MARATHON PETROLEUM CORP, 10-Q filed on 11/4/2025
Quarterly Report
v3.25.3
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2025
Oct. 31, 2025
Cover [Abstract]    
Entity Central Index Key 0001510295  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus (Q1,Q2,Q3,FY) Q3  
Amendment Flag false  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2025  
Document Transition Report false  
Entity File Number 001-35054  
Entity Registrant Name Marathon Petroleum Corporation  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 27-1284632  
Entity Address, Address Line One 539 South Main Street  
Entity Address, City or Town Findlay  
Entity Address, State or Province OH  
Entity Address, Postal Zip Code 45840-3229  
City Area Code 419  
Local Phone Number 422-2121  
Title of 12(b) Security Common Stock, par value $.01  
Trading Symbol MPC  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   300,602,479
v3.25.3
Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues and other income:        
Sales and other operating revenues [1] $ 34,809 $ 35,107 $ 100,125 $ 105,727
Income from equity method investments 976 219 1,418 796
Net gain (loss) on disposal of assets (2) (2) 4 17
Other income 66 49 253 406
Total revenues and other income 35,849 35,373 101,800 106,946
Costs and expenses:        
Cost of revenues (excludes items below) 31,200 32,144 90,585 95,682
Depreciation and amortization 841 846 2,423 2,511
Selling, general and administrative expenses 863 815 2,513 2,417
Other taxes 232 219 682 681
Total costs and expenses 33,136 34,024 96,203 101,291
Income from operations 2,713 1,349 5,597 5,655
Net interest and other financial costs 310 221 933 594
Income before income taxes 2,403 1,128 4,664 5,061
Provision for income taxes 460 113 765 779
Net income 1,943 1,015 3,899 4,282
Less net income attributable to:        
Redeemable noncontrolling interest 0 6 0 21
Noncontrolling interests 573 387 1,387 1,187
Net income attributable to MPC $ 1,370 $ 622 $ 2,512 $ 3,074
Basic:        
Net income attributable to MPC per share $ 4.51 $ 1.88 $ 8.16 $ 8.85
Weighted average shares outstanding 303 331 307 347
Diluted:        
Net income attributable to MPC per share $ 4.51 $ 1.87 $ 8.15 $ 8.83
Weighted average shares outstanding 304 332 308 348
[1] Includes sales to related parties. See Note 6 for additional information. See Note 17 for the disaggregation of our revenue from external customers by segment and product line.
v3.25.3
Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net income $ 1,943 $ 1,015 $ 3,899 $ 4,282
Other comprehensive income (loss) (1) (6) 5 (27)
Comprehensive income 1,942 1,009 3,904 4,255
Less comprehensive income attributable to:        
Redeemable noncontrolling interest 0 6 0 21
Noncontrolling interests 573 387 1,387 1,187
Comprehensive income attributable to MPC 1,369 616 2,517 3,047
Actuarial changes        
Other comprehensive income (loss) 4 2 21 5
Prior service        
Other comprehensive income (loss) (6) (10) (18) (31)
Other        
Other comprehensive income (loss) $ 1 $ 2 $ 2 $ (1)
v3.25.3
Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Actuarial changes        
OCI, tax expense (benefit) $ 1 $ 1 $ 7 $ 2
Prior service        
OCI, tax expense (benefit) (2) (3) (6) (10)
Other        
OCI, tax expense (benefit) $ 0 $ 1 $ 0 $ 0
v3.25.3
Consolidated Balance Sheets - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets    
Cash and cash equivalents $ 2,654 $ 3,210
Receivables, less allowance for expected credit loss of $20 and $73, respectively 10,487 11,145
Inventories 9,829 9,568
Other current assets 626 524
Assets held for sale 1,034 0
Total current assets 24,630 24,447
Equity method investments 6,900 6,857
Property, plant and equipment, net 36,984 35,028
Goodwill 9,331 8,244
Intangibles, net 2,749 1,774
Right of use assets, net 1,373 1,300
Other noncurrent assets 1,273 1,208
Total assets 83,240 78,858
Liabilities    
Accounts payable 12,486 13,906
Payroll and benefits payable 968 1,096
Accrued taxes 1,381 1,204
Debt due within one year 1,612 3,049
Operating lease liabilities 441 417
Other current liabilities 1,610 1,155
Liabilities held for sale 230 0
Total current liabilities 18,728 20,827
Long-term debt 31,232 24,432
Deferred income taxes 5,964 5,771
Defined benefit postretirement plan obligations 1,132 1,157
Long-term operating lease liabilities 918 860
Deferred credits and other liabilities 1,377 1,305
Total liabilities 59,351 54,352
Commitments and contingencies (see Note 22)
Redeemable noncontrolling interest 0 203
Equity [Abstract]    
Preferred stock, no shares issued and outstanding (par value $0.01 per share, 30 million shares authorized) 0 0
Common stock:    
Issued – 994 million and 994 million shares (par value $0.01 per share, 2 billion shares authorized) 10 10
Held in treasury, at cost – 693 million and 678 million shares (55,016) (52,623)
Additional paid-in capital 33,695 33,624
Retained earnings 38,517 36,848
Accumulated other comprehensive loss (109) (114)
Total MPC stockholders’ equity 17,097 17,745
Noncontrolling interests 6,792 6,558
Total equity 23,889 24,303
Total liabilities, redeemable noncontrolling interest and equity $ 83,240 $ 78,858
v3.25.3
Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Sep. 30, 2025
Dec. 31, 2024
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for credit loss, current $ 20 $ 73
Preferred stock:    
Preferred stock, shares issued 0  
Preferred stock, shares outstanding 0  
Preferred stock, par or stated value per share $ 0.01  
Preferred stock, shares authorized 30  
Common stock:    
Common stock, shares, issued 994 994
Common stock, par or stated value per share $ 0.01  
Common stock, shares authorized 2,000  
Treasury stock, shares (693) (678)
v3.25.3
Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Operating activities:    
Net income $ 3,899 $ 4,282
Adjustments to reconcile net income to net cash provided by operating activities    
Amortization of deferred financing costs and debt discount 30 (44)
Depreciation and amortization 2,423 2,511
Pension and other postretirement benefits, net (36) 18
Deferred income taxes 251 (132)
Net gain on disposal of assets (4) (17)
Income from equity method investments (1,418) (796)
Distributions from equity method investments 857 882
Changes in the fair value of derivative instruments (45) 47
Changes in:    
Current receivables 706 2,061
Inventories (285) (588)
Current liabilities and other current assets (1,204) (1,546)
Right of use assets and operating lease liabilities, net 10 (1)
All other, net 0 (219)
Net cash provided by operating activities 5,184 6,458
Investing activities:    
Additions to property, plant and equipment (2,305) (1,723)
Acquisitions, net of cash acquired (3,316) (622)
Disposal of assets 20 4
Investments – acquisitions and contributions (821) (450)
Investments – redemptions, repayments, return of capital and sales proceeds 571 141
Purchases of short-term investments 0 (2,949)
Sales of short-term investments 0 2,295
Maturities of short-term investments 0 4,384
All other, net 198 147
Net cash provided by (used in) investing activities (5,653) 1,227
Financing activities:    
Commercial paper – issued 5,055 0
Commercial paper – repayments (5,055) 0
Long-term debt – borrowings 11,166 1,631
Long-term debt – repayments (6,438) (811)
Debt issuance costs (80) (15)
Issuance of common stock 24 19
Common stock repurchased (2,487) (7,815)
Dividends paid (840) (862)
Distributions to noncontrolling interests (1,104) (1,005)
Repurchases of noncontrolling interests (300) (226)
All other, net (29) (43)
Net cash used in financing activities (88) (9,127)
Net change in cash, cash equivalents and restricted cash (557) (1,442)
Cash, cash equivalents, restricted cash and restricted cash equivalents, beginning balance 3,211 [1] 5,446
Cash, cash equivalents, restricted cash and restricted cash equivalents, ending balance [1] $ 2,654 $ 4,004
[1] Restricted cash is included in other current assets on our consolidated balance sheets.
v3.25.3
Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Consolidated Statements of Equity) - USD ($)
$ in Millions
Total
Common Stock
Treasury Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Non-controlling Interests
Beginning balance at Dec. 31, 2023 $ 30,504 $ 10 $ (43,502) $ 33,465 $ 34,562 $ (131) $ 6,100
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 1,302       937   365
Dividends declared on common stock (299)       (299)    
Distributions to noncontrolling interests (314)           (314)
Other comprehensive income (loss) (12)         (12)  
Shares repurchased (2,172)   (2,172)        
Share-based compensation (9)     (7) (1)   (1)
Equity transactions of MPLX 210     72 0   138
Ending balance at Mar. 31, 2024 29,210 10 (45,674) 33,530 35,199 (143) 6,288
Beginning balance at Dec. 31, 2023 30,504 10 (43,502) 33,465 34,562 (131) 6,100
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Other comprehensive income (loss) (27)            
Equity transactions of MPLX       131      
Ending balance at Sep. 30, 2024 25,509 10 (51,320) 33,630 36,771 (158) 6,576
Beginning balance at Mar. 31, 2024 29,210 10 (45,674) 33,530 35,199 (143) 6,288
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 1,950       1,515   435
Dividends declared on common stock (290)       (290)    
Distributions to noncontrolling interests (325)           (325)
Other comprehensive income (loss) (9)         (9)  
Shares repurchased (2,918)   (2,918)        
Share-based compensation 29     26 (1)   4
Equity transactions of MPLX 239     79     160
Ending balance at Jun. 30, 2024 27,886 10 (48,592) 33,635 36,423 (152) 6,562
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 1,009       622   387
Dividends declared on common stock (273)       (273)    
Distributions to noncontrolling interests (328)           (328)
Other comprehensive income (loss) (6)         (6)  
Shares repurchased (2,728)   (2,728)        
Share-based compensation 17     15 (1)   3
Equity transactions of MPLX (68)     (20)     (48)
Ending balance at Sep. 30, 2024 25,509 10 (51,320) 33,630 36,771 (158) 6,576
Beginning balance at Dec. 31, 2024 24,303 10 (52,623) 33,624 36,848 (114) 6,558
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 346       (74)   420
Dividends declared on common stock (285)       (285)    
Distributions to noncontrolling interests (364)           (364)
Other comprehensive income (loss) 5         5  
Shares repurchased (1,039)   (1,039)        
Share-based compensation 16     19 0   (3)
Equity transactions of MPLX 83     25     58
Ending balance at Mar. 31, 2025 23,065 10 (53,662) 33,668 36,489 (109) 6,669
Beginning balance at Dec. 31, 2024 24,303 10 (52,623) 33,624 36,848 (114) 6,558
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Other comprehensive income (loss) 5            
Equity transactions of MPLX       16      
Ending balance at Sep. 30, 2025 23,889 10 (55,016) 33,695 38,517 (109) 6,792
Beginning balance at Mar. 31, 2025 23,065 10 (53,662) 33,668 36,489 (109) 6,669
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 1,610       1,216   394
Dividends declared on common stock (279)       (279)    
Distributions to noncontrolling interests (368)           (368)
Other comprehensive income (loss) 1         1  
Shares repurchased (698)   (698)        
Share-based compensation 20     19 (2)   3
Equity transactions of MPLX (87)     (29)     (58)
Ending balance at Jun. 30, 2025 23,264 10 (54,360) 33,658 37,424 (108) 6,640
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 1,943       1,370   573
Dividends declared on common stock (276)       (276)    
Distributions to noncontrolling interests (366)           (366)
Other comprehensive income (loss) (1)         (1)  
Shares repurchased (656)   (656)        
Share-based compensation 19     17 (1)   3
Equity transactions of MPLX (38)     20     (58)
Ending balance at Sep. 30, 2025 $ 23,889 $ 10 $ (55,016) $ 33,695 $ 38,517 $ (109) $ 6,792
v3.25.3
Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Shares of Common Stock) - shares
shares in Millions
Total
Common Stock
Beginning balance at Dec. 31, 2023   993
Number of common shares issued - stock compensation   0
Ending balance at Mar. 31, 2024   993
Number of common shares issued - stock compensation   1
Ending balance at Jun. 30, 2024   994
Number of common shares issued - stock compensation   0
Ending balance at Sep. 30, 2024   994
Beginning balance at Dec. 31, 2024 994 994
Number of common shares issued - stock compensation   0
Ending balance at Mar. 31, 2025   994
Number of common shares issued - stock compensation   0
Ending balance at Jun. 30, 2025   994
Number of common shares issued - stock compensation   0
Ending balance at Sep. 30, 2025 994 994
v3.25.3
Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Shares of Treasury Stock) - shares
shares in Millions
Total
Treasury Stock
Beginning balance at Dec. 31, 2023   (625)
Number of shares repurchased   (13)
Ending balance at Mar. 31, 2024   (638)
Beginning balance at Dec. 31, 2023   (625)
Number of shares repurchased (44)  
Ending balance at Sep. 30, 2024   (669)
Beginning balance at Mar. 31, 2024   (638)
Number of shares repurchased   (15)
Ending balance at Jun. 30, 2024   (653)
Number of shares repurchased (16) (16)
Ending balance at Sep. 30, 2024   (669)
Beginning balance at Dec. 31, 2024 (678) (678)
Number of shares repurchased   (7)
Ending balance at Mar. 31, 2025   (685)
Beginning balance at Dec. 31, 2024 (678) (678)
Number of shares repurchased (15)  
Ending balance at Sep. 30, 2025 (693) (693)
Beginning balance at Mar. 31, 2025   (685)
Number of shares repurchased   (5)
Ending balance at Jun. 30, 2025   (690)
Number of shares repurchased (3) (3)
Ending balance at Sep. 30, 2025 (693) (693)
v3.25.3
Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Redeemable Noncontrolling Interest) - USD ($)
$ in Millions
Total
Redeemable Non-controlling Interest
Beginning balance at Dec. 31, 2023   $ 895
Net income attributable to redeemable noncontrolling interest   10
Distributions to noncontrolling interests   (23)
Equity transactions of MPLX   (321)
Ending balance at Mar. 31, 2024   561
Beginning balance at Dec. 31, 2023   895
Net income attributable to redeemable noncontrolling interest $ 21  
Ending balance at Sep. 30, 2024   203
Beginning balance at Mar. 31, 2024   561
Net income attributable to redeemable noncontrolling interest   5
Distributions to noncontrolling interests   (10)
Equity transactions of MPLX   (354)
Ending balance at Jun. 30, 2024   202
Net income attributable to redeemable noncontrolling interest 6 6
Distributions to noncontrolling interests   (5)
Ending balance at Sep. 30, 2024   203
Beginning balance at Dec. 31, 2024 203 203
Net income attributable to redeemable noncontrolling interest   0
Distributions to noncontrolling interests   (6)
Equity transactions of MPLX   (197)
Ending balance at Mar. 31, 2025   0
Beginning balance at Dec. 31, 2024 203 203
Net income attributable to redeemable noncontrolling interest 0  
Ending balance at Sep. 30, 2025 0 0
Beginning balance at Mar. 31, 2025   0
Net income attributable to redeemable noncontrolling interest   0
Distributions to noncontrolling interests   0
Equity transactions of MPLX   0
Ending balance at Jun. 30, 2025   0
Net income attributable to redeemable noncontrolling interest 0 0
Distributions to noncontrolling interests   0
Ending balance at Sep. 30, 2025 $ 0 $ 0
v3.25.3
Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Parenthetical) - $ / shares
 3 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Statement of Stockholders' Equity [Abstract]            
Dividends declared per share of common stock (in dollars per share) $ 0.91 $ 0.91 $ 0.91 $ 0.825 $ 0.825 $ 0.825
v3.25.3
Description of the Business and Basis of Presentation
 9 Months Ended
Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Description of the Business and Basis of Presentation Description of the Business and Basis of Presentation
Description of the Business
We are a leading, integrated, downstream and midstream energy company headquartered in Findlay, Ohio. We operate one of the nation's largest refining systems. We sell refined products to wholesale marketing customers domestically and internationally, to buyers on the spot market and to independent entrepreneurs who operate branded outlets. We also sell transportation fuel to consumers through direct dealer locations under long-term supply contracts. MPC’s midstream operations are primarily conducted through MPLX, which owns and operates crude oil and light product transportation and logistics infrastructure as well as gathering, processing and fractionation assets. We own the general partner and a majority limited partner interest in MPLX. In addition, we produce and market renewable diesel in the United States.
Refer to Notes 3 and 9 for additional information about our operations.
Basis of Presentation
These interim consolidated financial statements are unaudited; however, in the opinion of our management, these statements reflect all adjustments necessary for a fair statement of the results for the periods reported. All such adjustments are of a normal, recurring nature unless otherwise disclosed. These interim consolidated financial statements, including the notes, have been prepared in accordance with the rules of the SEC applicable to interim period financial statements and do not include all of the information and disclosures required by GAAP for complete financial statements. Certain information and disclosures derived from our audited annual financial statements, prepared in accordance with GAAP, have been condensed or omitted from these interim financial statements.
These interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2024. The results of operations for the three and nine months ended September 30, 2025 are not necessarily indicative of the results to be expected for the full year.
These consolidated financial statements include the accounts of our majority-owned, controlled subsidiaries, including MPLX. All significant intercompany transactions and accounts have been eliminated. Due to our ownership of the general partner interest of MPLX, we have determined that we control MPLX and therefore we consolidate MPLX and record a noncontrolling interest for the interest owned by the public. Changes in ownership interest in consolidated subsidiaries that do not result in a change in control are recorded as equity transactions. Investments in entities over which we have significant influence, but not control, are accounted for using the equity method of accounting. This includes entities in which we hold majority ownership but the minority shareholders have substantive participating rights.
Certain prior period financial statement amounts have been reclassified to conform to current period presentation.
In the fourth quarter of 2024, we established a Renewable Diesel segment, which includes renewable diesel activities historically reported in the Refining & Marketing segment. Prior period segment information has been recast for comparability. See Notes 9 and 17 for prior period recast information.
