 22 $ 26
v3.21.2
Significant Accounting Policies (Other Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Schedule of Other Nonoperating Income, by Component [Line Items]        
Equity earnings of equity method investees $ 41 $ 30 $ 73 $ 59
Income from REF entities 21 29 45 52
Contract services 7 6 15 13
Allowance for equity funds used during construction 6 7 13 13
Gains from rabbi trust securities 2 22 4 22
Other 6 7 9 7
Total other income 83 101 159 166
DTE Electric        
Schedule of Other Nonoperating Income, by Component [Line Items]        
Contract services 7 6 15 13
Allowance for equity funds used during construction 6 6 12 12
Gains from rabbi trust securities 2 22 4 22
Other 4 3 7 3
Total other income $ 19 $ 37 $ 38 $ 50
v3.21.2
Significant Accounting Policies (Income Taxes) (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Schedule of Income Taxes [Line Items]        
Effective Tax Rate 11.00% 2.00% 8.00% 8.00%
DTE Electric        
Schedule of Income Taxes [Line Items]        
Effective Tax Rate 10.00% 12.00% 10.00% 12.00%
v3.21.2
Significant Accounting Policies (Details Textuals) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Significant Accounting Policies [Line Items]          
Effective tax rate increase (decrease) 9.00%   0.00%    
Carryback of net operating losses due to CARES Act 12.00%   5.00%    
West Virginia tax law change 4.00%   1.00%    
Annual production tax credits 4.00%   3.00%    
Amortization of TCJA regulatory liability 3.00%   3.00%    
Unrecognized compensation cost $ 101   $ 101    
Recognition period (in years)     1 year 7 months 6 days    
Specific review of probable future collections based on receivable balances, threshold duration     30 days    
Notes receivable          
Significant Accounting Policies [Line Items]          
Financing receivables 144   $ 144    
Past due          
Significant Accounting Policies [Line Items]          
Financing receivables 0   0    
Gas Storage and Pipelines | Notes receivable          
Significant Accounting Policies [Line Items]          
Impairment of notes receivable $ 19   $ 19    
Minimum          
Significant Accounting Policies [Line Items]          
Notes receivable considered delinquent period     60 days    
Maximum          
Significant Accounting Policies [Line Items]          
Notes receivable considered delinquent period     120 days    
DTE Electric and DTE Gas          
Significant Accounting Policies [Line Items]          
Receivables due date     21 days    
Threshold period past due for write-off of trade accounts receivable     150 days    
DTE Electric          
Significant Accounting Policies [Line Items]          
Effective tax rate increase (decrease) (2.00%)   (2.00%)    
Annual production tax credits 1.00%   1.00%    
Amortization of TCJA regulatory liability 1.00%   1.00%    
DTE Electric | Notes receivable          
Significant Accounting Policies [Line Items]          
Financing receivables $ 16   $ 16    
DTE Electric | DTE Energy          
Significant Accounting Policies [Line Items]          
Income tax receivable 2   2   $ 8
Allocated costs $ 11 $ 7 $ 25 $ 16  
v3.21.2
Significant Accounting Policies (Financing Receivables Classified by Internal Grade of Credit Risk) (Details)
$ in Millions
Jun. 30, 2021
USD ($)
Notes receivable  
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 $ 1
2020 86
2019 and Prior 57
Total 144
Notes receivable | DTE Electric  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total 16
Notes receivable | Internal grade 1  
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 0
2020 0
2019 and Prior 24
Total 24
Notes receivable | Internal grade 1 | DTE Electric  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total 14
Notes receivable | Internal grade 2  
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 1
2020 86
2019 and Prior 22
Total 109
Notes receivable | Internal grade 2 | DTE Electric  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total 2
Notes receivable | Internal grade 3  
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 0
2020 0
2019 and Prior 11
Total 11
Notes receivable | Internal grade 3 | DTE Electric  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total 0
Net investment in leases  
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 0
2020 163
2019 and Prior 40
Total 203
Net investment in leases | DTE Electric  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total 0
Net investment in leases | Internal grade 1  
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 0
2020 3
2019 and Prior 39
Total 42
Net investment in leases | Internal grade 1 | DTE Electric  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total 0
Net investment in leases | Internal grade 2  
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 0
2020 160
2019 and Prior 1
Total 161
Net investment in leases | Internal grade 2 | DTE Electric  
Financing Receivable, Credit Quality Indicator [Line Items]  
Total $ 0
v3.21.2
Significant Accounting Policies (Roll-Forward of Activity for Financing Receivables Credit Loss Reserves) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 104 $ 91
Current period provision 34 103
Write-offs charged against allowance (61) (140)
Recoveries of amounts previously written off 38 50
Ending balance 115 104
DTE Electric    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 57 46
Current period provision 17 61
Write-offs charged against allowance (40) (80)
Recoveries of amounts previously written off 22 30
Ending balance 56 57
Trade accounts receivable    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 101 87
Current period provision 33 100
Write-offs charged against allowance (60) (136)
Recoveries of amounts previously written off 38 50
Ending balance 112 101
Other receivables    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 3 4
Current period provision 1 3
Write-offs charged against allowance (1) (4)
Recoveries of amounts previously written off 0 0
Ending balance $ 3 $ 3
v3.21.2
Significant Accounting Policies (Uncollectible Expense) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Uncollectible expense $ 4 $ 15 $ 35 $ 48
DTE Electric        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Uncollectible expense $ 5 $ 9 $ 16 $ 26
v3.21.2
Dispositions and Impairments (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 01, 2021
shares
Aug. 31, 2021
USD ($)
Jul. 27, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Long-term debt issued       $ 4,100,000,000 $ 4,100,000,000 $ 4,100,000,000  
Redemption of long-term debt           583,000,000 $ 300,000,000
Cumulative transaction costs incurred       43,000,000 43,000,000 43,000,000  
Transaction costs         24,000,000 34,000,000  
Power and Industrial Projects              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Impairment charge         27,000,000 27,000,000  
Power and Industrial Projects | Property, plant and equipment              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Impairment of long-lived assets held for use         18,000,000 18,000,000  
Power and Industrial Projects | Other noncurrent assets              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Impairment of long-lived assets held for use         9,000,000 9,000,000  
Subsequent Event              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Redemption of long-term debt     $ 2,247,000,000        
Subsequent Event | Maximum | DT Midstream | Discontinued operations, spinoff              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Transition Services Agreement period 24 months            
Subsequent Event | Forecast              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Redemption of long-term debt   $ 374,000,000          
DT Midstream              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Discount and debt issuance costs       53,000,000 53,000,000 53,000,000  
Cash payment for dividend to DTE Energy       501,000,000      
DT Midstream | Subsequent Event              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Distribution of shares (in shares) | shares 96,732,466            
Share distribution ratio 0.5            
DT Midstream | June 2021 Variable Rate Term Loan maturing in 2028              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Long-term debt issued       1,000,000,000 1,000,000,000 1,000,000,000  
DT Midstream | Senior Notes              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Long-term debt issued       2,100,000,000 $ 2,100,000,000 $ 2,100,000,000  
DT Midstream | Affiliates              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Cash payment for short-term borrowings due to DTE Energy       2,537,000,000      
Net cash payment for accounts receivable due from and accounts payable due to DTE Energy       $ 9,000,000      
v3.21.2
Revenue (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenues $ 3,229 $ 2,583 $ 7,007 $ 5,605
Lease revenue outside scope of Topic 606 34 33 68 72
Electric        
Disaggregation of Revenue [Line Items]        
Revenues 1,411 1,312 2,775 2,528
Other revenues outside scope of topic 606 5 5 8 10
Electric | Residential        
Disaggregation of Revenue [Line Items]        
Revenues 705 671 1,377 1,269
Electric | Commercial        
Disaggregation of Revenue [Line Items]        
Revenues 468 389 920 815