Basis of Accounting
These interim consolidated financial statements are unaudited; however, in the opinion of our management, these statements reflect all adjustments necessary for a fair statement of the results for the periods reported. All such adjustments are of a normal, recurring nature unless otherwise disclosed. These interim consolidated financial statements, including the notes, have been prepared in accordance with the rules of the SEC applicable to interim period financial statements and do not include all of the information and disclosures required by GAAP for complete financial statements. Certain information and disclosures derived from our audited annual financial statements, prepared in accordance with GAAP, have been condensed or omitted from these interim financial statements.
v3.25.3
Accounting Standards
 9 Months Ended
Sep. 30, 2025
Accounting Standards Update and Change in Accounting Principle [Abstract]  
Accounting Standards Accounting Standards
Not Yet Adopted
ASU 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40)
In September 2025, the FASB issued ASU 2025-06 to modernize the accounting for software costs that are accounted for under ASC 350-40 by removing all references to prescriptive and sequential software development stages and requiring entities to begin capitalizing software costs when both management has authorized and committed to the funding of the software project, and it is probable that the project will be completed and the software will be used to perform its intended function. This ASU also provides enhanced guidance on evaluating whether the probable-to-complete recognition threshold has been met. This ASU is effective for fiscal years beginning after December 15, 2027. Early adoption is permitted. The amendments in this ASU may be applied either (1) prospectively to all projects started in reporting periods after adoption, including in-process projects, (2) on a modified transition basis that is based on the status of the project and whether software costs were capitalized before the date of adoption, or (3) retrospectively to all prior periods presented in the financial statements. We will adopt this ASU on a prospective basis and do not expect material impacts to our capitalized software cost.
ASU 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses
In November 2024, the FASB issued an ASU to require more detailed information about specified categories of expenses (purchases of inventory, employee compensation, depreciation, amortization, and depletion) included in certain expense captions presented on the face of the income statement. This ASU is effective for fiscal years beginning after December 15, 2026, and for interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. The amendments in this ASU may be applied either (1) prospectively to financial statements issued for reporting periods after the effective date of this ASU or (2) retrospectively to all prior periods presented in the financial statements. We are currently evaluating the impact this ASU will have on our disclosures.
ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures
In December 2023, the FASB issued an ASU to update income tax disclosure requirements to provide consistent categories and greater disaggregation of information in the rate reconciliation and to disaggregate income taxes paid by jurisdiction. This ASU is effective for fiscal years beginning after December 15, 2024. Early adoption is permitted. The amendments in this ASU should be applied on a prospective basis, but retrospective application is permitted. We will adopt this ASU on a retrospective basis and it will result in additional disclosure.
v3.25.3
Master Limited Partnership
 9 Months Ended
Sep. 30, 2025
Noncontrolling Interest [Abstract]  
Master Limited Partnership Master Limited Partnership
We own the general partner and a majority limited partner interest in MPLX, which owns and operates crude oil and light product transportation and logistics infrastructure as well as gathering, processing and fractionation assets. We control MPLX through our ownership of the general partner interest and, as of September 30, 2025, we owned approximately 64 percent of the outstanding MPLX common units.
Unit Repurchase Program
On August 5, 2025, MPLX announced its board of directors approved a $1.0 billion unit repurchase authorization in addition to the $1.0 billion unit repurchase authorization announced on August 2, 2022. These unit repurchase authorizations have no expiration date. MPLX may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, accelerated unit repurchases, tender offers or open market solicitations for units, some of which may be effected through Rule 10b5-1 plans. The timing and amount of future repurchases, if any, will depend upon several factors, including market and business conditions, and such repurchases may be suspended, discontinued or restarted at any time.
Total unit repurchases were as follows for the respective periods:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(In millions, except per unit data)2025202420252024
Number of common units repurchased2 2 6 6 
Cash paid for common units repurchased$100 $76 $300 $226 
Average cost per unit$50.86 $42.89 $51.20 $41.32 
As of September 30, 2025, MPLX had approximately $1.22 billion remaining under its unit repurchase authorizations.
Preferred Units
The Series A preferred units are considered redeemable securities under GAAP due to the existence of redemption provisions upon a deemed liquidation event, which is outside MPLX’s control. Therefore, they are presented as temporary equity in the mezzanine section of our consolidated balance sheets.
During 2023 and 2024, certain Series A preferred unitholders exercised their rights to convert their Series A preferred units into common units. Approximately 6 million Series A preferred units were outstanding as of December 31, 2024. On February 11, 2025, MPLX exercised its right to convert the remaining outstanding Series A preferred units into common units.
For a summary of changes in the redeemable preferred balance, see the accompanying consolidated statements of equity and redeemable noncontrollable interest.
Agreements
We have various long-term, fee-based commercial agreements with MPLX. Under these agreements, MPLX provides transportation, storage, distribution and marketing services to us. With certain exceptions, these agreements generally contain minimum volume commitments. These transactions are eliminated in consolidation but are reflected as intersegment transactions among our Refining & Marketing, Renewable Diesel and Midstream segments. We also have agreements with
MPLX that establish fees for operational and management services provided between us and MPLX and for executive management services and certain general and administrative services provided by us to MPLX. These transactions are eliminated in consolidation but are reflected as intersegment transactions between corporate and our Midstream segment.
Noncontrolling Interest
As a result of equity transactions of MPLX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interests in MPLX were as follows:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Increase (decrease) due to change in ownership$(42)$(29)$(45)$198 
Tax impact62 9 61 (67)
Increase (decrease) in MPC's additional paid-in capital, net of tax$20 $(20)$16 $131 
v3.25.3
Acquisitions and Other Transacations
 9 Months Ended
Sep. 30, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]  
Acquisitions and Other Transactions Acquisitions and Other Transactions
Northwind Midstream Acquisition
On August 29, 2025, MPLX completed the acquisition of 100 percent of Northwind Delaware Holdings LLC (“Northwind Midstream”) for $2.4 billion in cash (the “Northwind Midstream Acquisition”). Northwind Midstream provides sour gas gathering and treating services in Lea County, New Mexico, which enhances MPLX’s Permian natural gas and NGL value chain. The Northwind Midstream Acquisition was financed with the net proceeds from MPLX's $4.5 billion senior notes issuance in August 2025.
Northwind Midstream consists of over 200,000 dedicated acres, more than 200 miles of gathering pipelines, two in-service acid gas injection wells at 20 MMcf/d and a third permitted well that will bring its total capacity to 37 MMcf/d. At the time of acquisition, the system had 150 MMcf/d of sour gas treating capacity, with in-process expansion projects expected to increase capacity to over 400 MMcf/d by the second half of 2026. The system is supported by minimum volume commitments by regional producers.
The Northwind Midstream Acquisition was accounted for as a business combination requiring all Northwind Midstream assets and liabilities to be remeasured to fair value. The fair value of property, plant and equipment was based primarily on the cost approach. The fair value of the identifiable intangible assets was primarily based on the multi-period excess earnings method, which is an income approach. The intangible assets acquired are related to various commercial contracts with a weighted average amortization period of 15 years. The following table reflects our preliminary allocation of the $2.4 billion purchase price to the Northwind Midstream assets and liabilities:
(In millions)August 29,
2025
Assets acquired:
Cash and cash equivalents$17 
Receivables11 
Other current assets1 
Property, plant and equipment1,182 
Intangibles951 
Other noncurrent assets2 
Total assets acquired2,164 
Liabilities assumed:
Accounts payable105 
Other current liabilities1 
Long-term operating lease liabilities1 
Total liabilities assumed107 
Total identifiable net assets2,057 
Goodwill356 
Fair value of net assets acquired$2,413 
The allocation is subject to revision, as certain data necessary to complete the purchase price allocation is not yet available, including, but not limited to, the final valuation of property, plant and equipment and intangible assets acquired, which may impact the amount of goodwill recognized. The final valuation will be completed no later than one year from the acquisition date. The results for the acquired business are reported within our Midstream segment.
The purchase price allocation resulted in the recognition of $356 million in goodwill by our Midstream segment, all of which is deductible by MPLX for tax purposes. Goodwill represents the accelerated growth opportunities in the Permian using Northwind Midstream’s asset base, which is complementary and adjacent to MPLX’s existing Delaware basin natural gas system and offers optionality to direct volumes through our integrated system.
Pro forma financial information assuming the Northwind Midstream Acquisition had occurred as of the beginning of the calendar year prior to the year of the acquisition, as well as the revenues and earnings generated during the period since the acquisition date, were not material for disclosure purposes.
Announced Divestiture of Rockies Operations
On August 26, 2025, MPLX entered into a definitive agreement to divest its Rockies gathering and processing operations (the “Rockies”) to a subsidiary of Harvest Midstream (“Harvest”) for $1.0 billion in cash, subject to customary purchase price adjustments.
The assets and liabilities to be sold as part of this transaction are shown on the consolidated balance sheet as assets held for sale and liabilities held for sale, respectively, as of September 30, 2025. Upon classification as held for sale, depreciation and amortization of the assets ceased. Since the sale of these operations does not represent a strategic shift that has or will have a material effect on our operations or financial results, the planned divestiture is not considered to be a discontinued operation. The Rockies operations are currently reported within the Midstream segment.
The transaction is expected to close in the fourth quarter of 2025, subject to customary closing conditions, and is expected to result in an estimated gain in excess of $150 million upon closing.
The following table presents the carrying value of assets and liabilities as presented within assets and liabilities held for sale on our consolidated balance sheets as of September 30, 2025:
(In millions)September 30,
2025
Assets
Receivables, less allowance for expected credit loss$28 
Inventories25 
Equity method investments123 
Property, plant and equipment, net of accumulated depreciation of $340
788 
Intangibles, net of accumulated amortization of $178
68 
Right of use assets, net2 
Total assets classified as held for sale$1,034 
Liabilities
Accounts payable$27 
Accrued taxes3 
Operating lease liabilities1 
Other current liabilities16 
Long-term operating lease liabilities1 
Deferred credits and other liabilities182 
Total liabilities classified as held for sale$230 
Sale of Interest in Ethanol Joint Venture
On July 31, 2025, MPC sold its 49.9 percent interest in The Andersons Marathon Holdings LLC (“TAMH”) to The Andersons Ethanol LLC, in exchange for cash proceeds of $427 million. MPC’s equity method investment in TAMH was previously reported in the Refining & Marketing segment. Upon closing, MPC derecognized the carrying value of the equity method investment of $173 million and recorded a gain of $254 million, which is included in income from equity method investments on the accompanying consolidated statements of income.
BANGL, LLC Acquisitions
BANGL, LLC (“BANGL”) owns and operates an NGL pipeline system that connects production in the Delaware and Midland basins to key demand centers along the Gulf Coast. On July 31, 2024, MPLX exercised its right of first offer under the BANGL joint venture agreement to purchase an additional 20 percent ownership interest in BANGL for $210 million in cash, which increased total ownership interest to 45 percent (the “2024 BANGL Transaction”). The purchase price of the additional 20 percent ownership interest in BANGL exceeded MPLX’s portion of the underlying net assets of the joint venture by approximately $156 million. Following the 2024 BANGL Transaction, MPLX’s investment in BANGL continued to be accounted for as an equity method investment.
On July 1, 2025, MPLX purchased the remaining 55 percent interest in BANGL for $703 million in cash, plus an earnout provision of up to $275 million based on targeted EBITDA growth from 2026 to 2029 (the “BANGL Acquisition”). We recorded a liability for these contingent payments in the third quarter of 2025. See Note 14 for additional detail on the inputs used to measure the fair value of these contingent payments. On July 3, 2025, MPLX used cash on hand to extinguish approximately $656 million principal amount of debt outstanding, including interest, related to certain term and revolving loans assumed as part of the BANGL Acquisition (the “BANGL Debt Repayment”).
Upon acquisition of the remaining 55 percent interest in BANGL, MPLX’s existing equity investment was remeasured to fair value resulting in the recognition of a $484 million gain, which is included in income from equity method investments within the accompanying consolidated statements of income. The fair value of the previously held equity method investment was estimated using an income approach, with significant valuation inputs including forecasted cash flows and discount rates ranging from 11 to 12 percent. As a result of the BANGL Acquisition, MPLX now owns 100 percent of BANGL and its results are reflected in our Midstream segment within our consolidated financial results.
The following table summarizes the purchase price consideration in connection with the BANGL Acquisition:
(In millions)
Total cash paid$703 
Fair value of contingent consideration as of acquisition date234 
Total consideration937 
Fair value of previously held equity interest766 
Fair value of net assets acquired$1,703 
The BANGL Acquisition was accounted for as a business combination requiring all BANGL assets and liabilities to be remeasured to fair value. The fair value of property, plant and equipment was determined using a combination of both the cost and income approach. The fair value of the identifiable intangible assets was primarily based on the multi-period excess earnings method, which is an income approach. The intangible asset acquired is related to a customer relationship with an amortization period of 11 years. The following table reflects our preliminary determination of the fair value of the BANGL assets and liabilities:
(In millions)July 1,
2025
Assets acquired:
Cash and cash equivalents$18 
Other current assets4 
Property, plant and equipment1,550 
Intangibles77 
Other noncurrent assets22 
Total assets acquired1,671 
Liabilities assumed:
Long-term debt due within one year46 
Other current liabilities42 
Long-term debt610 
Other long-term liabilities1 
Total liabilities assumed699 
Total identifiable net assets972 
Goodwill731 
Fair value of net assets acquired$1,703 
The allocation is subject to revision, as certain data necessary to complete the purchase price allocation is not yet available, including, but not limited to, the final valuation of property, plant and equipment and intangible assets acquired, which may impact the amount of goodwill recognized. The final valuation will be completed no later than one year from the acquisition date.
The purchase price allocation resulted in the recognition of $731 million in goodwill by our Midstream segment, 55 percent of which is deductible by MPLX for tax purposes. Goodwill represents the advancement of MPLX’s wellhead-to-water strategy by securing full ownership of a strategically located NGL transport asset which further integrates MPLX’s midstream infrastructure connecting the Permian and Gulf Coast regions.
Pro forma financial information assuming the BANGL Acquisition had occurred as of the beginning of the calendar year prior to the year of the acquisition, as well as the revenues and earnings generated during the period since the acquisition date, were not material for disclosure purposes.
Whiptail Midstream Acquisition
On March 11, 2025, MPLX acquired gathering businesses from Whiptail Midstream, LLC for $237 million in cash. These San Juan basin assets consist primarily of crude and natural gas gathering systems in the Four Corners region. The acquisition was accounted for as a business combination, which requires all the identifiable assets acquired and liabilities assumed to be remeasured to fair value at the date of acquisition. The preliminary determination of the fair value includes $172 million of property, plant and equipment, $41 million of intangibles and $24 million of net working capital. The allocation is subject to revision, as certain data necessary to complete the purchase price allocation is not yet available, including, but not limited to, the final valuation of assets acquired and liabilities assumed. The final valuation will be completed no later than one year from the acquisition date. The results for the acquired business are reported within our Midstream segment.
Whistler Joint Venture Transaction
On May 29, 2024, MPLX and its joint venture partner contributed their respective membership interests in Whistler Pipeline, LLC to a newly formed joint venture, WPC Parent, LLC, and issued a 19 percent voting interest in WPC Parent, LLC to an affiliate of Enbridge Inc. in exchange for the contribution of cash and the Rio Bravo Pipeline project (collectively the “Whistler Joint Venture Transaction”). As a result of the transaction, MPLX’s voting interest in the joint venture was reduced from 37.5 percent to 30.4 percent. MPLX recognized a gain of $151 million at closing and received a cash distribution of $134 million, recorded as a return of capital, related to the dilution of the ownership interest. The gain is included in income from equity method investments on the accompanying consolidated statements of income and the return of capital is included in investments - redemptions, repayments, return of capital and sales proceeds within the investing section of the accompanying consolidated statements of cash flows.
Utica Midstream Acquisition
On March 22, 2024, MPLX used $625 million of cash to purchase additional ownership interests in existing joint ventures and gathering assets, which will enhance MPLX’s position in the Utica basin. Prior to the acquisition, MPLX owned an indirect interest in Ohio Gathering Company, L.L.C. (“OGC”) and a direct interest in Ohio Condensate Company, L.L.C. (“OCC”). After giving effect to the acquisition, MPLX owns a combined direct and indirect 73 percent interest in OGC and a 100 percent interest in OCC. In addition, MPLX acquired a 100 percent interest in a dry gas gathering system in the Utica basin. OGC continues to be accounted for as an equity method investment as MPLX did not obtain control of OGC as a result of the transaction. OGC is considered a VIE and MPLX is not deemed to be the primary beneficiary due to voting rights on significant matters. The acquisition date fair value of our investment in OGC exceeded our portion of the underlying net assets of the joint venture by approximately $75 million. This basis difference is being amortized into net income over the remaining estimated useful lives of the underlying net assets. OCC was previously accounted for as an equity method investment, and it is now consolidated and included in our consolidated financial results.
The acquisition was accounted for as a business combination requiring all the acquired assets and liabilities to be remeasured to fair value resulting in a consolidated fair value of net assets and liabilities of $625 million. The fair value includes $507 million related to acquired interests in the joint ventures and the remaining balance related to other acquired assets and liabilities. The revaluation of MPLX’s existing 62 percent equity method investment in OCC resulted in a $20 million gain, which is included in net gain on disposal of assets on the accompanying consolidated statements of income. The fair value of equity method investments was based on a discounted cash flow model.
v3.25.3
Variable Interest Entities
 9 Months Ended
Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Variable Interest Entities Variable Interest Entities
Consolidated VIE
We control MPLX through our ownership of its general partner. MPLX is a VIE because the limited partners do not have substantive kick-out or participating rights over the general partner. We are the primary beneficiary of MPLX because in addition to our significant economic interest, we also have the ability, through our ownership of the general partner, to control the decisions that most significantly impact MPLX. We therefore consolidate MPLX and record a noncontrolling interest for the interest owned by the public.
The creditors of MPLX do not have recourse to MPC’s general credit or assets through guarantees or other financial arrangements, except as otherwise noted. MPC has effectively guaranteed certain indebtedness of LOOP LLC (“LOOP”) and LOCAP LLC (“LOCAP”), in which MPLX holds an interest. See Note 22 for more information. The assets of MPLX can only be used to settle its own obligations and any rights of MPC’s creditors to participate in the assets of MPLX are subject to prior claims of MPLX’s creditors.
The following table presents balance sheet information for the assets and liabilities of MPLX, which are included in our consolidated balance sheets.