Electric | Industrial        
Disaggregation of Revenue [Line Items]        
Revenues 147 120 306 276
Electric | Other        
Disaggregation of Revenue [Line Items]        
Revenues 91 132 172 168
Electric | Other | DTE Sustainable Generation        
Disaggregation of Revenue [Line Items]        
Revenues 3 3 7 7
Gas        
Disaggregation of Revenue [Line Items]        
Revenues 265 251 877 791
Other revenues outside scope of topic 606 2 3 4 5
Alternative Revenue Program revenues outside scope of Topic 606       2
Gas | Other        
Disaggregation of Revenue [Line Items]        
Revenues 29 23 70 66
Gas | Gas sales        
Disaggregation of Revenue [Line Items]        
Revenues 171 169 631 563
Gas | End User Transportation        
Disaggregation of Revenue [Line Items]        
Revenues 48 43 133 120
Gas | Intermediate Transportation        
Disaggregation of Revenue [Line Items]        
Revenues 17 16 43 42
Gas Storage and Pipelines        
Disaggregation of Revenue [Line Items]        
Revenues 208 172 405 342
Lease revenue outside scope of Topic 606 2 2 4 4
Power and Industrial Projects        
Disaggregation of Revenue [Line Items]        
Revenues 394 219 760 526
Lease revenue outside scope of Topic 606 22 21 44 48
Energy Trading        
Disaggregation of Revenue [Line Items]        
Revenues 1,167 740 2,606 1,653
Gain on derivatives outside scope of Topic 606 $ 907 $ 467 $ 2,100 $ 1,100
v3.21.2
Revenue (Deferred Revenue) (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2021
USD ($)
Contract Liability [Roll Forward]  
Beginning Balance $ 87
Increases due to cash received or receivable, excluding amounts recognized as revenue during the period 46
Revenue recognized that was included in the deferred revenue balance at the beginning of the period (19)
Ending Balance $ 114
v3.21.2
Revenue (Expected Recognition of Deferred Revenue) (Details)
$ in Millions
Jun. 30, 2021
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 114
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 69
Remaining performance obligation, expected timing of satisfaction 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 22
Remaining performance obligation, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 4
Remaining performance obligation, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 3
Remaining performance obligation, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 7
Remaining performance obligation, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 9
Remaining performance obligation, expected timing of satisfaction
v3.21.2
Revenue (Expected Timing of Performance Obligation Satisfaction) (Details)
$ in Millions
Jun. 30, 2021
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 114
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 69
Remaining performance obligation, expected timing of satisfaction 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 22
Remaining performance obligation, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 4
Remaining performance obligation, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 3
Remaining performance obligation, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 7
Remaining performance obligation, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 9
Remaining performance obligation, expected timing of satisfaction
Fixed-price Contract  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 1,722
Fixed-price Contract | DTE Electric  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation 26
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 142
Remaining performance obligation, expected timing of satisfaction 6 months
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01 | DTE Electric  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 4
Remaining performance obligation, expected timing of satisfaction 6 months
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 382
Remaining performance obligation, expected timing of satisfaction 1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | DTE Electric  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 7
Remaining performance obligation, expected timing of satisfaction 1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 324
Remaining performance obligation, expected timing of satisfaction 1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01 | DTE Electric  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 7
Remaining performance obligation, expected timing of satisfaction 1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 209
Remaining performance obligation, expected timing of satisfaction 1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01 | DTE Electric  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 7
Remaining performance obligation, expected timing of satisfaction 1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 130
Remaining performance obligation, expected timing of satisfaction 1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | DTE Electric  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 1
Remaining performance obligation, expected timing of satisfaction 1 year
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 535
Remaining performance obligation, expected timing of satisfaction
Fixed-price Contract | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | DTE Electric  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation $ 0
Remaining performance obligation, expected timing of satisfaction
v3.21.2
Regulatory Matters (Details Textuals) - MPSC - USD ($)
$ in Millions
Feb. 12, 2021
Jun. 23, 2021
Mar. 26, 2021
Jul. 09, 2020
DTE Electric        
Public Utilities, General Disclosures [Line Items]        
Regulatory liability for non-plant-related accumulated deferred income tax balances that resulted from the TCJA, accelerated amortization approved       $ 102
Requested securitization of qualified costs     $ 184  
Authorized issuance of securitization bonds of qualified costs, maximum   $ 236    
DTE Gas | 2021 Gas Rate Case Filing        
Public Utilities, General Disclosures [Line Items]        
Requested rate increase $ 195      
Return on equity percent 9.90%      
Return on equity requested percent 10.25%      
v3.21.2
Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic Earnings per Share        
Net Income Attributable to DTE Energy Company $ 179 $ 277 $ 576 $ 617
Less: Allocation of earnings to net restricted stock awards 1 0 1 1
Net income available to common shareholders — basic $ 178 $ 277 $ 575 $ 616
Average number of common shares outstanding — basic (in shares) 193.0 192.0 193.0 192.0
Basic Earnings per Common Share (in dollars per share) $ 0.92 $ 1.44 $ 2.97 $ 3.20
Diluted Earnings per Share        
Net Income Attributable to DTE Energy Company $ 179 $ 277 $ 576 $ 617
Less: Allocation of earnings to net restricted stock awards 1 0 1 1
Net income available to common shareholders — diluted $ 178 $ 277 $ 575 $ 616
Average number of common shares outstanding — basic (in shares) 193.0 192.0 193.0 192.0
Average dilutive equity units, performance share awards, and stock options (in shares) 1.0 1.0 1.0 0.0
Average number of common shares outstanding — diluted (in shares) 194.0 193.0 194.0 192.0
Diluted Earnings per Common Share (in dollars per share) $ 0.92 $ 1.44 $ 2.97 $ 3.20
Antidilutive securities excluded from computation of earnings per share (in shares) 9.5 10.3 10.0 10.3
v3.21.2
Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivative assets    
Derivative assets, gross $ 1,041 $ 567
Derivative asset, netting (820) (411)
Derivative assets, net 221 156
Derivative liabilities    
Derivative liabilities, gross (1,216) (533)
Derivative liability, netting 820 405
Derivative liabilities, net (396) (128)
DTE Electric    
Assets    
Nuclear decommissioning trusts 2,019 1,855
Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (855) (386)
Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (361) (147)
Natural gas    
Derivative assets    
Derivative assets, gross 336 233
Derivative asset, netting (289) (156)
Derivative assets, net 47 77
Derivative liabilities    
Derivative liabilities, gross (528) (223)
Derivative liability, netting 289 151
Derivative liabilities, net (239) (72)
Electricity    
Derivative assets    
Derivative assets, gross 330 180
Derivative asset, netting (192) (120)
Derivative assets, net 138 60
Derivative liabilities    
Derivative liabilities, gross (325) (168)
Derivative liability, netting 192 125
Derivative liabilities, net (133) (43)
Environmental & Other    
Derivative assets    
Derivative assets, gross 375 154
Derivative asset, netting (339) (135)
Derivative assets, net 36 19
Derivative liabilities    
Derivative liabilities, gross (356) (137)
Derivative liability, netting 339 129
Derivative liabilities, net (17) (8)
Foreign currency exchange contracts    
Derivative liabilities    
Derivative liabilities, gross (7) (5)
Derivative liability, netting 0 0
Derivative liabilities, net (7) (5)
Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 34 27
Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 159 104
Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,168 1,169
Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 658 555
Recurring    
Assets    
Cash equivalents 3,325 438
Derivative assets    
Derivative asset, netting (820) (411)