(Millions of dollars)September 30,
2025		December 31,
2024
Assets
Cash and cash equivalents$1,765 $1,519 
Receivables, less allowance for expected credit loss741 731 
Inventories175 180 
Other current assets38 29 
Assets held for sale1,034 — 
Equity method investments4,792 4,531 
Property, plant and equipment, net21,348 19,154 
Goodwill8,732 7,645 
Intangibles, net1,443 518 
Right of use assets, net276 273 
Other noncurrent assets1,060 995 
Liabilities
Accounts payable$859 $719 
Accrued taxes112 82 
Debt due within one year1,501 1,693 
Operating lease liabilities49 45 
Other current liabilities426 370 
Liabilities held for sale230 — 
Long-term debt24,145 19,255 
Deferred income taxes20 18 
Long-term operating lease liabilities220 217 
Deferred credits and other liabilities479 445 
v3.25.3
Related Party Transactions
 9 Months Ended
Sep. 30, 2025
Related Party Transactions [Abstract]  
Related Party Transactions Related Party Transactions
Transactions with related parties were as follows:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Sales to related parties$390 $213 $1,036 $711 
Purchases from related parties751 624 2,163 1,778 
Sales to related parties, which are included in sales and other operating revenues, consist primarily of refined product sales and renewable feedstock sales to certain of our equity affiliates.
Purchases from related parties are included in cost of revenues. We obtain utilities, transportation services and purchase renewable diesel from certain of our equity affiliates.
We also purchased ethanol from TAMH, an equity affiliate. On July 31, 2025, MPC sold its interest in TAMH. TAMH ceased to be a related party after the sale. See Note 4.
v3.25.3
Earnings Per Share
 9 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Earnings per Share Earnings Per Share
We compute basic earnings per share by dividing net income attributable to MPC less income allocated to participating securities by the weighted average number of shares of common stock outstanding. Since MPC grants certain incentive compensation awards to employees and non-employee directors that are considered to be participating securities, we have calculated our earnings per share using the two-class method. Diluted income per share assumes exercise of certain share-based compensation awards, provided the effect is not anti-dilutive.
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(In millions, except per share data)2025202420252024
Basic earnings per share:
Allocation of earnings
Net income attributable to MPC$1,370 $622 $2,512 $3,074 
Income allocated to participating securities(2)— (3)(2)
Income available to common stockholders - basic$1,368 $622 $2,509 $3,072 
Weighted average common shares outstanding303 331 307 347 
Basic earnings per share$4.51 $1.88 $8.16 $8.85 
Diluted earnings per share:
Allocation of earnings
Net income attributable to MPC$1,370 $622 $2,512 $3,074 
Income allocated to participating securities(2)— (3)(2)
Income available to common stockholders - diluted$1,368 $622 $2,509 $3,072 
Weighted average common shares outstanding303 331 307 347 
Effect of dilutive securities1 1 1 1 
Weighted average common shares, including dilutive effect304 332 308 348 
Diluted earnings per share$4.51 $1.87 $8.15 $8.83 
Potential common shares that were anti-dilutive and, therefore, omitted from the diluted share calculation, were immaterial for all periods.
v3.25.3
Equity
 9 Months Ended
Sep. 30, 2025
Equity [Abstract]  
Equity Equity
On November 5, 2024, MPC announced that our board of directors approved a $5.0 billion share repurchase authorization in addition to the $5.0 billion share repurchase authorization announced on April 30, 2024. As of September 30, 2025, $5.38 billion remained available for repurchase under the share repurchase authorizations. These share repurchase authorizations have no expiration date.
We may utilize various methods to effect the repurchases, which could include open market repurchases, negotiated block transactions, accelerated share repurchases, tender offers or open market solicitations for shares, some of which may be effected through Rule 10b5-1 plans. The timing and amount of future repurchases, if any, will depend upon several factors, including market and business conditions, and such repurchases may be suspended, discontinued or restarted at any time.
Total share repurchases were as follows for the respective periods:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(In millions, except per share data)2025202420252024
Number of shares repurchased3 16 15 44 
Cash paid for shares repurchased(a)
$650 $2,701 $2,399 $7,815 
Average cost per share(b)
$174.32 $170.99 $153.83 $175.20 
(a)    The nine months ended September 30, 2025 excludes $88 million paid in 2025 for excise tax on 2024 share repurchases.
(b)    The average cost per share includes excise tax on share repurchases resulting from the Inflation Reduction Act of 2022, but the excise tax does not reduce the remaining share repurchase authorization.
v3.25.3
Segment Information
 9 Months Ended
Sep. 30, 2025
Segment Reporting [Abstract]  
Segment Information Segment Information
We have three reportable segments: Refining & Marketing, Midstream and Renewable Diesel. Each of these segments is organized and managed based upon the nature of the products and services it offers.
•Refining & Marketing – refines crude oil and other feedstocks at our refineries in the Gulf Coast, Mid-Continent and West Coast regions of the United States, purchases refined products and ethanol for resale and distributes refined products through transportation, storage, distribution and marketing services provided largely by our Midstream segment. We sell refined products to wholesale marketing customers domestically and internationally, to buyers on the spot market, to independent entrepreneurs who operate primarily Marathon® branded outlets and through long-term fuel supply contracts with direct dealers who operate locations mainly under the ARCO® brand.
•Midstream – gathers, transports, stores and distributes crude oil, refined products, including renewable diesel, and other hydrocarbon-based products principally for the Refining & Marketing segment via refining logistics assets, pipelines, terminals, towboats and barges; gathers, processes and transports natural gas; and transports, fractionates, stores and markets NGLs. The Midstream segment primarily reflects the results of MPLX.
•Renewable Diesel – processes renewable feedstocks into renewable diesel, markets renewable diesel and distributes renewable products through our Midstream segment and third parties. We sell renewable diesel to wholesale marketing customers, to buyers on the spot market and through long-term supply contracts with direct dealers who operate locations mainly under the ARCO® brand.
Our chief operating decision maker (“CODM”) evaluates the performance of our segments using segment adjusted EBITDA. Our CODM is our chief executive officer. The CODM uses adjusted EBITDA by segment results when making decisions about allocating capital and personnel as part of the annual business plan process and ongoing monitoring of performance. Amounts included in income before income taxes and excluded from adjusted EBITDA include: (i) depreciation and amortization; (ii) net interest and other financial costs; (iii) turnaround expenses; and (iv) other adjustments as deemed necessary. These items are either: (i) believed to be non-recurring in nature; (ii) not believed to be allocable or controlled by the segment; or (iii) not tied to the operational performance of the segment. Assets by segment are not a measure used to assess the performance of the company by the CODM and thus are not reported in our disclosures.

Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Segment adjusted EBITDA for reportable segments
Refining & Marketing$1,762 $1,136 $4,141 $5,144 
Midstream1,709 1,628 5,070 4,837 
Renewable Diesel(56)(61)(117)(178)
Total reportable segments$3,415 $2,703 $9,094 $9,803 
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Reconciliation of segment adjusted EBITDA for reportable segments to income before income taxes
Total reportable segments$3,415 $2,703 $9,094 $9,803 
Corporate(209)(196)(627)(600)
Refining & Renewable Diesel planned turnaround costs(401)(290)(1,141)(1,121)
Renewable Diesel JV planned turnaround costs(a)
(3)— (13)— 
Gain on sale of assets(b)
738 — 738 151 
SRE57 — 57 — 
Transaction-related costs(c)
(21)— (21)— 
Depreciation and amortization(841)(846)(2,423)(2,511)
Renewable Diesel JV depreciation and amortization(a)
(22)(22)(67)(67)
Net interest and other financial costs(310)(221)(933)(594)
Income before income taxes$2,403 $1,128 $4,664 $5,061 
(a)    Represents MPC’s pro-rata share of expenses from joint ventures included in the Renewable Diesel segment.
(b)    The three and nine months ended September 30, 2025 includes gains from the BANGL Acquisition and the sale of MPC’s interest in TAMH. The nine months ended September 30, 2024 includes the gain from the Whistler Joint Venture Transaction (as defined in Note 4). See Note 4 for additional information.
(c)    Transaction-related costs include costs associated with significant transactions discussed in Note 4.

Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Sales and other operating revenues
Refining & Marketing
Revenues from external customers(a)
$32,647 $33,298 $93,932 $100,435 
Intersegment revenues7 43 53 128 
Refining & Marketing segment revenues32,654 33,341 93,985 100,563 
Midstream
Revenues from external customers(a)
1,449 1,332 4,230 3,813 
Intersegment revenues1,481 1,468 4,421 4,319 
Midstream segment revenues2,930 2,800 8,651 8,132 
Renewable Diesel
Revenues from external customers(a)
713 477 1,963 1,479 
Intersegment revenues3 4 12 18 
Renewable Diesel segment revenues716 481 1,975 1,497 
Total segment revenues36,300 36,622 104,611 110,192 
Less: intersegment revenues1,491 1,515 4,486 4,465 
Consolidated sales and other operating revenues(a)
$34,809 $35,107 $100,125 $105,727 
(a)    Includes sales to related parties. See Note 6 for additional information. See Note 17 for the disaggregation of our revenue from external customers by segment and product line.
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Income from equity method investments
Refining & Marketing$3 $29 $11 $46 
Midstream213 176 613 560 
Renewable Diesel22 14 56 39 
Total segment income from equity method investments238 219 680 645 
Corporate(a)
738 — 738 151 
Consolidated income from equity method investments$976 $219 $1,418 $796 
(a)    The three and nine months ended September 30, 2025 includes gains from the BANGL Acquisition and the sale of MPC’s interest in TAMH. The nine months ended September 30, 2024 represents the gain from the Whistler Joint Venture Transaction. See Note 4 for additional information.
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Segment expenses
Refining & Marketing
Cost of purchases$27,353 $28,883 $79,569 $85,722 
Refining operating costs1,546 1,435 4,504 4,263 
Distribution costs1,574 1,475 4,589 4,384 
Other segment items(a)
422 441 1,193 1,096 
Refining & Marketing segment expenses$30,895 $32,234 $89,855 $95,465 
Midstream
Other segment items(b)
1,434 1,348 4,194 3,855 
Midstream segment expenses$1,434 $1,348 $4,194 $3,855 
Renewable Diesel
Operating costs67 75 203 201 
Distribution costs22 16 69 67 
Other segment items(c)
705 465 1,876 1,446 
Renewable Diesel segment expenses$794 $556 $2,148 $1,714 
(a)    Other segment items for the Refining & Marketing segment include costs that are reimbursed by customers through commercial arrangements, as well as LIFO inventory adjustments.
(b)    Other segment items for the Midstream segment include operating expenses and purchased product costs. For purposes of managing the Midstream segment, the CODM is only provided consolidated Midstream expense information.
(c)    Other segment items for the Renewable Diesel segment include purchased product costs.
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Depreciation and amortization
Refining & Marketing$426 $448 $1,237 $1,345 
Midstream369 353 1,069 1,041 
Renewable Diesel(a)
17 17 53 50 
Total segment depreciation and amortization812 818 2,359 2,436 
Corporate29 28 64 75 
Consolidated depreciation and amortization$841 $846 $2,423 $2,511 
(a)    Excludes our pro-rata share of Renewable Diesel JV depreciation and amortization of $22 million, $22 million, $67 million and $67 million in the three months ended September 30, 2025 and 2024 and nine months ended September 30, 2025 and 2024, respectively, which was adjusted for purposes of arriving at Renewable Diesel segment adjusted EBITDA.
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Capital expenditures
Refining & Marketing$423 $369 $1,132 $961 
Midstream919 557 1,996 1,125 
Renewable Diesel16 3 18 6 
Total segment capital expenditures and investments1,358 929 3,146 2,092 
Less investments in equity method investees333 271 821 450 
Plus:
Corporate6 7 21 25 
Capitalized interest26 14 64 38 
Consolidated capital expenditures(a)
$1,057 $679 $2,410 $1,705 
(a)Includes changes in capital expenditure accruals. See Note 18 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the nine months ended September 30, 2025 and 2024 as reported in the consolidated statements of cash flows.
v3.25.3
Net Interest and Other Financial Costs
 9 Months Ended
Sep. 30, 2025
Other Income and Expenses [Abstract]  
Net Interest and Other Financial Costs Net Interest and Other Financial Costs
Net interest and other financial costs were as follows:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Interest income$(41)$(102)$(118)$(308)
Interest expense368 352 1,079 1,034 
Interest capitalized(27)(15)(67)(40)
Pension and other postretirement non-service costs(a)
6 (8)17 (30)
Investments - net premium (discount) amortization— (20)— (90)
Other financial costs4 14 22 28 
Net interest and other financial costs$310 $221 $933 $594 
(a)See Note 21.
v3.25.3
Income Taxes
 9 Months Ended
Sep. 30, 2025
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
We recorded a combined federal, state and foreign income tax provision of $460 million and $765 million for the three and nine months ended September 30, 2025, respectively, which was lower than the U.S. statutory rate primarily due to permanent tax benefits related to net income attributable to noncontrolling interests, partially offset by state taxes.
We recorded a combined federal, state and foreign income tax provision of $113 million and $779 million for the three and nine months ended September 30, 2024, respectively, which was lower than the U.S. statutory rate primarily due to permanent tax benefits related to net income attributable to noncontrolling interests, partially offset by state taxes.
On July 4, 2025, the “One Big Beautiful Bill Act” (the “Act”) was enacted into law. The Act contains a multitude of provisions with various effective dates, with certain provisions effective in 2025. The provisions that are currently expected to affect us include the permanent extension of certain expiring provisions of the Tax Cuts and Jobs Act, tax relief measures including 100 percent bonus depreciation for property acquired and placed in service on or after January 19, 2025, and modifications to the international tax framework. The Act’s impact is not material to our consolidated financial statements.
v3.25.3
Inventories
 9 Months Ended
Sep. 30, 2025
Inventory Disclosure [Abstract]  
Inventories Inventories
(Millions of dollars)September 30,
2025		December 31,
2024
Crude oil and other feedstocks$3,049 $3,185 
Refined products5,435 5,137 
Materials and supplies1,345 1,246 
Total$9,829 $9,568 
Inventories are carried at the lower of cost or market value. Costs of crude oil and other feedstocks and refined products are aggregated on a consolidated basis for purposes of assessing whether the LIFO cost basis of these inventories may have to be written down to market values.
v3.25.3
Property, Plant and Equipment (PP&E)
 9 Months Ended
Sep. 30, 2025
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment (PP&E)
September 30, 2025December 31, 2024
(Millions of dollars)Gross
PP&E		Accumulated DepreciationNet
PP&E		Gross
PP&E		Accumulated DepreciationNet
PP&E
Refining & Marketing$33,973 $20,129 $13,844 $32,965 $19,015 $13,950 
Midstream33,399 11,381 22,018 30,697 10,798 19,899 
Renewable Diesel969 380 589 976 338 638 
Corporate1,726 1,193 533 1,679 1,138 541 
Total$70,067 $33,083 $36,984 $66,317 $31,289 $35,028 
v3.25.3
Fair Value Measurements
 9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
Fair Values—Recurring
The following tables present assets and liabilities accounted for at fair value on a recurring basis as of September 30, 2025 and December 31, 2024 by fair value hierarchy level. We have elected to offset the fair value amounts recognized for multiple derivative contracts executed with the same counterparty, including any related cash collateral as shown below; however, fair value amounts by hierarchy level are presented on a gross basis in the following tables.
September 30, 2025
Fair Value Hierarchy
(Millions of dollars)Level 1Level 2Level 3
Netting and Collateral(a)
Net Carrying Value on Balance Sheet(b)
Collateral Pledged Not Offset
Assets:
Commodity contracts$227 $— $— $(205)$22 $42 
Liabilities:
Commodity contracts$217 $— $— $(217)$— $— 
Embedded derivatives in commodity contracts— — 51 — 51 — 
Contingent consideration, liability— — 234 — 234 — 
December 31, 2024
Fair Value Hierarchy
(Millions of dollars)Level 1Level 2Level 3
Netting and Collateral(a)
Net Carrying Value on Balance Sheet(b)
Collateral Pledged Not Offset
Assets:
Commodity contracts$139 $— $— $(132)$7 $16 
Liabilities:
Commodity contracts$144 $— $— $(144)$— $— 
Embedded derivatives in commodity contracts— — 58 — 58 — 
(a)Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of September 30, 2025, cash collateral of $12 million was netted with mark-to-market derivative liabilities. As of December 31, 2024, cash collateral of $12 million was netted with mark-to-market derivative liabilities.
(b)We have no derivative contracts which are subject to master netting arrangements reflected gross on the balance sheet.
Level 3 instruments include a liability for contingent consideration related to the BANGL Acquisition earnout provision and an embedded derivative liability for a natural gas purchase commitment embedded in a keep-whole processing agreement.
The fair value calculation for the contingent consideration liability was estimated using discounted cash flows based on a Monte Carlo simulation. Future earnout payments are tied to the achievement of EBITDA growth from 2026 to 2029, which includes the significant unobservable input of forecasted throughput volumes. The earnout payment will continue to be remeasured at fair value each quarter with changes in fair value recognized in earnings until either the EBITDA targets are met or the earnout period ends, with the total payout capped at $275 million.
The fair value calculation for the embedded derivative liability at September 30, 2025 used significant unobservable inputs including: (1) NGL prices interpolated and extrapolated due to inactive markets ranging from $0.66 to $1.30 per gallon with a weighted average of $0.79 per gallon and (2) a 100 percent probability of renewal for the five-year term of the natural gas purchase commitment and related keep-whole processing agreement. Increases or decreases in the fractionation spread result in an increase or decrease in the fair value of the embedded derivative liability.
The following is a reconciliation of the beginning and ending balances recorded for net liabilities classified as Level 3 in the fair value hierarchy.
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Beginning balance$55 $69 $58 $61 
Contingent consideration(a)
234 — 234 — 
Unrealized and realized (gain) loss included in net income(b)
(2)3 1 18 
Settlements of derivative instruments(2)(3)(8)(10)
Ending balance$285 $69 $285 $69 
The amount of total (gain) loss for the period included in earnings attributable to the change in unrealized (gain) loss relating to liabilities still held at the end of period(b):
$(2)$3 $1 $15 
(a)    Liability recorded in the third quarter of 2025 related to the BANGL Acquisition earnout provision.
(b)    The (gain) loss is included in cost of revenues on the consolidated statements of income.