Derivative assets, net 221 156
Total assets 5,720 2,609
Derivative liabilities    
Derivative liability, netting 820 405
Derivative liabilities, net (396) (128)
Net Assets (Liabilities) at end of period 5,324 2,481
Net Assets at end of period, netting 0 (6)
Recurring | DTE Electric    
Assets    
Cash equivalents 0 4
Derivative assets    
Total assets 2,063 1,890
Recurring | Current assets    
Derivative assets    
Derivative asset, netting (623) (330)
Total assets 3,496 554
Recurring | Current assets | DTE Electric    
Derivative assets    
Total assets 15 8
Recurring | Noncurrent assets    
Derivative assets    
Derivative asset, netting (197) (81)
Total assets 2,224 2,055
Recurring | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 2,048 1,882
Recurring | Current liabilities    
Derivative liabilities    
Derivative liability, netting 623 318
Derivative liabilities, net (232) (68)
Recurring | Noncurrent liabilities    
Derivative liabilities    
Derivative liability, netting 197 87
Derivative liabilities, net (164) (60)
Recurring | Restricted cash    
Assets    
Cash equivalents 1 2
Recurring | Natural gas    
Derivative assets    
Derivative asset, netting (289) (156)
Derivative assets, net 47 77
Derivative liabilities    
Derivative liability, netting 289 151
Derivative liabilities, net (239) (72)
Recurring | Electricity    
Derivative assets    
Derivative asset, netting (192) (120)
Derivative assets, net 138 60
Derivative liabilities    
Derivative liability, netting 192 125
Derivative liabilities, net (133) (43)
Recurring | Environmental & Other    
Derivative assets    
Derivative asset, netting (339) (135)
Derivative assets, net 36 19
Derivative liabilities    
Derivative liability, netting 339 129
Derivative liabilities, net (17) (8)
Recurring | Foreign currency exchange contracts    
Derivative liabilities    
Derivative liability, netting 0 0
Derivative liabilities, net (7) (5)
Recurring | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 15 4
Recurring | Cash equivalents    
Assets    
Nuclear decommissioning trusts 34 27
Other investments 86 97
Recurring | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 34 27
Other investments 11 11
Recurring | Private equity and other    
Assets    
Nuclear decommissioning trusts 159 104
Recurring | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 159 104
Recurring | Equity securities    
Assets    
Nuclear decommissioning trusts 1,168 1,169
Other investments 62 55
Recurring | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,168 1,169
Other investments 18 16
Recurring | Fixed income securities    
Assets    
Nuclear decommissioning trusts 658 555
Other investments 7 8
Recurring | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 658 555
Recurring | Level 1    
Assets    
Cash equivalents 3,325 438
Derivative assets    
Derivative assets, gross 181 99
Total assets 4,781 1,773
Derivative liabilities    
Derivative liabilities, gross (131) (88)
Net Assets (Liabilities) at end of period 4,650 1,685
Recurring | Level 1 | DTE Electric    
Assets    
Cash equivalents 0 4
Derivative assets    
Total assets 1,149 1,107
Recurring | Level 1 | Current assets    
Derivative assets    
Total assets 3,480 532
Recurring | Level 1 | Current assets | DTE Electric    
Derivative assets    
Total assets 0 4
Recurring | Level 1 | Noncurrent assets    
Derivative assets    
Total assets 1,301 1,241
Recurring | Level 1 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,149 1,103
Recurring | Level 1 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (124) (84)
Recurring | Level 1 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (7) (4)
Recurring | Level 1 | Natural gas    
Derivative assets    
Derivative assets, gross 180 99
Derivative liabilities    
Derivative liabilities, gross (131) (88)
Recurring | Level 1 | Electricity    
Derivative assets    
Derivative assets, gross 0 0
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Environmental & Other    
Derivative assets    
Derivative assets, gross 1 0
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Foreign currency exchange contracts    
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 0 0
Recurring | Level 1 | Cash equivalents    
Assets    
Nuclear decommissioning trusts 34 27
Other investments 86 97
Recurring | Level 1 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 34 27
Other investments 11 11
Recurring | Level 1 | Private equity and other    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 1 | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 1 | Equity securities    
Assets    
Nuclear decommissioning trusts 952 947
Other investments 62 55
Recurring | Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 952 947
Other investments 18 16
Recurring | Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 134 102
Other investments 7 8
Recurring | Level 1 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 134 102
Recurring | Level 2    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 724 352
Total assets 1,149 723
Derivative liabilities    
Derivative liabilities, gross (734) (327)
Net Assets (Liabilities) at end of period 415 396
Recurring | Level 2 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 425 371
Recurring | Level 2 | Current assets    
Derivative assets    
Total assets 530 260
Recurring | Level 2 | Current assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 2 | Noncurrent assets    
Derivative assets    
Total assets 619 463
Recurring | Level 2 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 425 371
Recurring | Level 2 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (511) (223)
Recurring | Level 2 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (223) (104)
Recurring | Level 2 | Natural gas    
Derivative assets    
Derivative assets, gross 110 74
Derivative liabilities    
Derivative liabilities, gross (170) (59)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 255 128
Derivative liabilities    
Derivative liabilities, gross (201) (126)
Recurring | Level 2 | Environmental & Other    
Derivative assets    
Derivative assets, gross 359 150
Derivative liabilities    
Derivative liabilities, gross (356) (137)
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative liabilities    
Derivative liabilities, gross (7) (5)
Recurring | Level 2 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 0 0
Recurring | Level 2 | Cash equivalents    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 2 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 2 | Private equity and other    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 2 | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 2 | Equity securities    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 2 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 2 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 425 371
Other investments 0 0
Recurring | Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 425 371
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 136 116
Total assets 136 116
Derivative liabilities    
Derivative liabilities, gross (351) (118)
Net Assets (Liabilities) at end of period (215) (2)
Recurring | Level 3 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 15 4
Recurring | Level 3 | Current assets    
Derivative assets    
Total assets 109 92
Recurring | Level 3 | Current assets | DTE Electric    
Derivative assets    
Total assets 15 4
Recurring | Level 3 | Noncurrent assets    
Derivative assets    
Total assets 27 24
Recurring | Level 3 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 3 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (220) (79)
Recurring | Level 3 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (131) (39)
Recurring | Level 3 | Natural gas    
Derivative assets    
Derivative assets, gross 46 60
Derivative liabilities    
Derivative liabilities, gross (227) (76)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 75 52
Derivative liabilities    
Derivative liabilities, gross (124) (42)
Recurring | Level 3 | Environmental & Other    
Derivative assets    
Derivative assets, gross 15 4
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 3 | Foreign currency exchange contracts    
Derivative liabilities    
Derivative liabilities, gross 0
Recurring | Level 3 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 15 4
Recurring | Level 3 | Cash equivalents    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 3 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 3 | Private equity and other    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 3 | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 3 | Equity securities    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 3 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 3 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 3 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Other    
Derivative assets    
Total assets 474 408
Derivative liabilities    
Net Assets (Liabilities) at end of period 474 408
Recurring | Other | DTE Electric    
Derivative assets    
Total assets 474 408
Recurring | Other | Noncurrent assets    
Derivative assets    
Total assets 474 408
Recurring | Other | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 474 408
Recurring | Other | Private equity and other    
Assets    