Fair Values – Reported
We believe the carrying value of our other financial instruments, including cash and cash equivalents, receivables, accounts payable and certain accrued liabilities, approximate fair value. Our fair value assessment incorporates a variety of considerations, including the short-term duration of the instruments, historical incurrence of credit losses and expected insignificance of future credit losses, which includes an evaluation of counterparty credit risk. The borrowings under our revolving credit facilities, which include variable interest rates, approximate fair value. The fair value of our long-term debt is based on prices from recent trade activity and is categorized in level 3 of the fair value hierarchy. The carrying and fair values of our debt were approximately $32.4 billion and $31.1 billion at September 30, 2025, respectively, and approximately $26.9 billion and $25.0 billion at December 31, 2024, respectively. These carrying and fair values of our debt exclude the unamortized issuance costs, which are netted against our total debt.
v3.25.3
Derivatives
 9 Months Ended
Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivatives Derivatives
For further information regarding the fair value measurement of derivative instruments, including any effect of master netting agreements or collateral, see Note 14. We do not designate any of our commodity derivative instruments as hedges for accounting purposes.
Derivatives that are not designated as accounting hedges may include commodity derivatives used to hedge price risk on (1) inventories, (2) fixed price sales of refined products, (3) the acquisition of foreign-sourced crude oil, (4) the acquisition of ethanol for blending with refined products, (5) the sale of NGLs, (6) the purchase of natural gas and (7) the purchase of soybean oil.
The following table presents the fair value of derivative instruments as of September 30, 2025 and December 31, 2024 and the line items in the consolidated balance sheets in which the fair values are reflected. The fair value amounts below are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under the terms of our master netting arrangements including cash collateral on deposit with, or received from, brokers. We offset the recognized fair value amounts for multiple derivative instruments executed with the same counterparty in our financial statements when a legal right of offset exists. As a result, the asset and liability amounts below will not agree with the amounts presented in our consolidated balance sheets.

(Millions of dollars)September 30, 2025December 31, 2024
Balance Sheet LocationAssetLiabilityAssetLiability
Commodity derivatives
Other current assets$227 $217 $139 $144 
Other current liabilities(a)
— 8 — 10 
Deferred credits and other liabilities(a)
— 43 — 48 
(a)     Includes embedded derivatives.
The table below summarizes open commodity derivative contracts for crude oil, refined products, blending products and soybean oil as of September 30, 2025.
Percentage of contracts
that expire next quarter		Position
(Units in thousands of barrels)LongShort
Exchange-traded(a)
Crude oil86.4%55,815 55,891 
Refined products91.7%35,257 41,523 
Blending products79.2%9,697 12,003 
Soybean oil98.5%2,197 2,981 
(a)    Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 6,910 long and 6,976 short and Refined products - 2,283 long and 2,661 short. There are no spread contracts for Blending products or Soybean oil.

The following table summarizes the effect of all commodity derivative instruments in our consolidated statements of income: 
Gain (Loss)
(Millions of dollars)Three Months Ended 
September 30,		Nine Months Ended 
September 30,
Income Statement Location2025202420252024
Sales and other operating revenues$— $4 $— $2 
Cost of revenues(6)38 (42)(82)
Other income2 (1)5 (2)
Total$(4)$41 $(37)$(82)
v3.25.3
Debt
 9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Debt Debt
Our outstanding borrowings at September 30, 2025 and December 31, 2024 consisted of the following:
(Millions of dollars)September 30,
2025		December 31,
2024
MPC:
Senior notes$6,449 $5,699 
MARAD debt161 174 
Finance lease obligations665 718 
Total7,275 6,591 
MPLX:
Senior notes26,000 21,200 
Finance lease obligations7 6 
Total26,007 21,206 
Total debt33,282 27,797 
Unamortized debt issuance costs(210)(142)
Unamortized discount, net of unamortized premium(228)(174)
Amounts due within one year(1,612)(3,049)
Total long-term debt due after one year$31,232 $24,432 

MPC Senior Notes
On February 10, 2025, MPC issued $2.0 billion in aggregate principal amount of senior notes in an underwritten public offering (“2025 Senior Notes Offering”), consisting of:
•$1.1 billion aggregate principal amount of 5.150 percent senior notes due March 2030; and
•$900 million aggregate principal amount of 5.700 percent senior notes due March 2035.
The 2025 Senior Notes Offering replaced the $750 million aggregate principal amount of 3.625 percent senior notes that matured in September 2024, and the net proceeds were used to repay the $1.250 billion aggregate principal amount of 4.700 percent senior notes at maturity on May 1, 2025.
MPLX Senior Notes
On February 18, 2025, MPLX repaid all of MPLX's outstanding $500 million aggregate principal amount of 4.000 percent senior notes due February 2025 at maturity.
On March 10, 2025, MPLX issued $2.0 billion in aggregate principal amount of senior notes in an underwritten public offering (“March 2025 MPLX Senior Notes Offering”), consisting of:
•$1.0 billion aggregate principal amount of 5.400 percent senior notes due April 2035; and
•$1.0 billion aggregate principal amount of 5.950 percent senior notes due April 2055.
On April 9, 2025, MPLX used a portion of the net proceeds from the March 2025 MPLX Senior Notes Offering to redeem all of (i) MPLX LP’s outstanding $1,189 million aggregate principal amount of 4.875 percent senior notes due June 2025 and (ii) MarkWest Energy Partners, L.P.’s outstanding $11 million aggregate principal amount of 4.875 percent senior notes due June 2025. MPLX used the remaining net proceeds for general partnership purposes.
On August 11, 2025, MPLX issued $4.5 billion in aggregate principal amount of senior notes in an underwritten public offering (“August 2025 MPLX Senior Notes Offering”), consisting of:
•$1.25 billion aggregate principal amount of 4.800 percent senior notes due February 2031;
•$750 million aggregate principal amount of 5.000 percent senior notes due January 2033;
•$1.5 billion aggregate principal amount of 5.400 percent senior notes due September 2035; and
•$1.0 billion aggregate principal amount of 6.200 percent senior notes due September 2055.
MPLX used a portion of the net proceeds from the August 2025 MPLX Senior Notes Offering to fund the Northwind Midstream Acquisition, including the payment of related fees and expenses, and to increase cash and cash equivalents following the
recently completed BANGL Acquisition and BANGL Debt Repayment. MPLX intends to use the remainder of the net proceeds from the August 2025 MPLX Senior Notes Offering for general partnership purposes, which may include incremental capital expenditures associated with Northwind Midstream in-process expansion projects and working capital requirements.
Capacity under our Credit Facilities as of September 30, 2025
(Millions of dollars)Total
Capacity		Outstanding
Borrowings		Outstanding
Letters
of Credit		Available
Capacity		Weighted
Average
Interest
Rate		Expiration
MPC, excluding MPLX
MPC bank revolving credit facility$5,000 $— $1 $4,999 — %July 2027
MPC trade receivables securitization facility(a)
100 — — 100 — %September 2027
MPLX
MPLX bank revolving credit facility2,000 — — 2,000 — %July 2027
(a)    The committed borrowing and letter of credit issuance capacity under the trade receivables securitization facility is $100 million. In addition, the facility allows for the issuance of letters of credit in excess of the committed capacity at the discretion of the issuing banks.
v3.25.3
Revenue
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
The following table presents our revenues from external customers disaggregated by segment and product line:

Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Refining & Marketing
Refined products$30,525 $30,987 $87,897 $93,329 
Crude oil1,586 1,826 4,570 5,713 
Services and other536 485 1,465 1,393 
Total revenues from external customers32,647 33,298 93,932 100,435 
Midstream
Refined products527 431 1,529 1,197 
Services and other922 901 2,701 2,616 
Total revenues from external customers1,449 1,332 4,230 3,813 
Renewable Diesel
Refined products709 475 1,953 1,474 
Services and other4 2 10 5 
Total revenues from external customers713 477 1,963 1,479 
Sales and other operating revenues$34,809 $35,107 $100,125 $105,727 
We do not disclose information on the future performance obligations for any contract with expected duration of one year or less at inception. As of September 30, 2025, we do not have future performance obligations that are material to future periods.
Receivables
On the accompanying consolidated balance sheets, receivables, less allowance for expected credit loss primarily consists of customer receivables. Significant, non-customer balances included in our receivables at September 30, 2025 include matching buy/sell receivables of $3.91 billion.
v3.25.3
Supplemental Cash Flow Information
 9 Months Ended
Sep. 30, 2025
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information Supplemental Cash Flow Information
Nine Months Ended 
September 30,
(Millions of dollars)20252024
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)$970 $959 
Net income taxes paid to (received from) taxing authorities(a)
130 613 
Non-cash investing and financing activities:
Contribution of assets(b)
115 — 
Book value of equity method investment(c)
282 — 
Contingent consideration(d)
234 — 
(a)    Includes $111 million and $439 million in the nine months ended September 30, 2025 and September 30, 2024, respectively, paid to third parties for transferable tax credits.
(b)    Represents the book value of assets contributed by MPLX to a joint venture.
(c)    Represents the book value of MPLX’s equity method investment in BANGL, prior to MPLX buying out the remaining interest in this entity as part of the BANGL Acquisition. See Note 4 - BANGL, LLC Acquisitions.
(d)    See Note 4 - BANGL, LLC Acquisitions.

The consolidated statements of cash flows exclude changes to the consolidated balance sheets that did not affect cash. The following is a reconciliation of additions to property, plant and equipment to total capital expenditures:
Nine Months Ended 
September 30,
(Millions of dollars)20252024
Additions to property, plant and equipment per the consolidated statements of cash flows$2,305 $1,723 
Increase (decrease) in capital accruals105 (18)
Total capital expenditures$2,410 $1,705 
v3.25.3
Other Current Liabilities
 9 Months Ended
Sep. 30, 2025
Other Liabilities Disclosure [Abstract]  
Other Liabilities Disclosure Other Current Liabilities
The following summarizes the components of other current liabilities:
(Millions of dollars)September 30,
2025		December 31,
2024
Environmental credits liability$768 $422 
Accrued interest payable329 314 
Other current liabilities513 419 
Total other current liabilities$1,610 $1,155 
v3.25.3
Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2025
Equity [Abstract]  
Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss)
The following table shows the changes in accumulated other comprehensive income (loss) by component. Amounts in parentheses indicate debits.
(Millions of dollars)Pension BenefitsOther BenefitsOtherTotal
Balance as of December 31, 2023$(261)$129 $1 $(131)
Other comprehensive income (loss) before reclassifications, net of tax of $1
2 (1)(1)— 
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service credit(a)
(25)(16)— (41)
 Amortization of actuarial loss(a)
5 — — 5 
Tax effect5 4 — 9 
Other comprehensive loss(13)(13)(1)(27)
Balance as of September 30, 2024$(274)$116 $— $(158)

(Millions of dollars)Pension BenefitsOther BenefitsOtherTotal
Balance as of December 31, 2024$(235)$122 $(1)$(114)
Other comprehensive income before reclassifications, net of tax of $4
9 2 — 11 
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service credit(a)
(6)(16)— (22)
 Amortization of actuarial loss(a)
12 — — 12 
 Settlement loss(a)
1 — — 1 
Other— — 1 1 
Tax effect(2)4 — 2 
Other comprehensive income (loss)14 (10)1 5 
Balance as of September 30, 2025$(221)$112 $— $(109)
(a)These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 21.
v3.25.3
Pension and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Pension and Other Postretirement Plans Pension and Other Postretirement Benefits
The following summarizes the components of net periodic benefit costs:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Pension Benefits
Service cost$56 $63 $168 $170 
Interest cost36 31 108 92 
Expected return on plan assets(36)(36)(108)(110)
Amortization of prior service credit(2)(9)(6)(25)
Amortization of actuarial loss4 3 12 5 
Settlement loss— — 1 — 
Net periodic pension benefit cost$58 $52 $175 $132 
Other Benefits
Service cost$5 $5 $15 $15 
Interest cost9 8 26 24 
Amortization of prior service credit(5)(5)(16)(16)
Net periodic other benefit cost$9 $8 $25 $23 
The components of net periodic benefit cost, other than the service cost component, are included in net interest and other financial costs on the consolidated statements of income.
During the nine months ended September 30, 2025, we made contributions of $191 million to our funded pension plans. Benefit payments related to unfunded pension and other postretirement benefit plans were $7 million and $39 million, respectively, during the nine months ended September 30, 2025.
v3.25.3
Commitments and Contingencies
 9 Months Ended
Sep. 30, 2025
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingencies Commitments and Contingencies
We are the subject of, or a party to, a number of pending or threatened legal actions, contingencies and commitments involving a variety of matters, including laws and regulations relating to the environment. Some of these matters are discussed below. For matters for which we have not recorded a liability, we are unable to estimate a range of possible loss because the issues involved have not been fully developed through pleadings, discovery or court proceedings. However, the ultimate resolution of some of these contingencies could, individually or in the aggregate, be material.
Environmental Matters
We are subject to federal, state, local and foreign laws and regulations relating to the environment. These laws generally provide for control of pollutants released into the environment and require responsible parties to undertake remediation of hazardous waste disposal sites and certain other locations including presently or formerly owned or operated retail marketing sites. Penalties may be imposed for noncompliance.
At September 30, 2025 and December 31, 2024, accrued liabilities for remediation totaled $339 million and $364 million, respectively. It is not presently possible to estimate the ultimate amount of all remediation costs that might be incurred or the penalties, if any, that may be imposed. Receivables for recoverable costs from certain states, under programs to assist companies in clean-up efforts related to underground storage tanks at presently or formerly owned or operated retail marketing sites, were $3 million and $6 million at September 30, 2025 and December 31, 2024, respectively.
Governmental and other entities in various states have filed climate-related lawsuits against a number of energy companies, including MPC. Although each suit is separate and unique, the lawsuits generally allege defendants made knowing misrepresentations about knowingly concealing, or failing to warn of the impacts of their petroleum products which led to increased demand and worsened climate change. Plaintiffs are seeking unspecified damages and abatement under various tort theories, as well as breaches of consumer protection and unfair trade statutes. We are currently subject to such proceedings in federal or state courts in Delaware, Maryland, Hawaii and Oregon. Similar lawsuits may be filed in other jurisdictions. At this early stage, the ultimate outcome of these matters remains uncertain, and neither the likelihood of an unfavorable outcome nor the ultimate liability, if any, can be determined.
We are involved in a number of environmental enforcement matters arising in the ordinary course of business. While the outcome and impact on us cannot be predicted with certainty, management believes the resolution of these environmental matters will not, individually or collectively, have a material adverse effect on our consolidated results of operations, financial position or cash flows.
Other Legal Proceedings
In July 2020, Tesoro High Plains Pipeline Company, LLC (“THPP”), a subsidiary of MPLX, received a Notification of Trespass Determination from the Bureau of Indian Affairs (“BIA”) relating to a portion of the Tesoro High Plains Pipeline that crosses the Fort Berthold Reservation in North Dakota. The notification demanded the immediate cessation of pipeline operations and assessed trespass damages of approximately $187 million. After subsequent appeal proceedings and in compliance with a new order issued by the BIA, in December 2020, THPP paid approximately $4 million in assessed trespass damages and ceased use of the portion of the pipeline that crosses the property at issue. In March 2021, the BIA issued an order purporting to vacate the BIA’s prior orders related to THPP’s alleged trespass and direct the Regional Director of the BIA to reconsider the issue of THPP’s alleged trespass and issue a new order. In April 2021, THPP filed a lawsuit in the District of North Dakota against the United States of America, the U.S. Department of the Interior and the BIA (collectively, the “U.S. Government Parties”) challenging the March 2021 order purporting to vacate all previous orders related to THPP’s alleged trespass. On February 8, 2022, the U.S. Government Parties filed their answer and counterclaims to THPP’s suit claiming THPP is in continued trespass with respect to the pipeline and seek disgorgement of pipeline profits from June 1, 2013 to present, removal of the pipeline and remediation. On November 8, 2023, the District Court of North Dakota granted THPP’s motion to sever and stay the U.S. Government Parties’ counterclaims. The case will proceed on the merits of THPP’s challenge to the March 2021 order purporting to vacate all previous orders related to THPP’s alleged trespass. THPP continues not to operate that portion of the pipeline that crosses the property at issue.
We are also a party to a number of other lawsuits and other proceedings arising in the ordinary course of business. While the ultimate outcome and impact to us cannot be predicted with certainty, we believe that the resolution of these other lawsuits and proceedings will not, individually or collectively, have a material adverse effect on our consolidated financial position, results of operations or cash flows.
Guarantees
We have provided certain guarantees, direct and indirect, of the indebtedness of other companies. Under the terms of most of these guarantee arrangements, we would be required to perform should the guaranteed party fail to fulfill its obligations under the specified arrangements. In addition to these financial guarantees, we also have various performance guarantees related to specific agreements.
Guarantees related to indebtedness of equity method investees
LOOP and LOCAP
MPC and MPLX hold interests in an offshore oil port, LOOP, and MPLX holds an interest in a crude oil pipeline system, LOCAP. Both LOOP and LOCAP have secured various project financings with throughput and deficiency agreements. Under the agreements, MPC, as a shipper, is required to advance funds if the investees are unable to service their debt. Any such advances are considered prepayments of future transportation charges. The duration of the agreements varies but tends to follow the terms of the underlying debt, which extend through 2040. Our maximum potential undiscounted payments under these agreements for the debt principal totaled $212 million as of September 30, 2025.
Dakota Access Pipeline
MPLX holds a 9.19 percent indirect interest in a joint venture (“Dakota Access”), which owns and operates the Dakota Access Pipeline and Energy Transfer Crude Oil Pipeline projects (collectively, the “Bakken Pipeline system”). In 2020, the U.S. District Court for the District of Columbia (the “D.D.C.”) ordered the U.S. Army Corps of Engineers (“Army Corps”), which granted permits and an easement for the Bakken Pipeline system, to prepare an environmental impact statement (“EIS”) relating to an easement under Lake Oahe in North Dakota. The D.D.C. later vacated the easement. The Army Corps issued a draft EIS in September 2023 detailing various options for the easement going forward, including denying the easement, approving the easement with additional measures, rerouting the easement, or approving the easement with no changes. The Army Corps has not selected a preferred alternative, but will make a decision in its final review, after considering input from the public and other agencies. The pipeline remains operational while the Army Corps finalizes its decision which will follow the issuance of the final EIS. According to public statements from Army Corps officials, the EIS is expected to be issued in 2025.