Nuclear decommissioning trusts 159 104
Recurring | Other | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 159 104
Recurring | Other | Equity securities    
Assets    
Nuclear decommissioning trusts 216 222
Recurring | Other | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 216 222
Recurring | Other | Fixed income securities    
Assets    
Nuclear decommissioning trusts 99 82
Recurring | Other | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 99 $ 82
v3.21.2
Fair Value (Details Textuals) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Nuclear decommissioning trust fund | Fixed income securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities with no contractual maturity date $ 99  
Equity or debt securities | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, redemption notice period 7 days  
Equity or debt securities | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments, redemption notice period 65 days  
Private equity and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unfunded commitments related to investments classified as NAV assets $ 159 $ 183
Private equity and other | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments classified as NAV assets, general contractual durations 7 years  
Private equity and other | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments classified as NAV assets, general contractual durations 12 years  
v3.21.2
Fair Value (Reconciliation of Level 3 Assets and Liabilities at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period $ (107) $ 24 $ (2) $ 4
Transfers into Level 3 from Level 2 0 2    
Transfers from Level 3 into Level 2 0 (5) 0 (4)
Total gains (losses)        
Included in earnings (137) 37 (179) 81
Recorded in Regulatory liabilities 16 14 15 12
Purchases, issuances, and settlements        
Settlements 13 (26) (49) (47)
Net Assets (Liabilities) as of end of period (215) 46 (215) 46
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period (131) 22 (231) 63
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period 15 10 15 10
DTE Electric        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period 1 1 4 3
Total gains (losses)        
Recorded in Regulatory liabilities 16 14 15 12
Purchases, issuances, and settlements        
Settlements (2) (5) (4) (5)
Net Assets (Liabilities) as of end of period 15 10 15 10
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period 15 10 15 10
Natural gas        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period (89) 8 (16) (15)
Transfers into Level 3 from Level 2 0 2    
Transfers from Level 3 into Level 2 0 (5) 0 (4)
Total gains (losses)        
Included in earnings (128) 12 (195) 36
Recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements 36 3 30 3
Net Assets (Liabilities) as of end of period (181) 20 (181) 20
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period (98) 18 (192) 37
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period 0 0 0 0
Electricity        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period (19) 15 10 16
Transfers into Level 3 from Level 2 0 0    
Transfers from Level 3 into Level 2 0 0 0 0
Total gains (losses)        
Included in earnings (9) 33 16 53
Recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements (21) (32) (75) (53)
Net Assets (Liabilities) as of end of period (49) 16 (49) 16
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period (18) 20 (24) 42
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period 0 0 0 0
Other        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period 1 1 4 3
Transfers into Level 3 from Level 2 0 0    
Transfers from Level 3 into Level 2 0 0 0 0
Total gains (losses)        
Included in earnings 0 (8) 0 (8)
Recorded in Regulatory liabilities 16 14 15 12
Purchases, issuances, and settlements        
Settlements (2) 3 (4) 3
Net Assets (Liabilities) as of end of period 15 10 15 10
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period (15) (16) (15) (16)
Total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at end of period $ 15 $ 10 $ 15 $ 10
v3.21.2
Fair Value (Unobservable Inputs related to Level 3 Assets and Liabilities) (Details)
$ in Millions
Jun. 30, 2021
USD ($)
MWh
MMBTU
Dec. 31, 2020
USD ($)
MMBTU
MWh
Unobservable Inputs Valuation Techniques [Line Items]    
Derivative Assets $ 1,041 $ 567
Derivative Liabilities (1,216) (533)
Natural gas    
Unobservable Inputs Valuation Techniques [Line Items]    
Derivative Assets 336 233
Derivative Liabilities (528) (223)
Electricity    
Unobservable Inputs Valuation Techniques [Line Items]    
Derivative Assets 330 180
Derivative Liabilities $ (325) $ (168)
Level 3 | Natural gas | Forward basis price | Minimum | Discounted Cash Flow    
Unobservable Inputs Valuation Techniques [Line Items]    
Forward basis price | MMBTU (1.41) (0.86)
Level 3 | Natural gas | Forward basis price | Maximum | Discounted Cash Flow    
Unobservable Inputs Valuation Techniques [Line Items]    
Forward basis price | MMBTU 2.47 2.50
Level 3 | Natural gas | Forward basis price | Weighted Average | Discounted Cash Flow    
Unobservable Inputs Valuation Techniques [Line Items]    
Forward basis price | MMBTU (0.09) (0.07)
Level 3 | Electricity | Forward basis price | Minimum | Discounted Cash Flow    
Unobservable Inputs Valuation Techniques [Line Items]    
Forward basis price | MWh (12) (9)
Level 3 | Electricity | Forward basis price | Maximum | Discounted Cash Flow    
Unobservable Inputs Valuation Techniques [Line Items]    
Forward basis price | MWh 5 6
Level 3 | Electricity | Forward basis price | Weighted Average | Discounted Cash Flow    
Unobservable Inputs Valuation Techniques [Line Items]    
Forward basis price | MWh (1) 0
Recurring | Level 3    
Unobservable Inputs Valuation Techniques [Line Items]    
Derivative Assets $ 136 $ 116
Derivative Liabilities (351) (118)
Recurring | Level 3 | Natural gas    
Unobservable Inputs Valuation Techniques [Line Items]    
Derivative Assets 46 60
Derivative Liabilities (227) (76)
Recurring | Level 3 | Electricity    
Unobservable Inputs Valuation Techniques [Line Items]    
Derivative Assets 75 52
Derivative Liabilities $ (124) $ (42)
v3.21.2
Fair Value (Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Carrying amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable $ 144 $ 141
Short-term borrowings 69 38
Notes payable 5 19
Long-term debt 22,909 19,439
Carrying amount | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 16 16
Notes payable 4 17
Long-term debt 8,943 8,236
Carrying amount | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 194 101
Fair value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
Short-term borrowings 0 0
Notes payable 0 0
Long-term debt 2,236 2,547
Fair value | Level 1 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
Notes payable 0 0
Long-term debt 0 0
Fair value | Level 1 | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 0 0
Fair value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
Short-term borrowings 69 38
Notes payable 0 0
Long-term debt 21,728 18,230
Fair value | Level 2 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
Notes payable 0 0
Long-term debt 10,112 9,579
Fair value | Level 2 | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 0 0
Fair value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 144 141
Short-term borrowings 0 0
Notes payable 5 19
Long-term debt 1,115 1,397
Fair value | Level 3 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 16 16
Notes payable 4 17
Long-term debt 150 379
Fair value | Level 3 | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings $ 194 $ 101
v3.21.2
Fair Value (Fair Value of Nuclear Decommissioning Trust Fund Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Nuclear decommissioning trust funds $ 2,019 $ 1,855
DTE Electric    
Debt Securities, Available-for-sale [Line Items]    
Nuclear decommissioning trust funds 2,019 1,855
DTE Electric | Nuclear decommissioning trust fund    
Debt Securities, Available-for-sale [Line Items]    
Nuclear decommissioning trust funds 2,019 1,855
DTE Electric | Nuclear decommissioning trust fund | Fermi 2    
Debt Securities, Available-for-sale [Line Items]    
Nuclear decommissioning trust funds 2,002 1,841
DTE Electric | Nuclear decommissioning trust fund | Fermi 1    
Debt Securities, Available-for-sale [Line Items]    
Nuclear decommissioning trust funds 3 3
DTE Electric | Nuclear decommissioning trust fund | Low-level radioactive waste    
Debt Securities, Available-for-sale [Line Items]    
Nuclear decommissioning trust funds $ 14 $ 11
v3.21.2
Fair Value (Gains and Losses and Proceeds from the Sale of Securities by the Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - Nuclear decommissioning trust fund - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]        
Realized gains $ 35 $ 103 $ 59 $ 134
Realized losses (6) (76) (8) (92)
Proceeds from sale of securities $ 366 $ 799 $ 637 $ 1,238
v3.21.2
Fair Value (Fair Value and Unrealized Gains and Losses for the Nuclear Decommissioning Trust Funds) (Details) - DTE Electric - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Fair Value $ 2,019 $ 1,855
Unrealized Gains 596 501
Unrealized Losses (7) (7)
Cash equivalents    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 34 27
Private equity and other    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 159 104
Unrealized Gains 26 0
Unrealized Losses 0 0
Equity securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 1,168 1,169
Unrealized Gains 546 481
Unrealized Losses (4) (6)
Fixed income securities    
Debt Securities, Available-for-sale [Line Items]    
Fair Value 658 555
Unrealized Gains 24 20
Unrealized Losses $ (3) $ (1)
v3.21.2
Fair Value (Fair Value of Fixed Income Securities Held in Nuclear Decommissioning Trust Funds (Details) - Fixed income securities - Nuclear decommissioning trust fund
$ in Millions
Jun. 30, 2021
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Due within one year $ 7
Due after one through five years 151
Due after five through ten years 113
Due after ten years 288
Fixed income securities total $ 559
v3.21.2
Fair Value (Gains (Losses) Related to the trust) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Rabbi Trust        
Schedule of Investments [Line Items]        
Gains (losses) related to the trust $ 2 $ 22 $ 4 $ (9)
Equity securities        
Schedule of Investments [Line Items]        
Gains (losses) related to the trust 2 16 4 (6)
Fixed income securities        
Schedule of Investments [Line Items]        
Gains (losses) related to the trust $ 0 $ 6 $ 0 $ (3)
v3.21.2
Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 1,041 $ 567
Derivative Liabilities (1,216) (533)
Current derivative assets    
Derivatives, Fair Value [Line Items]    
Derivative Assets 794 446
Current derivative liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities (855) (386)
Noncurrent derivative assets    
Derivatives, Fair Value [Line Items]    
Derivative Assets 247 121
Noncurrent derivative liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities (361) (147)
Foreign currency exchange contracts    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities (7) (5)
Natural gas    
Derivatives, Fair Value [Line Items]    
Derivative Assets 336 233
Derivative Liabilities (528) (223)
Electricity    
Derivatives, Fair Value [Line Items]    
Derivative Assets 330 180
Derivative Liabilities (325) (168)
Environmental & Other    
Derivatives, Fair Value [Line Items]    
Derivative Assets 375 154
Derivative Liabilities (356) (137)
Derivatives designated as hedging instruments | Foreign currency exchange contracts    
Derivatives, Fair Value [Line Items]    
Derivative Assets 0 0
Derivative Liabilities (4) (4)
Derivatives not designated as hedging instruments    
Derivatives, Fair Value [Line Items]    
Derivative Assets 1,041 567
Derivative Liabilities (1,212) (529)
Derivatives not designated as hedging instruments | DTE Electric    
Derivatives, Fair Value [Line Items]    
Derivative Assets 15 4
Derivatives not designated as hedging instruments | Foreign currency exchange contracts    
Derivatives, Fair Value [Line Items]    
Derivative Assets 0 0
Derivative Liabilities (3) (1)
Derivatives not designated as hedging instruments | Natural gas    
Derivatives, Fair Value [Line Items]    
Derivative Assets 336 233
Derivative Liabilities (528) (223)
Derivatives not designated as hedging instruments | Electricity    
Derivatives, Fair Value [Line Items]    
Derivative Assets 330 180
Derivative Liabilities (325) (168)
Derivatives not designated as hedging instruments | Environmental & Other    
Derivatives, Fair Value [Line Items]    
Derivative Assets 375 154
Derivative Liabilities (356) (137)
Derivatives not designated as hedging instruments | FTRs — Other current assets | DTE Electric    
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 15 $ 4
v3.21.2
Financial and Other Derivative Instruments (Details Textuals) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Letters of credit that could be used to offset net derivative liabilities $ 11,000,000 $ 7,000,000
Letters of credit received that could be used to offset net derivative assets 34,000,000 $ 9,000,000
Contractual obligation to post collateral in event of downgrade to below investment grade 467,000,000  
Derivative net liability position aggregate fair value 969,000,000  
Collateral already posted fair value 0  
Derivative net asset position, fair value 821,000,000  
Remaining amount of offsets to derivative net liability positions for hard and soft trigger provisions $ 148,000,000  
v3.21.2
Financial and Other Derivative Instruments (Net Cash Collateral Offsetting Arrangements) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Cash collateral netted against Derivative assets $ 0 $ (12)
Cash collateral netted against Derivative liabilities 0 6
Cash collateral recorded in Accounts receivable 23 14
Cash collateral recorded in Accounts payable (1) (1)
Total net cash collateral posted (received) $ 22 $ 7
v3.21.2
Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivative assets    
Gross Amounts of Recognized Assets (Liabilities) $ 1,041 $ 567
Gross Amounts Offset in the Consolidated Statements of Financial Position (820) (411)
Derivative assets, net 221 156
Derivative liabilities    
Gross Amounts of Recognized Assets (Liabilities) (1,216) (533)
Gross Amounts Offset in the Consolidated Statements of Financial Position 820 405
Derivative liabilities, net (396) (128)
Natural gas    
Derivative assets    
Gross Amounts of Recognized Assets (Liabilities) 336 233
Gross Amounts Offset in the Consolidated Statements of Financial Position (289) (156)
Derivative assets, net 47 77
Derivative liabilities    
Gross Amounts of Recognized Assets (Liabilities) (528) (223)
Gross Amounts Offset in the Consolidated Statements of Financial Position 289 151
Derivative liabilities, net (239) (72)
Electricity    
Derivative assets    
Gross Amounts of Recognized Assets (Liabilities) 330 180
Gross Amounts Offset in the Consolidated Statements of Financial Position (192) (120)
Derivative assets, net 138 60
Derivative liabilities    
Gross Amounts of Recognized Assets (Liabilities) (325) (168)
Gross Amounts Offset in the Consolidated Statements of Financial Position 192 125
Derivative liabilities, net (133) (43)
Environmental & Other    
Derivative assets    
Gross Amounts of Recognized Assets (Liabilities) 375 154
Gross Amounts Offset in the Consolidated Statements of Financial Position (339) (135)
Derivative assets, net 36 19
Derivative liabilities    
Gross Amounts of Recognized Assets (Liabilities) (356) (137)
Gross Amounts Offset in the Consolidated Statements of Financial Position 339 129
Derivative liabilities, net $ (17) $ (8)
v3.21.2
Financial and Other Derivative Instruments (Netting Offsets Reconciliation to Balance Sheet) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivative Assets    
Derivative Assets $ 1,041 $ 567
Collateral adjustment 0 (12)
Derivative assets, current 171 116
Derivative assets, noncurrent 50 40
Derivative Liabilities    
Derivative Liabilities (1,216) (533)
Collateral adjustment 0 6
Derivative liabilities, current (232) (68)
Derivative liabilities, noncurrent (164) (60)
Current derivative assets    
Derivative Assets    
Derivative Assets 794 446
Counterparty netting (623) (318)
Collateral adjustment 0 (12)
Derivative assets, current 171 116
Noncurrent derivative assets    
Derivative Assets    
Derivative Assets 247 121
Counterparty netting (197) (81)
Collateral adjustment 0 0
Derivative assets, noncurrent 50 40
Current derivative liabilities    
Derivative Liabilities    
Derivative Liabilities (855) (386)
Counterparty netting 623 318
Collateral adjustment 0 0
Derivative liabilities, current (232) (68)
Noncurrent derivative liabilities    
Derivative Liabilities    
Derivative Liabilities (361) (147)
Counterparty netting 197 81
Collateral adjustment 0 6
Derivative liabilities, noncurrent $ (164) $ (60)
v3.21.2
Financial and Other Derivative Instruments (Effect of Derivatives not Designated as Hedging Instruments on the Consolidated Statement of Operations) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivatives $ (104) $ (7) $ (203) $ 46
Natural gas | Operating Revenues — Non-utility operations        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivatives (114) (25) (157) (36)
Natural gas | Fuel, purchased power, gas, and other — non-utility        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivatives (24) 43 (79) 79
Electricity | Operating Revenues — Non-utility operations        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivatives 42 41 75 42
Environmental & Other | Operating Revenues — Non-utility operations        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivatives (7) (63) (39) (41)
Foreign currency exchange contracts | Operating Revenues — Non-utility operations        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) Recognized in Income on Derivatives $ (1) $ (3) $ (3) $ 2
v3.21.2
Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts Outstanding) (Details)
 6 Months Ended
Jun. 30, 2021
CAD ($)
MMBTU
MWh
T
Natural gas (MMBtu)  
Derivative [Line Items]  
Commodity, energy measures | MMBTU 1,839,526,884
Electricity (MWh)  
Derivative [Line Items]  
Commodity, energy measures 33,751,897
Foreign currency exchange ($ CAD)  
Derivative [Line Items]  
Commodity, monetary measure | $ $ 121,659,867
Renewable Energy Certificates (MWh)  
Derivative [Line Items]  
Commodity, energy measures 11,051,843
Carbon emissions (Metric Tons)  
Derivative [Line Items]  
Commodity, mass measure | T 28,873,477
v3.21.2
Long-Term Debt (Schedule of Issued Debt) (Details) - USD ($)