MPLX has entered into a Contingent Equity Contribution Agreement whereby it, along with the other joint venture owners in the Bakken Pipeline system, has agreed to make equity contributions to the joint venture upon certain events occurring to allow the entities that own and operate the Bakken Pipeline system to satisfy their senior note payment obligations. The senior notes were issued to repay amounts owed by the pipeline companies to fund the cost of construction of the Bakken Pipeline system. If the vacatur of the easement results in a temporary shutdown of the pipeline, MPLX would have to contribute its 9.19 percent pro rata share of funds required to pay interest accruing on the notes and any portion of the principal that matures while the pipeline is shut down. MPLX also expects to contribute its 9.19 percent pro rata share of any costs to remediate any deficiencies to reinstate the easement and/or return the pipeline into operation. If the vacatur of the easement results in a permanent shutdown of the pipeline, MPLX would have to contribute its 9.19 percent pro rata share of the cost to redeem the bonds (including the 1 percent redemption premium required pursuant to the indenture governing the notes) and any accrued and unpaid interest. As of September 30, 2025, our maximum potential undiscounted payments under the Contingent Equity Contribution Agreement were approximately $78 million.
Other guarantees
We have entered into other guarantees with maximum potential undiscounted payments totaling $185 million as of September 30, 2025, which primarily consist of a commitment to indemnify a joint venture member for our pro rata share of any payments made under a performance guarantee for construction of a pipeline by an equity method investee, a commitment to contribute cash to an equity method investee for certain catastrophic events in lieu of procuring insurance coverage, a commitment to pay a termination fee on a supply agreement if terminated during the initial term, a commitment to fund a share of the bonds issued by a government entity for construction of public utilities in the event that other industrial users of the facility default on their utility payments and leases of assets containing general lease indemnities and guaranteed residual values.
Contractual Commitments and Contingencies
Certain natural gas processing and gathering arrangements require us to construct natural gas processing plants, natural gas gathering pipelines and NGL pipelines and contain certain fees and charges if specified construction milestones are not achieved for reasons other than force majeure. In certain cases, certain producer customers may have the right to cancel the processing arrangements if there are significant delays that are not due to force majeure.
v3.25.3
Insider Trading Arrangements
 3 Months Ended
Sep. 30, 2025
Trading Arrangements, by Individual  
Rule 10b5-1 Arrangement Adopted false
Non-Rule 10b5-1 Arrangement Adopted false
Rule 10b5-1 Arrangement Terminated false
Non-Rule 10b5-1 Arrangement Terminated false
v3.25.3
Description of the Business and Basis of Presentation (Policies)
 9 Months Ended
Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Consolidation
These consolidated financial statements include the accounts of our majority-owned, controlled subsidiaries, including MPLX. All significant intercompany transactions and accounts have been eliminated. Due to our ownership of the general partner interest of MPLX, we have determined that we control MPLX and therefore we consolidate MPLX and record a noncontrolling interest for the interest owned by the public. Changes in ownership interest in consolidated subsidiaries that do not result in a change in control are recorded as equity transactions. Investments in entities over which we have significant influence, but not control, are accounted for using the equity method of accounting. This includes entities in which we hold majority ownership but the minority shareholders have substantive participating rights.
Inventories Inventories are carried at the lower of cost or market value. Costs of crude oil and other feedstocks and refined products are aggregated on a consolidated basis for purposes of assessing whether the LIFO cost basis of these inventories may have to be written down to market values.
Derivative instruments
Derivatives that are not designated as accounting hedges may include commodity derivatives used to hedge price risk on (1) inventories, (2) fixed price sales of refined products, (3) the acquisition of foreign-sourced crude oil, (4) the acquisition of ethanol for blending with refined products, (5) the sale of NGLs, (6) the purchase of natural gas and (7) the purchase of soybean oil.
v3.25.3
Master Limited Partnership (Tables)
 9 Months Ended
Sep. 30, 2025
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total share repurchases were as follows for the respective periods:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(In millions, except per share data)2025202420252024
Number of shares repurchased3 16 15 44 
Cash paid for shares repurchased(a)
$650 $2,701 $2,399 $7,815 
Average cost per share(b)
$174.32 $170.99 $153.83 $175.20 
(a)    The nine months ended September 30, 2025 excludes $88 million paid in 2025 for excise tax on 2024 share repurchases.
(b)    The average cost per share includes excise tax on share repurchases resulting from the Inflation Reduction Act of 2022, but the excise tax does not reduce the remaining share repurchase authorization.
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net
As a result of equity transactions of MPLX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interests in MPLX were as follows:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Increase (decrease) due to change in ownership$(42)$(29)$(45)$198 
Tax impact62 9 61 (67)
Increase (decrease) in MPC's additional paid-in capital, net of tax$20 $(20)$16 $131 
MPLX LP  
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total unit repurchases were as follows for the respective periods:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(In millions, except per unit data)2025202420252024
Number of common units repurchased2 2 6 6 
Cash paid for common units repurchased$100 $76 $300 $226 
Average cost per unit$50.86 $42.89 $51.20 $41.32 
v3.25.3
Acquisitions and Other Transactions (Tables)
 9 Months Ended
Sep. 30, 2025
Business Combination [Line Items]  
Disposal Groups, Including Discontinued Operations
The following table presents the carrying value of assets and liabilities as presented within assets and liabilities held for sale on our consolidated balance sheets as of September 30, 2025:
(In millions)September 30,
2025
Assets
Receivables, less allowance for expected credit loss$28 
Inventories25 
Equity method investments123 
Property, plant and equipment, net of accumulated depreciation of $340
788 
Intangibles, net of accumulated amortization of $178
68 
Right of use assets, net2 
Total assets classified as held for sale$1,034 
Liabilities
Accounts payable$27 
Accrued taxes3 
Operating lease liabilities1 
Other current liabilities16 
Long-term operating lease liabilities1 
Deferred credits and other liabilities182 
Total liabilities classified as held for sale$230 
Northwind Midstream Acquisition  
Business Combination [Line Items]  
Business Combination, Recognized Asset Acquired and Liability Assumed The following table reflects our preliminary allocation of the $2.4 billion purchase price to the Northwind Midstream assets and liabilities:
(In millions)August 29,
2025
Assets acquired:
Cash and cash equivalents$17 
Receivables11 
Other current assets1 
Property, plant and equipment1,182 
Intangibles951 
Other noncurrent assets2 
Total assets acquired2,164 
Liabilities assumed:
Accounts payable105 
Other current liabilities1 
Long-term operating lease liabilities1 
Total liabilities assumed107 
Total identifiable net assets2,057 
Goodwill356 
Fair value of net assets acquired$2,413 
BANGL, LLC Acquisition  
Business Combination [Line Items]  
Business Combination, Recognized Asset Acquired and Liability Assumed The following table reflects our preliminary determination of the fair value of the BANGL assets and liabilities:
(In millions)July 1,
2025
Assets acquired:
Cash and cash equivalents$18 
Other current assets4 
Property, plant and equipment1,550 
Intangibles77 
Other noncurrent assets22 
Total assets acquired1,671 
Liabilities assumed:
Long-term debt due within one year46 
Other current liabilities42 
Long-term debt610 
Other long-term liabilities1 
Total liabilities assumed699 
Total identifiable net assets972 
Goodwill731 
Fair value of net assets acquired$1,703 
Schedule of Business Combination, Consideration
The following table summarizes the purchase price consideration in connection with the BANGL Acquisition:
(In millions)
Total cash paid$703 
Fair value of contingent consideration as of acquisition date234 
Total consideration937 
Fair value of previously held equity interest766 
Fair value of net assets acquired$1,703 
v3.25.3
Variable Interest Entities (Tables)
 9 Months Ended
Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Variable Interest Entities
The following table presents balance sheet information for the assets and liabilities of MPLX, which are included in our consolidated balance sheets.
(Millions of dollars)September 30,
2025		December 31,
2024
Assets
Cash and cash equivalents$1,765 $1,519 
Receivables, less allowance for expected credit loss741 731 
Inventories175 180 
Other current assets38 29 
Assets held for sale1,034 — 
Equity method investments4,792 4,531 
Property, plant and equipment, net21,348 19,154 
Goodwill8,732 7,645 
Intangibles, net1,443 518 
Right of use assets, net276 273 
Other noncurrent assets1,060 995 
Liabilities
Accounts payable$859 $719 
Accrued taxes112 82 
Debt due within one year1,501 1,693 
Operating lease liabilities49 45 
Other current liabilities426 370 
Liabilities held for sale230 — 
Long-term debt24,145 19,255 
Deferred income taxes20 18 
Long-term operating lease liabilities220 217 
Deferred credits and other liabilities479 445 
v3.25.3
Related Party Transactions (Tables)
 9 Months Ended
Sep. 30, 2025
Related Party Transactions [Abstract]  
Related Party Transactions
Transactions with related parties were as follows:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Sales to related parties$390 $213 $1,036 $711 
Purchases from related parties751 624 2,163 1,778 
Sales to related parties, which are included in sales and other operating revenues, consist primarily of refined product sales and renewable feedstock sales to certain of our equity affiliates.
Purchases from related parties are included in cost of revenues. We obtain utilities, transportation services and purchase renewable diesel from certain of our equity affiliates.
We also purchased ethanol from TAMH, an equity affiliate. On July 31, 2025, MPC sold its interest in TAMH. TAMH ceased to be a related party after the sale. See Note 4.
v3.25.3
Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Summary of Earnings (Loss) Per Common Share
We compute basic earnings per share by dividing net income attributable to MPC less income allocated to participating securities by the weighted average number of shares of common stock outstanding. Since MPC grants certain incentive compensation awards to employees and non-employee directors that are considered to be participating securities, we have calculated our earnings per share using the two-class method. Diluted income per share assumes exercise of certain share-based compensation awards, provided the effect is not anti-dilutive.
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(In millions, except per share data)2025202420252024
Basic earnings per share:
Allocation of earnings
Net income attributable to MPC$1,370 $622 $2,512 $3,074 
Income allocated to participating securities(2)— (3)(2)
Income available to common stockholders - basic$1,368 $622 $2,509 $3,072 
Weighted average common shares outstanding303 331 307 347 
Basic earnings per share$4.51 $1.88 $8.16 $8.85 
Diluted earnings per share:
Allocation of earnings
Net income attributable to MPC$1,370 $622 $2,512 $3,074 
Income allocated to participating securities(2)— (3)(2)
Income available to common stockholders - diluted$1,368 $622 $2,509 $3,072 
Weighted average common shares outstanding303 331 307 347 
Effect of dilutive securities1 1 1 1 
Weighted average common shares, including dilutive effect304 332 308 348 
Diluted earnings per share$4.51 $1.87 $8.15 $8.83 
Potential common shares that were anti-dilutive and, therefore, omitted from the diluted share calculation, were immaterial for all periods.
v3.25.3
Equity (Tables)
 9 Months Ended
Sep. 30, 2025
Equity [Abstract]  
Share Repurchases
Total share repurchases were as follows for the respective periods:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(In millions, except per share data)2025202420252024
Number of shares repurchased3 16 15 44 
Cash paid for shares repurchased(a)
$650 $2,701 $2,399 $7,815 
Average cost per share(b)
$174.32 $170.99 $153.83 $175.20 
(a)    The nine months ended September 30, 2025 excludes $88 million paid in 2025 for excise tax on 2024 share repurchases.
(b)    The average cost per share includes excise tax on share repurchases resulting from the Inflation Reduction Act of 2022, but the excise tax does not reduce the remaining share repurchase authorization.
v3.25.3
Segment Information (Tables)
 9 Months Ended
Sep. 30, 2025
Segment Reporting [Abstract]  
Adjusted EBITDA
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Segment adjusted EBITDA for reportable segments
Refining & Marketing$1,762 $1,136 $4,141 $5,144 
Midstream1,709 1,628 5,070 4,837 
Renewable Diesel(56)(61)(117)(178)
Total reportable segments$3,415 $2,703 $9,094 $9,803 
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Reconciliation of segment adjusted EBITDA for reportable segments to income before income taxes
Total reportable segments$3,415 $2,703 $9,094 $9,803 
Corporate(209)(196)(627)(600)
Refining & Renewable Diesel planned turnaround costs(401)(290)(1,141)(1,121)
Renewable Diesel JV planned turnaround costs(a)
(3)— (13)— 
Gain on sale of assets(b)
738 — 738 151 
SRE57 — 57 — 
Transaction-related costs(c)
(21)— (21)— 
Depreciation and amortization(841)(846)(2,423)(2,511)
Renewable Diesel JV depreciation and amortization(a)
(22)(22)(67)(67)
Net interest and other financial costs(310)(221)(933)(594)
Income before income taxes$2,403 $1,128 $4,664 $5,061 
(a)    Represents MPC’s pro-rata share of expenses from joint ventures included in the Renewable Diesel segment.
(b)    The three and nine months ended September 30, 2025 includes gains from the BANGL Acquisition and the sale of MPC’s interest in TAMH. The nine months ended September 30, 2024 includes the gain from the Whistler Joint Venture Transaction (as defined in Note 4). See Note 4 for additional information.
(c)    Transaction-related costs include costs associated with significant transactions discussed in Note 4.
Reconciliation of Revenue from Segments to Consolidated
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Sales and other operating revenues
Refining & Marketing
Revenues from external customers(a)
$32,647 $33,298 $93,932 $100,435 
Intersegment revenues7 43 53 128 
Refining & Marketing segment revenues32,654 33,341 93,985 100,563 
Midstream
Revenues from external customers(a)
1,449 1,332 4,230 3,813 
Intersegment revenues1,481 1,468 4,421 4,319 
Midstream segment revenues2,930 2,800 8,651 8,132 
Renewable Diesel
Revenues from external customers(a)
713 477 1,963 1,479 
Intersegment revenues3 4 12 18 
Renewable Diesel segment revenues716 481 1,975 1,497 
Total segment revenues36,300 36,622 104,611 110,192 
Less: intersegment revenues1,491 1,515 4,486 4,465 
Consolidated sales and other operating revenues(a)
$34,809 $35,107 $100,125 $105,727 
(a)    Includes sales to related parties. See Note 6 for additional information. See Note 17 for the disaggregation of our revenue from external customers by segment and product line.
Other Significant Reconciling Items from Segments to Consolidated
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Income from equity method investments
Refining & Marketing$3 $29 $11 $46 
Midstream213 176 613 560 
Renewable Diesel22 14 56 39 
Total segment income from equity method investments238 219 680 645 
Corporate(a)
738 — 738 151 
Consolidated income from equity method investments$976 $219 $1,418 $796 
(a)    The three and nine months ended September 30, 2025 includes gains from the BANGL Acquisition and the sale of MPC’s interest in TAMH. The nine months ended September 30, 2024 represents the gain from the Whistler Joint Venture Transaction. See Note 4 for additional information.
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Segment expenses
Refining & Marketing
Cost of purchases$27,353 $28,883 $79,569 $85,722 
Refining operating costs1,546 1,435 4,504 4,263 
Distribution costs1,574 1,475 4,589 4,384 
Other segment items(a)
422 441 1,193 1,096 
Refining & Marketing segment expenses$30,895 $32,234 $89,855 $95,465 
Midstream
Other segment items(b)
1,434 1,348 4,194 3,855 
Midstream segment expenses$1,434 $1,348 $4,194 $3,855 
Renewable Diesel
Operating costs67 75 203 201 
Distribution costs22 16 69 67 
Other segment items(c)
705 465 1,876 1,446 
Renewable Diesel segment expenses$794 $556 $2,148 $1,714 
(a)    Other segment items for the Refining & Marketing segment include costs that are reimbursed by customers through commercial arrangements, as well as LIFO inventory adjustments.
(b)    Other segment items for the Midstream segment include operating expenses and purchased product costs. For purposes of managing the Midstream segment, the CODM is only provided consolidated Midstream expense information.
(c)    Other segment items for the Renewable Diesel segment include purchased product costs.
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Depreciation and amortization
Refining & Marketing$426 $448 $1,237 $1,345 
Midstream369 353 1,069 1,041 
Renewable Diesel(a)
17 17 53 50 
Total segment depreciation and amortization812 818 2,359 2,436 
Corporate29 28 64 75 
Consolidated depreciation and amortization$841 $846 $2,423 $2,511 
(a)    Excludes our pro-rata share of Renewable Diesel JV depreciation and amortization of $22 million, $22 million, $67 million and $67 million in the three months ended September 30, 2025 and 2024 and nine months ended September 30, 2025 and 2024, respectively, which was adjusted for purposes of arriving at Renewable Diesel segment adjusted EBITDA.
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Capital expenditures
Refining & Marketing$423 $369 $1,132 $961 
Midstream919 557 1,996 1,125 
Renewable Diesel16 3 18 6 
Total segment capital expenditures and investments1,358 929 3,146 2,092 
Less investments in equity method investees333 271 821 450 
Plus:
Corporate6 7 21 25 
Capitalized interest26 14 64 38 
Consolidated capital expenditures(a)
$1,057 $679 $2,410 $1,705 
(a)Includes changes in capital expenditure accruals. See Note 18 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the nine months ended September 30, 2025 and 2024 as reported in the consolidated statements of cash flows.
v3.25.3
Net Interest and Other Financial Costs (Tables)
 9 Months Ended
Sep. 30, 2025
Other Income and Expenses [Abstract]  
Net Interest And Other Financial Income (Costs)
Net interest and other financial costs were as follows:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Interest income$(41)$(102)$(118)$(308)
Interest expense368 352 1,079 1,034 
Interest capitalized(27)(15)(67)(40)
Pension and other postretirement non-service costs(a)
6 (8)17 (30)
Investments - net premium (discount) amortization— (20)— (90)
Other financial costs4 14 22 28 
Net interest and other financial costs$310 $221 $933 $594 
(a)See Note 21.
v3.25.3
Inventories (Tables)
 9 Months Ended
Sep. 30, 2025
Inventory Disclosure [Abstract]  
Summary Of Inventories
(Millions of dollars)September 30,
2025		December 31,
2024
Crude oil and other feedstocks$3,049 $3,185 
Refined products5,435 5,137 
Materials and supplies1,345 1,246 
Total$9,829 $9,568 
v3.25.3
Property, Plant and Equipment (PP&E) (Tables)
 9 Months Ended
Sep. 30, 2025
Property, Plant and Equipment [Abstract]  
Summary Of Property, Plant And Equipment
September 30, 2025December 31, 2024
(Millions of dollars)Gross
PP&E		Accumulated DepreciationNet
PP&E		Gross
PP&E		Accumulated DepreciationNet
PP&E
Refining & Marketing$33,973 $20,129 $13,844 $32,965 $19,015 $13,950 
Midstream33,399 11,381 22,018 30,697 10,798 19,899 
Renewable Diesel969 380 589 976 338 638 
Corporate1,726 1,193 533 1,679 1,138 541 
Total$70,067 $33,083 $36,984 $66,317 $31,289 $35,028 
v3.25.3
Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Assets and Liabilities Accounted for at Fair Value on Recurring Basis
The following tables present assets and liabilities accounted for at fair value on a recurring basis as of September 30, 2025 and December 31, 2024 by fair value hierarchy level. We have elected to offset the fair value amounts recognized for multiple derivative contracts executed with the same counterparty, including any related cash collateral as shown below; however, fair value amounts by hierarchy level are presented on a gross basis in the following tables.