 1 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Debt Instrument [Line Items]    
Amount $ 4,100,000,000  
DTE Electric | Mortgage Bonds | March 2021 1.9% Mortgage Bonds maturing in 2028    
Debt Instrument [Line Items]    
Interest rate   1.90%
Amount   $ 575,000,000
DTE Electric | Mortgage Bonds | March 2021 3.25% Mortgage Bonds maturing In 2051    
Debt Instrument [Line Items]    
Interest rate   3.25%
Amount   $ 425,000,000
DT Midstream | June 2021 Variable Rate Term Loan maturing in 2028    
Debt Instrument [Line Items]    
Amount $ 1,000,000,000  
DT Midstream | June 2021 Variable Rate Term Loan maturing in 2028 | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.00%  
DT Midstream | June 2021 Variable Rate Term Loan maturing in 2028 | LIBOR | Minimum    
Debt Instrument [Line Items]    
Variable rate 0.50%  
DT Midstream | June 2021 Variable Rate Term Loan maturing in 2028 | Six-month LIBOR    
Debt Instrument [Line Items]    
Amount $ 900,000,000  
DT Midstream | June 2021 Variable Rate Term Loan maturing in 2028 | Three-month LIBOR    
Debt Instrument [Line Items]    
Amount 100,000,000  
DT Midstream | Senior Notes    
Debt Instrument [Line Items]    
Amount $ 2,100,000,000  
DT Midstream | Senior Notes | June 2021 4.125% Senior Notes maturing in 2029    
Debt Instrument [Line Items]    
Interest rate 4.125%  
Amount $ 1,100,000,000  
DT Midstream | Senior Notes | June 2021 4.375% Senior Notes maturing in 2031    
Debt Instrument [Line Items]    
Interest rate 4.375%  
Amount $ 1,000,000,000  
v3.21.2
Long-Term Debt (Schedule of Debt Redeemed) (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 27, 2021
Jun. 30, 2021
May 31, 2021
Apr. 30, 2021
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Debt Instrument, Redemption [Line Items]              
Amount           $ 583 $ 300
Loss on extinguishment of debt         $ (8) $ 8  
Subsequent Event              
Debt Instrument, Redemption [Line Items]              
Amount $ 2,247            
Senior Notes | 5.375% Junior Subordinated Debentures maturing in 2076              
Debt Instrument, Redemption [Line Items]              
Interest rate   5.375%     5.375% 5.375%  
Amount   $ 300          
Senior Notes | 3.30% Senior Notes maturing in 2022 | Subsequent Event              
Debt Instrument, Redemption [Line Items]              
Interest rate 3.30%            
Amount $ 300            
Senior Notes | 2.60% Senior Notes maturing in 2022 | Subsequent Event              
Debt Instrument, Redemption [Line Items]              
Interest rate 2.60%            
Amount $ 300            
Senior Notes | 3.70% Senior Notes maturing in 2023 | Subsequent Event              
Debt Instrument, Redemption [Line Items]              
Interest rate 3.70%            
Amount $ 600            
Senior Notes | 3.85% Senior Notes maturing in 2023 | Subsequent Event              
Debt Instrument, Redemption [Line Items]              
Interest rate 3.85%            
Amount $ 135            
Senior Notes | 3.50% Senior Notes maturing in 2024 | Subsequent Event              
Debt Instrument, Redemption [Line Items]              
Interest rate 3.50%            
Amount $ 350            
Senior Notes | 3.80% Senior Notes maturing in 2027 | Subsequent Event              
Debt Instrument, Redemption [Line Items]              
Interest rate 3.80%            
Amount $ 350            
Senior Notes | 3.40% Senior Notes maturing in 2029 | Subsequent Event              
Debt Instrument, Redemption [Line Items]              
Interest rate 3.40%            
Amount $ 21            
Senior Notes | 6.375% Senior Notes maturing in 2033 | Subsequent Event              
Debt Instrument, Redemption [Line Items]              
Interest rate 6.375%            
Amount $ 191            
DTE Electric              
Debt Instrument, Redemption [Line Items]              
Amount           $ 283 $ 300
DTE Electric | Mortgage Bonds | 3.90% Mortgage bonds maturing in 2021              
Debt Instrument, Redemption [Line Items]              
Interest rate       3.90%      
Amount       $ 250      
DTE Electric | Mortgage Bonds | 7.00% Mortgage Bonds maturing in 2021              
Debt Instrument, Redemption [Line Items]              
Interest rate     7.00%        
Amount     $ 33        
v3.21.2
Long-Term Debt (Details Textuals) - USD ($)
$ in Millions
 1 Months Ended 6 Months Ended
Aug. 31, 2021
Jul. 27, 2021
Jun. 30, 2021
Jun. 30, 2020
Debt Instrument [Line Items]        
Redemption of long-term debt     $ 583 $ 300
Subsequent Event        
Debt Instrument [Line Items]        
Redemption of long-term debt   $ 2,247    
Prepayment costs for early retiremnt of debt   $ 235    
Subsequent Event | Forecast        
Debt Instrument [Line Items]        
Redemption of long-term debt $ 374      
Subsequent Event | Forecast | 3.85% Senior Notes maturing in 2023        
Debt Instrument [Line Items]        
Redemption of long-term debt $ 165      
Interest rate 3.85%      
Subsequent Event | Forecast | 6.375% Senior Notes maturing in 2033        
Debt Instrument [Line Items]        
Redemption of long-term debt $ 209      
Interest rate 6.375%      
v3.21.2
Short-Term Credit Arrangements and Borrowings (Details Textuals)
Sep. 30, 2021
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Short-term Debt [Line Items]      
Maximum borrowing capacity   $ 2,732,000,000  
Amounts outstanding   299,000,000  
Revolving credit facility      
Short-term Debt [Line Items]      
Amounts outstanding   69,000,000  
Letters of credit      
Short-term Debt [Line Items]      
Amounts outstanding   230,000,000  
Secured revolving credit facility, expiring June 2026      
Short-term Debt [Line Items]      
Maximum borrowing capacity   $ 33,000,000  
DTE Electric      
Short-term Debt [Line Items]      
Ratio of indebtedness to net capital   0.53  
Maximum borrowing capacity   $ 500,000,000  
Amounts outstanding   0  
DTE Electric | Revolving credit facility      
Short-term Debt [Line Items]      
Amounts outstanding   0  
DTE Electric | Letters of credit      
Short-term Debt [Line Items]      
Amounts outstanding   0  
DTE Electric | Secured revolving credit facility, expiring June 2026      
Short-term Debt [Line Items]      
Maximum borrowing capacity   $ 0  
DTE Gas      
Short-term Debt [Line Items]      
Ratio of indebtedness to net capital   0.47  
Maximum borrowing capacity   $ 300,000,000  
Amounts outstanding   0  
DTE Gas | Revolving credit facility      
Short-term Debt [Line Items]      
Amounts outstanding   0  
DTE Gas | Letters of credit      
Short-term Debt [Line Items]      
Amounts outstanding   0  
DTE Gas | Secured revolving credit facility, expiring June 2026      
Short-term Debt [Line Items]      
Maximum borrowing capacity   0  
DT Midstream | Secured revolving credit facility, expiring June 2026      
Short-term Debt [Line Items]      
Maximum borrowing capacity   $ 750,000,000  
DTE Energy      
Short-term Debt [Line Items]      
Ratio of indebtedness to net capital   0.64  
Maximum borrowing capacity   $ 1,932,000,000  
Amounts outstanding   299,000,000  
DTE Energy | Revolving credit facility      
Short-term Debt [Line Items]      
Amounts outstanding   69,000,000  
DTE Energy | Letters of credit      
Short-term Debt [Line Items]      
Amounts outstanding   230,000,000  
DTE Energy | Demand financing agreement      
Short-term Debt [Line Items]      
Maximum borrowing capacity, financing agreement   300,000,000  
Amount outstanding   18,000,000 $ 49,000,000
DTE Energy | Secured revolving credit facility, expiring June 2026      
Short-term Debt [Line Items]      
Maximum borrowing capacity   33,000,000  
DTE Energy | Secured revolving credit facility, expiring June 2026 | Revolving credit facility      
Short-term Debt [Line Items]      
Maximum borrowing capacity   25,000,000  
DTE Energy | Secured revolving credit facility, expiring June 2026 | Letters of credit      
Short-term Debt [Line Items]      
Maximum borrowing capacity   8,000,000  
DTE Energy | Other outstanding letters of credit | Letters of credit      
Short-term Debt [Line Items]      
Amounts outstanding   9,000,000  
DTE Energy | Demand financing agreement, indefinite term | Demand financing agreement      
Short-term Debt [Line Items]      
Maximum borrowing capacity, financing agreement   100,000,000  
Maximum additional margin financing   50,000,000  
DTE Energy | Demand financing agreement, expiring in 2022 | Demand financing agreement      
Short-term Debt [Line Items]      
Maximum borrowing capacity, financing agreement   $ 150,000,000  
Maximum      
Short-term Debt [Line Items]      
Ratio of indebtedness to net capital   0.65  
Maximum | Forecast      
Short-term Debt [Line Items]      
Ratio of indebtedness to net capital 0.70    
v3.21.2
Short-Term Credit Arrangements and Borrowings (Details)
Jun. 30, 2021
USD ($)
Availability under combined facilities  
Maximum borrowing capacity $ 2,732,000,000
Amounts outstanding 299,000,000
Net availability 2,433,000,000
DTE Electric  
Availability under combined facilities  
Maximum borrowing capacity 500,000,000
Amounts outstanding 0
Net availability 500,000,000
DTE Gas  
Availability under combined facilities  
Maximum borrowing capacity 300,000,000
Amounts outstanding 0
Net availability 300,000,000
DTE Energy  
Availability under combined facilities  