September 30, 2025
Fair Value Hierarchy
(Millions of dollars)Level 1Level 2Level 3
Netting and Collateral(a)
Net Carrying Value on Balance Sheet(b)
Collateral Pledged Not Offset
Assets:
Commodity contracts$227 $— $— $(205)$22 $42 
Liabilities:
Commodity contracts$217 $— $— $(217)$— $— 
Embedded derivatives in commodity contracts— — 51 — 51 — 
Contingent consideration, liability— — 234 — 234 — 
December 31, 2024
Fair Value Hierarchy
(Millions of dollars)Level 1Level 2Level 3
Netting and Collateral(a)
Net Carrying Value on Balance Sheet(b)
Collateral Pledged Not Offset
Assets:
Commodity contracts$139 $— $— $(132)$7 $16 
Liabilities:
Commodity contracts$144 $— $— $(144)$— $— 
Embedded derivatives in commodity contracts— — 58 — 58 — 
(a)Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of September 30, 2025, cash collateral of $12 million was netted with mark-to-market derivative liabilities. As of December 31, 2024, cash collateral of $12 million was netted with mark-to-market derivative liabilities.
(b)We have no derivative contracts which are subject to master netting arrangements reflected gross on the balance sheet.
Reconciliation of Net Beginning and Ending Balances Recorded for Net Assets and Liabilities Classified as Level 3
The following is a reconciliation of the beginning and ending balances recorded for net liabilities classified as Level 3 in the fair value hierarchy.
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Beginning balance$55 $69 $58 $61 
Contingent consideration(a)
234 — 234 — 
Unrealized and realized (gain) loss included in net income(b)
(2)3 1 18 
Settlements of derivative instruments(2)(3)(8)(10)
Ending balance$285 $69 $285 $69 
The amount of total (gain) loss for the period included in earnings attributable to the change in unrealized (gain) loss relating to liabilities still held at the end of period(b):
$(2)$3 $1 $15 
(a)    Liability recorded in the third quarter of 2025 related to the BANGL Acquisition earnout provision.
(b)    The (gain) loss is included in cost of revenues on the consolidated statements of income.
v3.25.3
Derivatives (Tables)
 9 Months Ended
Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Classification of Fair Values of Derivative Instruments, Excluding Cash Collateral
The following table presents the fair value of derivative instruments as of September 30, 2025 and December 31, 2024 and the line items in the consolidated balance sheets in which the fair values are reflected. The fair value amounts below are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under the terms of our master netting arrangements including cash collateral on deposit with, or received from, brokers. We offset the recognized fair value amounts for multiple derivative instruments executed with the same counterparty in our financial statements when a legal right of offset exists. As a result, the asset and liability amounts below will not agree with the amounts presented in our consolidated balance sheets.

(Millions of dollars)September 30, 2025December 31, 2024
Balance Sheet LocationAssetLiabilityAssetLiability
Commodity derivatives
Other current assets$227 $217 $139 $144 
Other current liabilities(a)
— 8 — 10 
Deferred credits and other liabilities(a)
— 43 — 48 
(a)     Includes embedded derivatives.
Open Commodity Derivative Contracts
The table below summarizes open commodity derivative contracts for crude oil, refined products, blending products and soybean oil as of September 30, 2025.
Percentage of contracts
that expire next quarter		Position
(Units in thousands of barrels)LongShort
Exchange-traded(a)
Crude oil86.4%55,815 55,891 
Refined products91.7%35,257 41,523 
Blending products79.2%9,697 12,003 
Soybean oil98.5%2,197 2,981 
(a)    Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 6,910 long and 6,976 short and Refined products - 2,283 long and 2,661 short. There are no spread contracts for Blending products or Soybean oil.
Effect of Commodity Derivative Instruments in Statements of Income
The following table summarizes the effect of all commodity derivative instruments in our consolidated statements of income: 
Gain (Loss)
(Millions of dollars)Three Months Ended 
September 30,		Nine Months Ended 
September 30,
Income Statement Location2025202420252024
Sales and other operating revenues$— $4 $— $2 
Cost of revenues(6)38 (42)(82)
Other income2 (1)5 (2)
Total$(4)$41 $(37)$(82)
v3.25.3
Debt (Tables)
 9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Outstanding Borrowings
Our outstanding borrowings at September 30, 2025 and December 31, 2024 consisted of the following:
(Millions of dollars)September 30,
2025		December 31,
2024
MPC:
Senior notes$6,449 $5,699 
MARAD debt161 174 
Finance lease obligations665 718 
Total7,275 6,591 
MPLX:
Senior notes26,000 21,200 
Finance lease obligations7 6 
Total26,007 21,206 
Total debt33,282 27,797 
Unamortized debt issuance costs(210)(142)
Unamortized discount, net of unamortized premium(228)(174)
Amounts due within one year(1,612)(3,049)
Total long-term debt due after one year$31,232 $24,432 
Schedule of Line of Credit Facilities Capacity under our Credit Facilities as of September 30, 2025
(Millions of dollars)Total
Capacity		Outstanding
Borrowings		Outstanding
Letters
of Credit		Available
Capacity		Weighted
Average
Interest
Rate		Expiration
MPC, excluding MPLX
MPC bank revolving credit facility$5,000 $— $1 $4,999 — %July 2027
MPC trade receivables securitization facility(a)
100 — — 100 — %September 2027
MPLX
MPLX bank revolving credit facility2,000 — — 2,000 — %July 2027
(a)    The committed borrowing and letter of credit issuance capacity under the trade receivables securitization facility is $100 million. In addition, the facility allows for the issuance of letters of credit in excess of the committed capacity at the discretion of the issuing banks.
v3.25.3
Revenue (Tables)
 9 Months Ended
Sep. 30, 2025
Revenue from Contract with Customer [Abstract]  
Revenue from External Customers by Products and Services
The following table presents our revenues from external customers disaggregated by segment and product line:

Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Refining & Marketing
Refined products$30,525 $30,987 $87,897 $93,329 
Crude oil1,586 1,826 4,570 5,713 
Services and other536 485 1,465 1,393 
Total revenues from external customers32,647 33,298 93,932 100,435 
Midstream
Refined products527 431 1,529 1,197 
Services and other922 901 2,701 2,616 
Total revenues from external customers1,449 1,332 4,230 3,813 
Renewable Diesel
Refined products709 475 1,953 1,474 
Services and other4 2 10 5 
Total revenues from external customers713 477 1,963 1,479 
Sales and other operating revenues$34,809 $35,107 $100,125 $105,727 
v3.25.3
Supplemental Cash Flow Information (Tables)
 9 Months Ended
Sep. 30, 2025
Supplemental Cash Flow Elements [Abstract]  
Summary of Supplemental Cash Flow Information
Nine Months Ended 
September 30,
(Millions of dollars)20252024
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)$970 $959 
Net income taxes paid to (received from) taxing authorities(a)
130 613 
Non-cash investing and financing activities:
Contribution of assets(b)
115 — 
Book value of equity method investment(c)
282 — 
Contingent consideration(d)
234 — 
(a)    Includes $111 million and $439 million in the nine months ended September 30, 2025 and September 30, 2024, respectively, paid to third parties for transferable tax credits.
(b)    Represents the book value of assets contributed by MPLX to a joint venture.
(c)    Represents the book value of MPLX’s equity method investment in BANGL, prior to MPLX buying out the remaining interest in this entity as part of the BANGL Acquisition. See Note 4 - BANGL, LLC Acquisitions.
(d)    See Note 4 - BANGL, LLC Acquisitions.
Reconciliation of Additions to Property, Plant and Equipment to Total Capital Expenditures
The consolidated statements of cash flows exclude changes to the consolidated balance sheets that did not affect cash. The following is a reconciliation of additions to property, plant and equipment to total capital expenditures:
Nine Months Ended 
September 30,
(Millions of dollars)20252024
Additions to property, plant and equipment per the consolidated statements of cash flows$2,305 $1,723 
Increase (decrease) in capital accruals105 (18)
Total capital expenditures$2,410 $1,705 
v3.25.3
Other Current Liabilities (Tables)
 9 Months Ended
Sep. 30, 2025
Other Liabilities Disclosure [Abstract]  
Other Current Liabilities
The following summarizes the components of other current liabilities:
(Millions of dollars)September 30,
2025		December 31,
2024
Environmental credits liability$768 $422 
Accrued interest payable329 314 
Other current liabilities513 419 
Total other current liabilities$1,610 $1,155 
v3.25.3
Accumulated Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2025
Equity [Abstract]  
Changes in Accumulated Other Comprehensive Loss by Component
The following table shows the changes in accumulated other comprehensive income (loss) by component. Amounts in parentheses indicate debits.
(Millions of dollars)Pension BenefitsOther BenefitsOtherTotal
Balance as of December 31, 2023$(261)$129 $1 $(131)
Other comprehensive income (loss) before reclassifications, net of tax of $1
2 (1)(1)— 
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service credit(a)
(25)(16)— (41)
 Amortization of actuarial loss(a)
5 — — 5 
Tax effect5 4 — 9 
Other comprehensive loss(13)(13)(1)(27)
Balance as of September 30, 2024$(274)$116 $— $(158)

(Millions of dollars)Pension BenefitsOther BenefitsOtherTotal
Balance as of December 31, 2024$(235)$122 $(1)$(114)
Other comprehensive income before reclassifications, net of tax of $4
9 2 — 11 
Amounts reclassified from accumulated other comprehensive loss:
Amortization of prior service credit(a)
(6)(16)— (22)
 Amortization of actuarial loss(a)
12 — — 12 
 Settlement loss(a)
1 — — 1 
Other— — 1 1 
Tax effect(2)4 — 2 
Other comprehensive income (loss)14 (10)1 5 
Balance as of September 30, 2025$(221)$112 $— $(109)
(a)These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 21.
v3.25.3
Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Costs
The following summarizes the components of net periodic benefit costs:
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(Millions of dollars)2025202420252024
Pension Benefits
Service cost$56 $63 $168 $170 
Interest cost36 31 108 92 
Expected return on plan assets(36)(36)(108)(110)
Amortization of prior service credit(2)(9)(6)(25)
Amortization of actuarial loss4 3 12 5 
Settlement loss— — 1 — 
Net periodic pension benefit cost$58 $52 $175 $132 
Other Benefits
Service cost$5 $5 $15 $15 
Interest cost9 8 26 24 
Amortization of prior service credit(5)(5)(16)(16)
Net periodic other benefit cost$9 $8 $25 $23 
v3.25.3
Master Limited Partnership (Details)
Sep. 30, 2025
MPLX | Marathon Petroleum Corporation  
MPC's partnership interest in MLP (in percentage) 64.00%
v3.25.3
Master Limited Partnership (Unit Repurchase Program) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Aug. 05, 2025
Aug. 02, 2022
Units acquired, average cost per unit [1] $ 174.32 $ 170.99 $ 153.83 $ 175.20    
Stock repurchase program, remaining authorized repurchase amount $ 5,380   $ 5,380      
MPLX LP            
Units repurchased, units 2 2 6 6    
Units repurchased, value $ 100 $ 76 $ 300 $ 226    
Units acquired, average cost per unit $ 50.86 $ 42.89 $ 51.20 $ 41.32    
Stock repurchase program, remaining authorized repurchase amount $ 1,220   $ 1,220      
MPLX LP | Share Repurchase Authorization August 2025            
Stock repurchase program, authorized amount         $ 1,000  
MPLX LP | Share Repurchase Authorization August 2022            
Stock repurchase program, authorized amount           $ 1,000
[1] The average cost per share includes excise tax on share repurchases resulting from the Inflation Reduction Act of 2022, but the excise tax does not reduce the remaining share repurchase authorization.
v3.25.3
Master Limited Partnership (Preferred Units Outstanding) (Details)
shares in Millions
Dec. 31, 2024
shares
MPLX: | Series A Preferred Stock  
Noncontrolling Interest [Line Items]  
Temporary Equity, Shares Outstanding 6
v3.25.3
Master Limited Partnership (Noncontrolling Interest) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Equity transactions of MPLX $ (38) $ (87) $ 83 $ (68) $ 239 $ 210    
Additional Paid-in Capital                
Increase (decrease) due to change in ownership (42)     (29)     $ (45) $ 198
Tax impact 62     9     61 (67)
Equity transactions of MPLX $ 20 $ (29) $ 25 $ (20) $ 79 $ 72 $ 16 $ 131
v3.25.3
Acquisitions and Other Transactions (Northwind Midstream) (Details) - USD ($)
$ in Millions
Aug. 29, 2025
Sep. 30, 2025
Aug. 11, 2025
Mar. 10, 2025
Dec. 31, 2024
Business Combination [Line Items]          
Goodwill   $ 9,331     $ 8,244
MPLX: | Senior notes          
Business Combination [Line Items]          
Debt instrument, face amount     $ 4,500 $ 2,000  
Northwind Midstream Acquisition          
Business Combination [Line Items]          
Voting equity interest acquired, percentage 100.00%        
Total cash paid $ 2,400        
Acquired finite-lived intangible assets, weighted average useful life 15 years        
Goodwill $ 356        
Northwind Midstream Acquisition | Midstream          
Business Combination [Line Items]          
Goodwill $ 356        
v3.25.3
Acquisitions and Other Transactions (Northwind Midstream - Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Aug. 29, 2025
Dec. 31, 2024
Liabilities assumed:      
Goodwill $ 9,331   $ 8,244
Northwind Midstream Acquisition      
Assets acquired:      
Cash and cash equivalents   $ 17  
Receivables   11  
Other current assets   1  
Property, plant and equipment   1,182  
Intangibles   951  
Other noncurrent assets   2  
Total assets acquired   2,164  
Liabilities assumed:      
Accounts payable   105  
Other current liabilities   1  
Long-term operating lease liabilities   1  
Total liabilities assumed   107  
Total identifiable net assets   2,057  
Goodwill   356  
Fair value of net assets acquired   $ 2,413  
v3.25.3
Acquisitions and Other Transactions (Announced Divestiture of Rockies Operations) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Aug. 26, 2025
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net gain (loss) on disposal of assets   $ (2) $ (2) $ 4 $ 17  
Disposal Group, Not Discontinued Operations | Rockies Business            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Consideration           $ 1,000
Disposal Group, Not Discontinued Operations | Forecast | Rockies Business            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net gain (loss) on disposal of assets $ 150          
v3.25.3
Acquisitions and Other Transactions (Announced Divestiture of Rockies Operations - Assets and Liabilities Held for Sale) (Details) - Rockies Business - Disposal Group, Not Discontinued Operations
$ in Millions
Sep. 30, 2025
USD ($)
Assets  
Receivables, less allowance for expected credit loss $ 28
Inventories 25
Equity method investments 123
Property, plant and equipment, net of accumulated depreciation of $340 788
Intangibles, net of accumulated amortization of $178 68
Right of use assets, net 2
Assets held for sale 1,034
Liabilities  
Accounts payable 27
Accrued taxes 3
Operating lease liabilities 1
Other current liabilities 16
Long-term operating lease liabilities 1
Deferred credits and other liabilities 182
Liabilities held for sale 230
Accumulated depreciation 340
Accumulated amortization $ 178
v3.25.3
Acquisitions and Other Transactions (Sale of Interest in Ethanol Joint Venture) (Details) - USD ($)
$ in Millions
Jul. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Business Combination [Line Items]      
Equity method investments   $ 6,900 $ 6,857
The Andersons Marathon Holdings LLC      
Business Combination [Line Items]      
Percentage of ownership before transaction 49.90%    
Proceeds from sale of equity method investments $ 427    
Equity method investments 173    
Gain (loss) on disposition of interest in equity method investee $ 254    
v3.25.3
Acquisitions and Other Transactions (BANGL, LLC Acquisitions) (Details) - USD ($)
$ in Millions
 9 Months Ended
Jul. 03, 2025
Jul. 01, 2025
Jul. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Business Combination [Line Items]            
Payments to acquire interest in joint venture       $ 821 $ 450  
Goodwill       $ 9,331   $ 8,244
BANGL, LLC Acquisition            
Business Combination [Line Items]            
Total cash paid   $ 703        
Contingent consideration, maximum, amount   275        
Repayments of debt $ 656          
Preacquisition equity interest in acquiree, remeasurement, gain (loss)   $ 484        
Alternative Investment, Valuation Technique [Extensible Enumeration]   Valuation Technique, Discounted Cash Flow [Member]        
Voting equity interest acquired, percentage   100.00%        
Acquired finite-lived intangible assets, weighted average useful life   11 years        
Goodwill   $ 731        
Goodwill, expected tax deductible percent   55.00%        
BANGL, LLC Acquisition | Minimum            
Business Combination [Line Items]            
Alternative Investment, Measurement Input   0.11        
BANGL, LLC Acquisition | Maximum            
Business Combination [Line Items]            
Alternative Investment, Measurement Input   0.12        
BANGL, LLC Acquisition | Midstream            
Business Combination [Line Items]            
Goodwill   $ 731        
BANGL, LLC            
Business Combination [Line Items]            
Additional ownership acquired     20.00%      
Payments to acquire interest in joint venture     $ 210      
Ownership percentage     45.00%      
Basis difference     $ 156      
BANGL, LLC | BANGL, LLC Acquisition            
Business Combination [Line Items]            
Additional ownership acquired   55.00%        
v3.25.3
Acquisitions and Other Transactions (BANGL, LLC Acquisitions - Total Consideration) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 01, 2025
Sep. 30, 2025
 [1]
Sep. 30, 2024
Sep. 30, 2025
 [1],[2]
Sep. 30, 2024
Business Combination [Line Items]          
Fair value of contingent consideration as of acquisition date   $ 234 $ 0 $ 234 $ 0
BANGL, LLC Acquisition          
Business Combination [Line Items]          
Total cash paid $ 703        
Fair value of contingent consideration as of acquisition date 234        
Total consideration 937        
Fair value of previously held equity interest 766        
Fair value of net assets acquired $ 1,703        
[1] Liability recorded in the third quarter of 2025 related to the BANGL Acquisition earnout provision.
[2] See Note 4 - BANGL, LLC Acquisitions.
v3.25.3
Acquisitions and Other Transactions (BANGL, LLC Acquisitions Assets and Liabilities Purchased) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jul. 01, 2025
Dec. 31, 2024
Liabilities assumed:      
Goodwill $ 9,331   $ 8,244
BANGL, LLC Acquisition      
Assets acquired:      
Cash and cash equivalents   $ 18  
Other current assets   4  
Property, plant and equipment   1,550  
Intangibles   77  
Other noncurrent assets   22  
Total assets acquired   1,671  
Liabilities assumed:      
Long-term debt due within one year   46  
Other current liabilities   42  
Long-term debt   610  
Other long-term liabilities   1  
Total liabilities assumed   699  
Total identifiable net assets   972  
Goodwill   731  
Fair value of net assets acquired   $ 1,703  
v3.25.3
Acquisitions and Other Transactions (Whiptail Midstream Acquisition) (Details) - USD ($)
$ in Millions
 9 Months Ended
Mar. 11, 2025
Sep. 30, 2025
Sep. 30, 2024
Business Combination [Line Items]      
Payments to acquire businesses, net of cash acquired   $ 3,316 $ 622
Whiptail Midstream Acquisition      
Business Combination [Line Items]      
Payments to acquire businesses, net of cash acquired $ 237    
Property, plant and equipment 172    
Intangibles 41    
Recognized identifiable assets acquired and liabilities assumed, net working capital $ 24    
v3.25.3
Acquisitions and Other Transactions (Whistler Joint Venture Transaction) (Details) - USD ($)
$ in Millions
 9 Months Ended
May 29, 2024
Sep. 30, 2025
Sep. 30, 2024
May 28, 2024
Business Combination [Line Items]        
Investments – redemptions, repayments, return of capital and sales proceeds   $ 571 $ 141  
WPC Parent, LLC        
Business Combination [Line Items]        
Gain (loss) on disposition of interest in equity method investee $ 151      
Investments – redemptions, repayments, return of capital and sales proceeds $ 134      
WPC Parent, LLC | Enbridge Inc.        
Business Combination [Line Items]        
Ownership percentage 19.00%      
WPC Parent, LLC | MPLX        
Business Combination [Line Items]        
Ownership percentage 30.40%      
Whistler Pipeline, LLC | MPLX        
Business Combination [Line Items]        
Ownership percentage       37.50%
v3.25.3
Acquisitions and Other Transactions - Utica Midstream Acquisition (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 22, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 21, 2024
Schedule of Equity Method Investments [Line Items]            
Net gain (loss) on disposal of assets   $ (2) $ (2) $ 4 $ 17  
Utica Midstream Acquisition            
Schedule of Equity Method Investments [Line Items]            
Total cash paid $ 625          
Total identifiable net assets 625          
Recognized identifiable assets acquired and liabilities assumed, equity method investments $ 507          
Ohio Gathering Company | Utica Midstream Acquisition            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage 73.00%          
Basis difference $ 75          
Ohio Condensate Company            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage           62.00%
Ohio Condensate Company | Utica Midstream Acquisition            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage 100.00%          
Net gain (loss) on disposal of assets $ 20          
v3.25.3
Variable Interest Entities (Consolidated VIE) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets    
Cash and cash equivalents $ 2,654 $ 3,210
Receivables, less allowance for expected credit loss 10,487 11,145
Inventories 9,829 9,568
Other current assets 626 524
Assets held for sale 1,034 0
Equity method investments 6,900 6,857
Property, plant and equipment, net 36,984 35,028
Goodwill 9,331 8,244
Intangibles, net 2,749 1,774
Right of use assets, net 1,373 1,300
Other noncurrent assets 1,273 1,208
Liabilities    
Accounts payable 12,486 13,906
Accrued taxes 1,381 1,204
Debt due within one year 1,612 3,049
Operating lease liabilities 441 417
Other current liabilities 1,610 1,155
Liabilities held for sale 230 0
Long-term debt 31,232 24,432
Deferred income taxes 5,964 5,771
Long-term operating lease liabilities 918 860
Deferred credits and other liabilities 1,377 1,305
Variable Interest Entity, Primary Beneficiary | MPLX    
Assets    
Cash and cash equivalents 1,765 1,519
Receivables, less allowance for expected credit loss 741 731
Inventories 175 180
Other current assets 38 29
Assets held for sale 1,034 0
Equity method investments 4,792 4,531
Property, plant and equipment, net 21,348 19,154
Goodwill 8,732 7,645
Intangibles, net 1,443 518
Right of use assets, net 276 273
Other noncurrent assets 1,060 995
Liabilities    
Accounts payable 859 719
Accrued taxes 112 82
Debt due within one year 1,501 1,693
Operating lease liabilities 49 45
Other current liabilities 426 370
Liabilities held for sale 230 0
Long-term debt 24,145 19,255
Deferred income taxes 20 18
Long-term operating lease liabilities 220 217
Deferred credits and other liabilities $ 479 $ 445
v3.25.3
Related Party Transactions (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Related Party Transaction [Line Items]        
Sales and other operating revenues [1] $ 34,809 $ 35,107 $ 100,125 $ 105,727
Purchases from related parties 751 624 2,163 1,778
Related Party        
Related Party Transaction [Line Items]        
Sales and other operating revenues $ 390 $ 213 $ 1,036 $ 711
[1] Includes sales to related parties. See Note 6 for additional information. See Note 17 for the disaggregation of our revenue from external customers by segment and product line.
v3.25.3
Earnings Per Share (Summary of Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Basic earnings per share:        
Net income attributable to MPC $ 1,370 $ 622 $ 2,512 $ 3,074
Income allocated to participating securities, basic (2) 0 (3) (2)
Income available to common stockholders - basic $ 1,368 $ 622 $ 2,509 $ 3,072
Weighted average common shares outstanding - basic (in shares) 303 331 307 347
Basic earnings per share $ 4.51 $ 1.88 $ 8.16 $ 8.85
Diluted earnings per share:        
Net income attributable to MPC $ 1,370 $ 622 $ 2,512 $ 3,074
Income allocated to participating securities, diluted (2) 0 (3) (2)
Income available to common stockholders - diluted $ 1,368 $ 622 $ 2,509 $ 3,072
Weighted average common shares outstanding - basic (in shares) 303 331 307 347
Effect of dilutive securities (in shares) 1 1 1 1
Weighted average shares outstanding - diluted (in shares) 304 332 308 348
Diluted earnings per share $ 4.51 $ 1.87 $ 8.15 $ 8.83
v3.25.3
Equity (Share Repurchase Authorizations) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Nov. 05, 2024
Apr. 30, 2024
Equity, Class of Treasury Stock [Line Items]      
Stock repurchase program, remaining authorized repurchase amount $ 5,380    
Share Repurchase Authorization November 2024      
Equity, Class of Treasury Stock [Line Items]      
Stock repurchase program, authorized amount   $ 5,000  
Share Repurchase Authorization April 2024      
Equity, Class of Treasury Stock [Line Items]      
Stock repurchase program, authorized amount     $ 5,000
v3.25.3
Equity (Share Repurchases) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Equity [Abstract]        
Number of shares repurchased 3 16 15 44
Payments for repurchase of common stock excluding excise taxes on share repurchases $ 650 [1] $ 2,701 $ 2,399 [1] $ 7,815
Average cost per share [2] $ 174.32 $ 170.99 $ 153.83 $ 175.20
Share repurchase program, excise tax     $ (88)  
[1] The nine months ended September 30, 2025 excludes $88 million paid in 2025 for excise tax on 2024 share repurchases.
[2] The average cost per share includes excise tax on share repurchases resulting from the Inflation Reduction Act of 2022, but the excise tax does not reduce the remaining share repurchase authorization.
v3.25.3
Segment Information (Additional Information) (Details)
 9 Months Ended
Sep. 30, 2025
Segment
Segment Reporting [Abstract]  
Number of reportable segments 3
v3.25.3
Segment Information (Segment Adjusted EBITDA to Income (Loss) from Operations before Income Taxes) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Refining & Renewable Diesel planned turnaround costs $ (401) $ (290) $ (1,141) $ (1,121)
Renewable Diesel JV planned turnaround costs [1] (3) 0 (13) 0
Gain on sale of assets 738 0 [2] 738 151 [2]
SRE 57 0 57 0
Transaction-related costs (21) [3] 0 (21) [3] 0
Depreciation and amortization (841) (846) (2,423) (2,511)
Renewable Diesel JV depreciation and amortization [1] (22) (22) (67) (67)
Net interest and other financial costs (310) (221) (933) (594)
Income before income taxes 2,403 1,128 4,664 5,061
Renewable Diesel        
Segment Reporting Information [Line Items]        
Renewable Diesel JV depreciation and amortization (22) (22) (67) (67)
Operating Segments        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 3,415 2,703 9,094 9,803
Depreciation and amortization (812) (818) (2,359) (2,436)
Operating Segments | Refining & Marketing        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 1,762 1,136 4,141 5,144
Depreciation and amortization (426) (448) (1,237) (1,345)
Operating Segments | Midstream        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 1,709 1,628 5,070 4,837
Depreciation and amortization (369) (353) (1,069) (1,041)
Operating Segments | Renewable Diesel        
Segment Reporting Information [Line Items]        
Adjusted EBITDA (56) (61) (117) (178)
Depreciation and amortization [4] (17) (17) (53) (50)
Corporate        
Segment Reporting Information [Line Items]        
Costs and expenses, excluding depreciation (209) (196) (627) (600)
Depreciation and amortization $ (29) $ (28) $ (64) $ (75)
[1] Represents MPC’s pro-rata share of expenses from joint ventures included in the Renewable Diesel segment.
[2] The three and nine months ended September 30, 2025 includes gains from the BANGL Acquisition and the sale of MPC’s interest in TAMH. The nine months ended September 30, 2024 includes the gain from the Whistler Joint Venture Transaction (as defined in Note 4). See Note 4 for additional information
[3] Transaction-related costs include costs associated with significant transactions discussed in Note 4.
[4] Excludes our pro-rata share of Renewable Diesel JV depreciation and amortization of $22 million, $22 million, $67 million and $67 million in the three months ended September 30, 2025 and 2024 and nine months ended September 30, 2025 and 2024, respectively, which was adjusted for purposes of arriving at Renewable Diesel segment adjusted EBITDA.
v3.25.3
Segment Information (Reconciliation of Segment Revenues To Sales and Other Operating Revenues) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Sales and other operating revenues [1] $ 34,809 $ 35,107 $ 100,125 $ 105,727
Refining & Marketing        
Segment Reporting Information [Line Items]        
Sales and other operating revenues [1] 32,647 33,298 93,932 100,435
Midstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues [1] 1,449 1,332 4,230 3,813
Renewable Diesel        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 713 477 1,963 1,479
Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 36,300 36,622 104,611 110,192
Operating Segments | Refining & Marketing        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 32,654 33,341 93,985 100,563
Operating Segments | Midstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 2,930 2,800 8,651 8,132
Operating Segments | Renewable Diesel        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 716 481 1,975 1,497
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 1,491 1,515 4,486 4,465
Intersegment Eliminations | Refining & Marketing        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 7 43 53 128
Intersegment Eliminations | Midstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 1,481 1,468 4,421 4,319
Intersegment Eliminations | Renewable Diesel        
Segment Reporting Information [Line Items]        
Sales and other operating revenues $ 3 $ 4 $ 12 $ 18
[1] Includes sales to related parties. See Note 6 for additional information. See Note 17 for the disaggregation of our revenue from external customers by segment and product line.
v3.25.3
Segment Information (Income from Equity Method Investments) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Income from equity method investments $ 976 $ 219 $ 1,418 $ 796
Operating Segments        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Income from equity method investments 238 219 680 645
Operating Segments | Refining & Marketing        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Income from equity method investments 3 29 11 46
Operating Segments | Midstream        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Income from equity method investments 213 176 613 560
Operating Segments | Renewable Diesel        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Income from equity method investments 22 14 56 39
Corporate        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Income from equity method investments $ 738 $ 0 [1] $ 738 $ 151 [1]
[1] The three and nine months ended September 30, 2025 includes gains from the BANGL Acquisition and the sale of MPC’s interest in TAMH. The nine months ended September 30, 2024 represents the gain from the Whistler Joint Venture Transaction. See Note 4 for additional information.
v3.25.3
Segment Information (Segment Expenses) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Costs and expenses $ 33,136 $ 34,024 $ 96,203 $ 101,291
Operating Segments | Refining & Marketing        
Segment Reporting Information [Line Items]        
Cost of purchases 27,353 28,883 79,569 85,722
Operating costs 1,546 1,435 4,504 4,263
Distribution costs 1,574 1,475 4,589 4,384
Other segment items [1] 422 441 1,193 1,096
Costs and expenses 30,895 32,234 89,855 95,465
Operating Segments | Midstream        
Segment Reporting Information [Line Items]        
Other segment items [2] 1,434 1,348 4,194 3,855
Costs and expenses 1,434 1,348 4,194 3,855
Operating Segments | Renewable Diesel        
Segment Reporting Information [Line Items]        
Operating costs 67 75 203 201
Distribution costs 22 16 69 67
Other segment items [3] 705 465 1,876 1,446
Costs and expenses $ 794 $ 556 $ 2,148 $ 1,714
[1] Other segment items for the Refining & Marketing segment include costs that are reimbursed by customers through commercial arrangements, as well as LIFO inventory adjustments.
[2] Other segment items for the Midstream segment include operating expenses and purchased product costs. For purposes of managing the Midstream segment, the CODM is only provided consolidated Midstream expense information.
[3] Other segment items for the Renewable Diesel segment include purchased product costs.
v3.25.3
Segment Information (Depreciation and Amortization) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Depreciation and amortization $ 841 $ 846 $ 2,423 $ 2,511
Renewable Diesel JV depreciation and amortization [1] 22 22 67 67
Renewable Diesel        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Renewable Diesel JV depreciation and amortization 22 22 67 67
Operating Segments        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Depreciation and amortization 812 818 2,359 2,436
Operating Segments | Refining & Marketing        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Depreciation and amortization 426 448 1,237 1,345
Operating Segments | Midstream        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Depreciation and amortization 369 353 1,069 1,041
Operating Segments | Renewable Diesel        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Depreciation and amortization [2] 17 17 53 50
Corporate        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Depreciation and amortization $ 29 $ 28 $ 64 $ 75
[1] Represents MPC’s pro-rata share of expenses from joint ventures included in the Renewable Diesel segment.
[2] Excludes our pro-rata share of Renewable Diesel JV depreciation and amortization of $22 million, $22 million, $67 million and $67 million in the three months ended September 30, 2025 and 2024 and nine months ended September 30, 2025 and 2024, respectively, which was adjusted for purposes of arriving at Renewable Diesel segment adjusted EBITDA.
v3.25.3
Segment Information (Capital Expenditures) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Plus:        
Capital expenditures [1] $ 1,057 $ 679 $ 2,410 $ 1,705
Operating Segments        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Capital expenditures and investments 1,358 929 3,146 2,092
Less investments in equity method investees 333 271 821 450
Operating Segments | Refining & Marketing        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Capital expenditures and investments 423 369 1,132 961
Operating Segments | Midstream        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Capital expenditures and investments 919 557 1,996 1,125
Operating Segments | Renewable Diesel        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Capital expenditures and investments 16 3 18 6
Corporate        
Plus:        
Corporate 6 7 21 25
Capitalized interest $ 26 $ 14 $ 64 $ 38
[1] Includes changes in capital expenditure accruals. See Note 18 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the nine months ended September 30, 2025 and 2024 as reported in the consolidated statements of cash flows.
v3.25.3
Net Interest and Other Financial Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Other Income and Expenses [Abstract]        
Interest income $ (41) $ (102) $ (118) $ (308)
Interest expense 368 352 1,079 1,034
Interest capitalized (27) (15) (67) (40)
Pension and other postretirement non-service costs [1] 6 (8) 17 (30)
Investments - net premium (discount) amortization 0 (20) 0 (90)
Other financial costs 4 14 22 28
Net interest and other financial costs $ 310 $ 221 $ 933 $ 594
[1] See Note 21.
v3.25.3
Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 460 $ 113 $ 765 $ 779
v3.25.3
Inventories (Summary of Inventories) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Inventory Disclosure [Abstract]    
Crude oil and other feedstocks $ 3,049 $ 3,185
Refined products 5,435 5,137
Materials and supplies 1,345 1,246
Total $ 9,829 $ 9,568
v3.25.3
Property, Plant and Equipment (PP&E) (Summary of Property, Plant And Equipment) (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Gross PP&E $ 70,067 $ 66,317
Accumulated Depreciation 33,083 31,289
Net PP&E 36,984 35,028
Operating Segments | Refining & Marketing    
Property, Plant and Equipment [Line Items]    
Gross PP&E 33,973 32,965
Accumulated Depreciation 20,129 19,015
Net PP&E 13,844 13,950
Operating Segments | Midstream    
Property, Plant and Equipment [Line Items]    
Gross PP&E 33,399 30,697
Accumulated Depreciation 11,381 10,798
Net PP&E 22,018 19,899
Operating Segments | Renewable Diesel    
Property, Plant and Equipment [Line Items]    
Gross PP&E 969 976
Accumulated Depreciation 380 338
Net PP&E 589 638
Corporate    
Property, Plant and Equipment [Line Items]    
Gross PP&E 1,726 1,679
Accumulated Depreciation 1,193 1,138
Net PP&E $ 533 $ 541
v3.25.3
Fair Value Measurements (Assets and Liabilities Accounted for at Fair Value on Recurring Basis) (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash collateral netted with derivative liabilities $ 12 $ 12
Fair Value, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Contingent consideration, liability 234  
Fair Value, Recurring | Commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - netting and collateral (205) (132)
Derivative asset, net carrying value on balance sheet 22 7
Commodity derivative instruments, assets - collateral pledged not offset 42 16
Commodity derivative instruments, liabilities - netting and collateral (217) (144)
Derivative liability, net carrying value on balance sheet 0 0
Commodity derivative instruments, liabilities - collateral pledged not offset 0 0
Fair Value, Recurring | Embedded derivatives in commodity contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - netting and collateral 0 0
Derivative liability, net carrying value on balance sheet 51 58
Commodity derivative instruments, liabilities - collateral pledged not offset 0 0
Fair Value, Recurring | Level 1 | Commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - gross 227 139
Commodity derivative instruments, liabilities - gross 217 144
Fair Value, Recurring | Level 1 | Embedded derivatives in commodity contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - gross 0 0
Fair Value, Recurring | Level 2 | Commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - gross 0 0
Commodity derivative instruments, liabilities - gross 0 0
Fair Value, Recurring | Level 2 | Embedded derivatives in commodity contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - gross 0 0
Fair Value, Recurring | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Contingent consideration, liability 234  
Fair Value, Recurring | Level 3 | Commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - gross 0 0
Commodity derivative instruments, liabilities - gross 0 0
Fair Value, Recurring | Level 3 | Embedded derivatives in commodity contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - gross $ 51 $ 58
v3.25.3
Fair Value Measurements (Level 3) (Details)
 9 Months Ended
Sep. 30, 2025
$ / gal
USD ($)
Jul. 01, 2025
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Term of contract 5 years  
BANGL, LLC Acquisition    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Contingent consideration, maximum, amount   $ 275,000,000
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Average forward price | $ / gal 0.79  
Probability of renewal second term 100.00%  
Level 3 | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Forward commodity price 0.66  
Level 3 | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Forward commodity price 1.30  
v3.25.3
Fair Value Measurements (Reconciliation of Net Beginning and Ending Balances Recorded for Net Assets and Liabilities Classified as Level 3) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 55 $ 69 $ 58 $ 61
Fair value of contingent consideration as of acquisition date 234 [1] 0 234 [1],[2] 0
Unrealized and realized (gain) loss included in net income(b) [3] (2) 3 1 18
Settlements of derivative instruments (2) (3) (8) (10)
Ending balance $ 285 $ 69 $ 285 $ 69
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of revenues (excludes items below) Cost of revenues (excludes items below) Cost of revenues (excludes items below) Cost of revenues (excludes items below)
[1] Liability recorded in the third quarter of 2025 related to the BANGL Acquisition earnout provision.