Maximum borrowing capacity 1,932,000,000
Amounts outstanding 299,000,000
Net availability 1,633,000,000
Revolver borrowings  
Availability under combined facilities  
Amounts outstanding 69,000,000
Revolver borrowings | DTE Electric  
Availability under combined facilities  
Amounts outstanding 0
Revolver borrowings | DTE Gas  
Availability under combined facilities  
Amounts outstanding 0
Revolver borrowings | DTE Energy  
Availability under combined facilities  
Amounts outstanding 69,000,000
Letters of credit  
Availability under combined facilities  
Amounts outstanding 230,000,000
Letters of credit | DTE Electric  
Availability under combined facilities  
Amounts outstanding 0
Letters of credit | DTE Gas  
Availability under combined facilities  
Amounts outstanding 0
Letters of credit | DTE Energy  
Availability under combined facilities  
Amounts outstanding 230,000,000
Unsecured revolving credit facility, expiring April 2025 | Revolver borrowings  
Availability under combined facilities  
Maximum borrowing capacity 2,300,000,000
Unsecured revolving credit facility, expiring April 2025 | Revolver borrowings | DTE Electric  
Availability under combined facilities  
Maximum borrowing capacity 500,000,000
Unsecured revolving credit facility, expiring April 2025 | Revolver borrowings | DTE Gas  
Availability under combined facilities  
Maximum borrowing capacity 300,000,000
Unsecured revolving credit facility, expiring April 2025 | Revolver borrowings | DTE Energy  
Availability under combined facilities  
Maximum borrowing capacity 1,500,000,000
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolver borrowings  
Availability under combined facilities  
Maximum borrowing capacity 89,000,000
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolver borrowings | DTE Electric  
Availability under combined facilities  
Maximum borrowing capacity 0
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolver borrowings | DTE Gas  
Availability under combined facilities  
Maximum borrowing capacity 0
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolver borrowings | DTE Energy  
Availability under combined facilities  
Maximum borrowing capacity 89,000,000
Secured revolving credit facility, expiring June 2026  
Availability under combined facilities  
Maximum borrowing capacity 33,000,000
Secured revolving credit facility, expiring June 2026 | DTE Electric  
Availability under combined facilities  
Maximum borrowing capacity 0
Secured revolving credit facility, expiring June 2026 | DTE Gas  
Availability under combined facilities  
Maximum borrowing capacity 0
Secured revolving credit facility, expiring June 2026 | DT Midstream  
Availability under combined facilities  
Maximum borrowing capacity 750,000,000
Secured revolving credit facility, expiring June 2026 | DTE Energy  
Availability under combined facilities  
Maximum borrowing capacity 33,000,000
Secured revolving credit facility, expiring June 2026 | Revolver borrowings | DTE Energy  
Availability under combined facilities  
Maximum borrowing capacity 25,000,000
Secured revolving credit facility, expiring June 2026 | Letters of credit | DTE Energy  
Availability under combined facilities  
Maximum borrowing capacity 8,000,000
Unsecured letter of credit facility, expiring in February 2023 | Letters of credit  
Availability under combined facilities  
Maximum borrowing capacity 150,000,000
Unsecured letter of credit facility, expiring in February 2023 | Letters of credit | DTE Electric  
Availability under combined facilities  
Maximum borrowing capacity 0
Unsecured letter of credit facility, expiring in February 2023 | Letters of credit | DTE Gas  
Availability under combined facilities  
Maximum borrowing capacity 0
Unsecured letter of credit facility, expiring in February 2023 | Letters of credit | DTE Energy  
Availability under combined facilities  
Maximum borrowing capacity 150,000,000
Unsecured letter of credit facility, expiring in August 2021 | Letters of credit  
Availability under combined facilities  
Maximum borrowing capacity 110,000,000
Unsecured letter of credit facility, expiring in August 2021 | Letters of credit | DTE Electric  
Availability under combined facilities  
Maximum borrowing capacity 0
Unsecured letter of credit facility, expiring in August 2021 | Letters of credit | DTE Gas  
Availability under combined facilities  
Maximum borrowing capacity 0
Unsecured letter of credit facility, expiring in August 2021 | Letters of credit | DTE Energy  
Availability under combined facilities  
Maximum borrowing capacity 110,000,000
Unsecured letter of credit facility | Letters of credit  
Availability under combined facilities  
Maximum borrowing capacity 50,000,000
Unsecured letter of credit facility | Letters of credit | DTE Electric  
Availability under combined facilities  
Maximum borrowing capacity 0
Unsecured letter of credit facility | Letters of credit | DTE Gas  
Availability under combined facilities  
Maximum borrowing capacity 0
Unsecured letter of credit facility | Letters of credit | DTE Energy  
Availability under combined facilities  
Maximum borrowing capacity 50,000,000
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings  
Availability under combined facilities  
Maximum borrowing capacity 102,000,000
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings | DTE Electric  
Availability under combined facilities  
Maximum borrowing capacity 22,000,000
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings | DTE Gas  
Availability under combined facilities  
Maximum borrowing capacity 13,000,000
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings | DTE Energy  
Availability under combined facilities  
Maximum borrowing capacity $ 67,000,000
v3.21.2
Leases (Details Textuals) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]          
Additional net investment in finance leases   $ 31      
Interest income recognized under finance leases $ 5   $ 4 $ 9 $ 8
v3.21.2
Leases (Components of Net Investment in Finance Leases) (Details)
$ in Millions
Jun. 30, 2021
USD ($)
Leases [Abstract]  
2021 $ 13
2022 22
2023 21
2024 22
2025 22
2026 and Thereafter 292
Total minimum future lease receipts 392
Residual value of leased pipeline 17
Less unearned income 206
Net investment in finance lease 203
Less current portion 8
Net investment in finance lease, noncurrent $ 195
v3.21.2
Leases (Lease Income Associated with Operating Leases) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lessor, Lease, Description [Line Items]        
Fixed payments $ 16 $ 17 $ 33 $ 33
Variable payments 18 16 35 39
Total lease income under operating leases 34 33 68 72
Operating revenues        
Lessor, Lease, Description [Line Items]        
Total lease income under operating leases 24 23 48 52
Other income        
Lessor, Lease, Description [Line Items]        
Total lease income under operating leases $ 10 $ 10 $ 20 $ 20
v3.21.2
Commitments and Contingencies (Details Textuals)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2021
USD ($)
employee
Jun. 30, 2021
USD ($)
employee
facility
site
Dec. 31, 2020
USD ($)
Jul. 31, 2019
CAD ($)
Loss Contingencies [Line Items]          
Estimated capital expenditures and contributions to equity method investees for current fiscal year   $ 3,900,000,000 $ 3,900,000,000    
Receivables reserved   $ 115,000,000 $ 115,000,000 $ 104,000,000  
Workforce subject to collective bargaining arrangements | Labor force concentration risk          
Loss Contingencies [Line Items]          
Number of employees | employee   5,200 5,200    
Percentage of total employees     49.00%    
Synthetic fuel          
Loss Contingencies [Line Items]          
Number of days after expiration of statutes of limitations     90 days    
Maximum potential liability   $ 400,000,000 $ 400,000,000    
Reduced emissions fuel guarantees          
Loss Contingencies [Line Items]          
Number of days after expiration of statutes of limitations     90 days    
Maximum potential liability   617,000,000 $ 617,000,000    
Other guarantees          
Loss Contingencies [Line Items]          
Maximum potential liability   50,000,000 50,000,000    
Performance surety bonds          
Loss Contingencies [Line Items]          
Performance bonds outstanding   176,000,000 176,000,000    
Vector | Revolving Term Credit Facility          
Loss Contingencies [Line Items]          
Financing receivables         $ 70,000,000
Maximum potential payments under line of credit   56,000,000 $ 56,000,000    
Reduction of Carbon Emissions by 2023          
Loss Contingencies [Line Items]          
Commitment to reduce carbon emissions, percentage     32.00%    
Reduction of Carbon Emissions by 2030          
Loss Contingencies [Line Items]          
Commitment to reduce carbon emissions, percentage     50.00%    
Reduction of Carbon Emissions by 2040          
Loss Contingencies [Line Items]          
Commitment to reduce carbon emissions, percentage     80.00%    
DTE Electric          
Loss Contingencies [Line Items]          
Environmental capital expenditures   2,400,000,000 $ 2,400,000,000    
Estimated environmental capital expenditures     $ 0    
Number of former MGP sites | site     3    
Accrued for remediation   10,000,000 $ 10,000,000 10,000,000  
Number of permitted engineered ash storage facilities owned | facility     3    
Estimated capital expenditures and contributions to equity method investees for current fiscal year   3,000,000,000.0 $ 3,000,000,000.0    
Receivables reserved   $ 56,000,000 $ 56,000,000 57,000,000  
DTE Electric | Workforce subject to collective bargaining arrangements | Labor force concentration risk          
Loss Contingencies [Line Items]          
Number of employees | employee   2,700 2,700    
Percentage of total employees     57.00%    
DTE Electric | Performance surety bonds          
Loss Contingencies [Line Items]          
Performance bonds outstanding   $ 120,000,000 $ 120,000,000    
DTE Electric | Reduction of Carbon Emissions by 2050          
Loss Contingencies [Line Items]          
Goal of net carbon emissions, percentage     0.00%    
DTE Electric | Coal Combustion Residual And Effluent Limitations Guidelines Rules          
Loss Contingencies [Line Items]          
Estimated impact of the CCR and ELG rules   718,000,000 $ 718,000,000    
Estimated impact of the CCR and ELG rules through 2025   573,000,000 $ 573,000,000    
DTE Gas          
Loss Contingencies [Line Items]          
Number of former MGP sites | site     14    
Accrued for remediation   23,000,000 $ 23,000,000 $ 24,000,000  
Amortization period (in years)     10 years    
DTE Gas | Clean up completed and site closed          
Loss Contingencies [Line Items]          
Number of former MGP sites | site     8    
DTE Gas | Partial closure complete          
Loss Contingencies [Line Items]          
Number of former MGP sites | site     4    
DTE Gas | Reduction of Greenhouse Gas Emissions by 2050          
Loss Contingencies [Line Items]          
Goal of net greenhouse gas emissions, percentage 0.00%        
DTE Energy Trading | Brilliant          
Loss Contingencies [Line Items]          
Receivables reserved   9,000,000 $ 9,000,000    
Receivables recovered   $ 3,000,000      
v3.21.2
Retirement Benefits and Trusteed Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 27 $ 24 $ 54 $ 49
Interest cost 40 47 79 93
Expected return on plan assets (86) (83) (170) (166)
Amortization of net actuarial loss 49 43 98 86
Amortization of prior service credit 0 0 0 0
Net periodic benefit cost (credit) 30 31 61 62
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 7 7 15 13
Interest cost 12 14 23 28
Expected return on plan assets (32) (32) (64) (64)
Amortization of net actuarial loss 4 3 7 8
Amortization of prior service credit (5) (5) (10) (10)
Net periodic benefit cost (credit) (14) (13) (29) (25)
Other Postretirement Benefits | DTE Electric        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 5 5 11 10
Interest cost 9 10 17 21
Expected return on plan assets (21) (22) (43) (44)
Amortization of net actuarial loss 3 3 6 6
Amortization of prior service credit (4) (3) (7) (7)
Net periodic benefit cost (credit) $ (8) $ (7) $ (16) $ (14)
v3.21.2
Retirement Benefits and Trusteed Assets (Details Textuals) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension plans | Qualified Plan | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Anticipated contributions, current fiscal year $ 107,000,000   $ 107,000,000  
Postretirement benefit plans        
Defined Benefit Plan Disclosure [Line Items]        
Anticipated contributions, current fiscal year 0   0  
DTE Electric | Pension plans        
Defined Benefit Plan Disclosure [Line Items]        
Pension cost 26,000,000 $ 25,000,000 52,000,000 $ 51,000,000
DTE Electric | Pension plans | Qualified Plan | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Anticipated contributions, current fiscal year $ 100,000,000   $ 100,000,000  
v3.21.2
Segment and Related Information (Details Textuals)
customer in Millions
Jun. 30, 2021
customer
Segment Reporting [Abstract]  
Number of electric utility customers 2.2
Number of gas utility customers 1.3
v3.21.2
Segment and Related Information (Financial Data - Inter-segment Billing) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Operating Revenues $ (3,229) $ (2,583) $ (7,007) $ (5,605)
Electric        
Segment Reporting Information [Line Items]        
Operating Revenues (1,411) (1,312) (2,775) (2,528)
Gas        
Segment Reporting Information [Line Items]        
Operating Revenues (265) (251) (877) (791)
Gas Storage and Pipelines        
Segment Reporting Information [Line Items]        
Operating Revenues (208) (172) (405) (342)
Power and Industrial Projects        
Segment Reporting Information [Line Items]        
Operating Revenues (394) (219) (760) (526)
Energy Trading        
Segment Reporting Information [Line Items]        
Operating Revenues (1,167) (740) (2,606) (1,653)
Reconciliation and Eliminations        
Segment Reporting Information [Line Items]        
Operating Revenues 216 112 417 236
Reconciliation and Eliminations | Electric        
Segment Reporting Information [Line Items]        
Operating Revenues 15 15 31 30
Reconciliation and Eliminations | Gas        
Segment Reporting Information [Line Items]        
Operating Revenues 3 4 7 8
Reconciliation and Eliminations | Gas Storage and Pipelines        
Segment Reporting Information [Line Items]        
Operating Revenues 9 5 14 9
Reconciliation and Eliminations | Power and Industrial Projects        
Segment Reporting Information [Line Items]        
Operating Revenues 176 80 338 174
Reconciliation and Eliminations | Energy Trading        
Segment Reporting Information [Line Items]        
Operating Revenues 13 8 26 14
Reconciliation and Eliminations | Corporate and Other        
Segment Reporting Information [Line Items]        
Operating Revenues $ 0 $ 0 $ 1 $ 1
v3.21.2
Segment and Related Information (Financial Data - Operating Revenues including Inter-segment Revenues) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues — Utility operations $ 1,655 $ 1,542 $ 3,608 $ 3,275
Operating Revenues — Non-utility operations 1,574 1,041 3,399 2,330
Operating Revenues 3,229 2,583 7,007 5,605
Reconciliation and Eliminations        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues — Non-utility operations (216) (112) (417) (236)
Operating Revenues (216) (112) (417) (236)
Electric        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues 1,411 1,312 2,775 2,528
Electric | Operating segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues — Utility operations 1,408 1,309 2,768 2,521
Operating Revenues — Non-utility operations 3 3 7 7
Electric | Reconciliation and Eliminations        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues (15) (15) (31) (30)
Gas        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues 265 251 877 791
Gas | Operating segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues — Utility operations 265 251 877 791
Gas | Reconciliation and Eliminations        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues (3) (4) (7) (8)
Gas Storage and Pipelines        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues 208 172 405 342
Gas Storage and Pipelines | Operating segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues — Non-utility operations 208 172 405 342
Gas Storage and Pipelines | Reconciliation and Eliminations        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues (9) (5) (14) (9)
Power and Industrial Projects        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues 394 219 760 526
Power and Industrial Projects | Operating segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues — Non-utility operations 394 219 760 526
Power and Industrial Projects | Reconciliation and Eliminations        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues (176) (80) (338) (174)
Energy Trading        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues 1,167 740 2,606 1,653
Energy Trading | Operating segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues — Non-utility operations 1,167 740 2,606 1,653
Energy Trading | Reconciliation and Eliminations        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues (13) (8) (26) (14)
Corporate and Other | Operating segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues — Non-utility operations 0 1 1 1
Corporate and Other | Reconciliation and Eliminations        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating Revenues $ 0 $ 0 $ (1) $ (1)
v3.21.2
Segment and Related Information (Financial Data - Net Income (Loss) Attributable to DTE Energy by Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net Income Attributable to DTE Energy Company $ 179 $ 277 $ 576 $ 617
Electric        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net Income Attributable to DTE Energy Company 238 183 446 277
Gas        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net Income Attributable to DTE Energy Company 7 1 176 122
Gas Storage and Pipelines        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net Income Attributable to DTE Energy Company 64 70 143 142
Power and Industrial Projects        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net Income Attributable to DTE Energy Company 14 25 42 55
Energy Trading        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net Income Attributable to DTE Energy Company (66) (1) (121) 33
Corporate and Other        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Net Income Attributable to DTE Energy Company $ (78) $ (1) $ (110) $ (12)