[2] See Note 4 - BANGL, LLC Acquisitions.
[3] The (gain) loss is included in cost of revenues on the consolidated statements of income.
v3.25.3
Fair Value Measurements (Gain/Loss Included in Earnings Relating to Assets Still Held at End of Period) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value Disclosures [Abstract]        
The amount of total (gain) loss for the period included in earnings attributable to the change in unrealized (gain) loss relating to liabilities still held at the end of period [1] $ (2) $ 3 $ 1 $ 15
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of revenues (excludes items below) Cost of revenues (excludes items below) Cost of revenues (excludes items below) Cost of revenues (excludes items below)
[1] The (gain) loss is included in cost of revenues on the consolidated statements of income.
v3.25.3
Fair Value Measurements (Fair Values - Reported) (Detail) - USD ($)
$ in Billions
Sep. 30, 2025
Dec. 31, 2024
Reported Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, fair value $ 32.4 $ 26.9
Estimate of Fair Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, fair value $ 31.1 $ 25.0
v3.25.3
Derivatives (Classification of Gross Fair Values of Derivative Instruments, Excluding Cash Collateral) (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Commodity derivatives | Other current assets    
Derivative [Line Items]    
Asset $ 227 $ 139
Liability 217 144
Embedded derivatives in commodity contracts | Other current liabilities    
Derivative [Line Items]    
Asset 0 0
Liability 8 10
Embedded derivatives in commodity contracts | Deferred credits and other liabilities    
Derivative [Line Items]    
Asset 0 0
Liability $ 43 $ 48
v3.25.3
Derivatives (Open Commodity Derivative Contracts) (Details) - Exchange Traded
bbl in Thousands
 9 Months Ended
Sep. 30, 2025
bbl
Crude oil  
Derivative [Line Items]  
Percentage of derivative contracts expiring in the next quarter 86.40%
Crude oil | Long  
Derivative [Line Items]  
Notional contracts (in thousands of total barrels) 55,815
Crude oil | Long | Spread Contracts  
Derivative [Line Items]  
Notional contracts (in thousands of total barrels) 6,910
Crude oil | Short  
Derivative [Line Items]  
Notional contracts (in thousands of total barrels) 55,891
Crude oil | Short | Spread Contracts  
Derivative [Line Items]  
Notional contracts (in thousands of total barrels) 6,976
Refined products  
Derivative [Line Items]  
Percentage of derivative contracts expiring in the next quarter 91.70%
Refined products | Long  
Derivative [Line Items]  
Notional contracts (in thousands of total barrels) 35,257
Refined products | Long | Spread Contracts  
Derivative [Line Items]  
Notional contracts (in thousands of total barrels) 2,283
Refined products | Short  
Derivative [Line Items]  
Notional contracts (in thousands of total barrels) 41,523
Refined products | Short | Spread Contracts  
Derivative [Line Items]  
Notional contracts (in thousands of total barrels) 2,661
Blending products  
Derivative [Line Items]  
Percentage of derivative contracts expiring in the next quarter 79.20%
Blending products | Long  
Derivative [Line Items]  
Notional contracts (in thousands of total barrels) 9,697
Blending products | Short  
Derivative [Line Items]  
Notional contracts (in thousands of total barrels) 12,003
Soybean oil  
Derivative [Line Items]  
Percentage of derivative contracts expiring in the next quarter 98.50%
Soybean oil | Long  
Derivative [Line Items]  
Notional contracts (in thousands of total barrels) 2,197
Soybean oil | Short  
Derivative [Line Items]  
Notional contracts (in thousands of total barrels) 2,981
v3.25.3
Derivatives (Effect of Commodity Derivative Instruments in Statements of Income) (Detail) - Commodity derivatives - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) $ (4) $ 41 $ (37) $ (82)
Sales and other operating revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) 0 4 0 2
Cost of revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) (6) 38 (42) (82)
Other income        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) $ 2 $ (1) $ 5 $ (2)
v3.25.3
Debt (Outstanding Borrowings) (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Total debt $ 33,282 $ 27,797
Unamortized debt issuance costs (210) (142)
Unamortized discount, net of unamortized premium (228) (174)
Amounts due within one year (1,612) (3,049)
Long-term debt 31,232 24,432
MPC:    
Finance lease obligations 665 718
Total debt 7,275 6,591
MPC: | Senior notes    
Long-term debt, gross 6,449 5,699
MPC: | Bonds    
Other long-term debt 161 174
MPLX:    
Finance lease obligations 7 6
Total debt 26,007 21,206
MPLX: | Senior notes    
Long-term debt, gross $ 26,000 $ 21,200
v3.25.3
Debt (MPC Senior Notes) (Details) - MPC: - Senior notes - USD ($)
$ in Millions
May 01, 2025
Sep. 16, 2024
Feb. 10, 2025
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 2,000
Senior notes, 5.150% due March 2030      
Debt Instrument [Line Items]      
Debt instrument, face amount     1,100
Senior notes, 5.700% due March 2035      
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 900
Senior notes, 3.625% due September 2024      
Debt Instrument [Line Items]      
Repayments of debt   $ 750  
Senior notes, 4.700% due May 2025      
Debt Instrument [Line Items]      
Repayments of debt $ 1,250    
v3.25.3
Debt (MPLX Senior Notes) (Details) - MPLX: - Senior notes - USD ($)
$ in Millions
Apr. 09, 2025
Feb. 18, 2025
Aug. 11, 2025
Mar. 10, 2025
Debt Instrument [Line Items]        
Debt instrument, face amount     $ 4,500 $ 2,000
Senior notes, 4.000% due February 2025        
Debt Instrument [Line Items]        
Repayments of debt   $ 500    
Senior notes, 5.400% due April 2035        
Debt Instrument [Line Items]        
Debt instrument, face amount       1,000
Senior notes, 5.950% due April 2055        
Debt Instrument [Line Items]        
Debt instrument, face amount       $ 1,000
Senior notes, 4.875% due June 2025        
Debt Instrument [Line Items]        
Repayments of debt $ 1,189      
Senior notes, 4.875% due June 2025 | MarkWest        
Debt Instrument [Line Items]        
Repayments of debt $ 11      
Senior notes, 4.800%, due February 2031        
Debt Instrument [Line Items]        
Debt instrument, face amount     1,250  
Senior notes. 5.000%, due January 2033        
Debt Instrument [Line Items]        
Debt instrument, face amount     750  
Senior notes, 5.400%, due September 2035        
Debt Instrument [Line Items]        
Debt instrument, face amount     1,500  
Senior notes, 6.200%, due September 2055        
Debt Instrument [Line Items]        
Debt instrument, face amount     $ 1,000  
v3.25.3
Debt (Available Capacity under our Facilities) (Details)
$ in Millions
Sep. 30, 2025
USD ($)
MPC bank revolving credit facility due July 2027  
Debt Instrument [Line Items]  
Total Capacity $ 5,000
Outstanding Borrowings 0
Outstanding Letters of Credit 1
Available Capacity $ 4,999
Weighted Average Interest Rate 0.00%
MPC trade receivables securitization facility due September 2027  
Debt Instrument [Line Items]  
Total Capacity $ 100 [1]
Outstanding Borrowings 0
Outstanding Letters of Credit 0
Available Capacity $ 100
Weighted Average Interest Rate 0.00%
Maximum borrowing capacity $ 100
MPLX LP | MPLX bank revolving credit facility due July 2027  
Debt Instrument [Line Items]  
Total Capacity 2,000
Outstanding Borrowings 0
Outstanding Letters of Credit 0
Available Capacity $ 2,000
Weighted Average Interest Rate 0.00%
[1] The committed borrowing and letter of credit issuance capacity under the trade receivables securitization facility is $100 million. In addition, the facility allows for the issuance of letters of credit in excess of the committed capacity at the discretion of the issuing banks.
v3.25.3
Revenue (Disaggregated by Product Line) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Sales and other operating revenues [1] $ 34,809 $ 35,107 $ 100,125 $ 105,727
Refining & Marketing        
Sales and other operating revenues [1] 32,647 33,298 93,932 100,435
Refining & Marketing | Refined products        
Sales and other operating revenues 30,525 30,987 87,897 93,329
Refining & Marketing | Crude oil        
Sales and other operating revenues 1,586 1,826 4,570 5,713
Refining & Marketing | Services and other        
Sales and other operating revenues 536 485 1,465 1,393
Midstream        
Sales and other operating revenues [1] 1,449 1,332 4,230 3,813
Midstream | Refined products        
Sales and other operating revenues 527 431 1,529 1,197
Midstream | Services and other        
Sales and other operating revenues 922 901 2,701 2,616
Renewable Diesel        
Sales and other operating revenues 713 477 1,963 1,479
Renewable Diesel | Refined products        
Sales and other operating revenues 709 475 1,953 1,474
Renewable Diesel | Services and other        
Sales and other operating revenues $ 4 $ 2 $ 10 $ 5
[1] Includes sales to related parties. See Note 6 for additional information. See Note 17 for the disaggregation of our revenue from external customers by segment and product line.
v3.25.3
Revenue (Details)
$ in Millions
Sep. 30, 2025
USD ($)
Revenue from Contract with Customer [Abstract]  
Matching buy/sell receivables $ 3,910
v3.25.3
Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
 [4]
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net cash provided by operating activities included:        
Interest paid (net of amounts capitalized)     $ 970 $ 959
Net income taxes paid to (received from) taxing authorities     130 [1] 613
Income tax credits and adjustments     111 439
Non-cash investing and financing activities:        
Contribution of assets     115 [2] 0
Book value of equity method investment     282 [3] 0
Fair value of contingent consideration as of acquisition date $ 234 $ 0 $ 234 [4],[5] $ 0
[1] ncludes $111 million and $439 million in the nine months ended September 30, 2025 and September 30, 2024, respectively, paid to third parties for transferable tax credits.
[2] Represents the book value of assets contributed by MPLX to a joint venture.
[3] Represents the book value of MPLX’s equity method investment in BANGL, prior to MPLX buying out the remaining interest in this entity as part of the BANGL Acquisition. See Note 4 - BANGL, LLC Acquisitions.
[4] Liability recorded in the third quarter of 2025 related to the BANGL Acquisition earnout provision.
[5] See Note 4 - BANGL, LLC Acquisitions.
v3.25.3
Supplemental Cash Flow Information (Reconciliation of Additions to Property, Plant and Equipment to Total Capital Expenditures) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Supplemental Cash Flow Elements [Abstract]        
Additions to property, plant and equipment per the consolidated statements of cash flows     $ 2,305 $ 1,723
Increase (decrease) in capital accruals     105 (18)
Capital expenditures [1] $ 1,057 $ 679 $ 2,410 $ 1,705
[1] Includes changes in capital expenditure accruals. See Note 18 for a reconciliation of total capital expenditures to additions to property, plant and equipment for the nine months ended September 30, 2025 and 2024 as reported in the consolidated statements of cash flows.
v3.25.3
Other Current Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Other Liabilities Disclosure [Abstract]    
Environmental credits liability $ 768 $ 422
Accrued interest payable 329 314
Other current liabilities 513 419
Total other current liabilities $ 1,610 $ 1,155
v3.25.3
Accumulated Other Comprehensive Income (Loss) (Changes in Accumulated Other Comprehensive Loss by Component) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated other comprehensive (income) loss, other, after tax, beginning balance     $ (1)     $ 1 $ (1) $ 1
Accumulated other comprehensive loss, beginning balance     (114)     (131) (114) (131)
Other comprehensive income (loss), before reclassifications, net of tax             11 0
Amounts reclassified from accumulated other comprehensive loss:                
Amortization of prior service credit             (22) (41)
Amortization of actuarial loss             12 5
Settlement loss             1  
Other             1  
Tax effect             2 9
Other comprehensive income (loss) $ (1) $ 1 5 $ (6) $ (9) (12) 5 (27)
Accumulated other comprehensive (income) loss, other, after tax, ending balance 0     0     0 0
Accumulated other comprehensive loss, ending balance (109)     (158)     (109) (158)
Other comprehensive income (loss) before reclassifications, tax             4 1
Pension Benefits                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated other comprehensive (income) loss, defined benefit plan, after tax, beginning balance     (235)     (261) (235) (261)
Amounts reclassified from accumulated other comprehensive loss:                
Accumulated other comprehensive (income) loss, defined benefit plan, after tax, ending balance (221)     (274)     (221) (274)
Other Benefits                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated other comprehensive (income) loss, defined benefit plan, after tax, beginning balance     $ 122     $ 129 122 129
Amounts reclassified from accumulated other comprehensive loss:                
Accumulated other comprehensive (income) loss, defined benefit plan, after tax, ending balance $ 112     $ 116     112 116
Accumulated Defined Benefit Plans Adjustment | Pension Benefits                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive income (loss), before reclassifications, net of tax             9 2
Amounts reclassified from accumulated other comprehensive loss:                
Amortization of prior service credit [1]             (6) (25)
Amortization of actuarial loss [1]             12 5
Settlement loss [1]             1  
Tax effect             (2) 5
Other comprehensive income (loss)             14 (13)
Accumulated Defined Benefit Plans Adjustment | Other Benefits                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive income (loss), before reclassifications, net of tax             2 (1)
Amounts reclassified from accumulated other comprehensive loss:                
Amortization of prior service credit [1]             (16) (16)
Amortization of actuarial loss [1]             0 0
Settlement loss             0  
Tax effect             4 4
Other comprehensive income (loss)             (10) (13)
Other                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive income (loss), before reclassifications, net of tax             0 (1)
Amounts reclassified from accumulated other comprehensive loss:                
Other             1  
Tax effect             0 0
Other comprehensive income (loss)             $ 1 $ (1)
[1] These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 21.
v3.25.3
Pension and Other Postretirement Benefits (Components of Net Periodic Benefit Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits        
Components of net periodic benefit cost:        
Service cost $ 56 $ 63 $ 168 $ 170
Interest cost 36 31 108 92
Expected return on plan assets (36) (36) (108) (110)
Amortization of prior service credit (2) (9) (6) (25)
Amortization of actuarial loss 4 3 12 5
Settlement loss 0 0 1 0
Net periodic benefit cost 58 52 175 132
Other Benefits        
Components of net periodic benefit cost:        
Service cost 5 5 15 15
Interest cost 9 8 26 24
Amortization of prior service credit (5) (5) (16) (16)
Net periodic benefit cost $ 9 $ 8 $ 25 $ 23
v3.25.3
Pension and Other Postretirement Benefits (Additional Information) (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Employer contributions $ 191
Other Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
Benefits paid 7
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Benefits paid $ 39
v3.25.3
Commitments and Contingencies (Environmental Matters) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]    
Accrued liabilities for remediation $ 339 $ 364
Receivables for recoverable costs $ 3 $ 6
v3.25.3
Commitments and Contingencies (Other Legal Proceedings) (Details) - USD ($)
$ in Millions
 1 Months Ended
Dec. 15, 2020
Jul. 31, 2020
Commitments and Contingencies Disclosure [Abstract]    
Loss contingency, damages sought, value   $ 187
Loss contingency, damages paid, value $ 4  
v3.25.3
Commitments and Contingencies (Guarantees) (Details)
$ in Millions
Sep. 30, 2025
USD ($)
Other Guarantees  
Loss Contingencies [Line Items]  
Maximum potential undiscounted payments $ 185
LOOP and LOCAP LLC | Guarantee of Indebtedness of Others | Financial Guarantee  
Loss Contingencies [Line Items]  
Maximum potential undiscounted payments $ 212
Bakken Pipeline System | Indirect  
Loss Contingencies [Line Items]  
Ownership percentage 9.19%
Bakken Pipeline System | Guarantee of Indebtedness of Others | Financial Guarantee  
Loss Contingencies [Line Items]  
Maximum potential undiscounted payments $ 78