Cover - shares	6 Months Ended
Cover - shares	Jun. 30, 2021	Aug. 05, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-03040
Entity Registrant Name	QWEST CORPORATION
Entity Incorporation, State or Country Code	CO
Entity Tax Identification Number	84-0273800
Entity Address, Address Line One	100 CenturyLink Drive,
Entity Address, City or Town	Monroe,
Entity Address, State or Province	LA
Entity Address, Postal Zip Code	71203
City Area Code	318
Local Phone Number	388-9000
Entity Information [Line Items]
Document Period End Date	Jun. 30, 2021
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		1
Entity Central Index Key	0000068622
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false
6.5% Notes Due 2056
Entity Information [Line Items]
Title of 12(b) Security	6.5% Notes Due 2056
Trading Symbol(s)	CTBB
Security Exchange Name	NYSE
6.75% Notes Due 2057
Entity Information [Line Items]
Title of 12(b) Security	6.75% Notes Due 2057
Trading Symbol(s)	CTDD
Security Exchange Name	NYSE

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
OPERATING REVENUE
Total operating revenue	$ 1,724	$ 1,799	$ 3,516	$ 3,717
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	440	490	879	963
Selling, general and administrative	106	139	213	282
Operating expenses—affiliates	190	164	384	359
Depreciation and amortization	231	327	548	655
Total operating expenses	967	1,120	2,024	2,259
OPERATING INCOME	757	679	1,492	1,458
OTHER (EXPENSE) INCOME
Interest expense	(47)	(75)	(95)	(150)
Interest expense—affiliate, net	(31)	(16)	(62)	(32)
Other income (expense), net	2	(5)	(4)	(13)
Total other expense, net	(76)	(96)	(161)	(195)
INCOME BEFORE INCOME TAX EXPENSE	681	583	1,331	1,263
Income tax expense	172	153	340	330
NET INCOME	509	430	991	933
Non-affiliate services
OPERATING REVENUE
Total operating revenue	1,147	1,207	2,317	2,442
Affiliate Services [Member]
OPERATING REVENUE
Total operating revenue	$ 577	$ 592	$ 1,199	$ 1,275

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
CURRENT ASSETS
Cash and cash equivalents	$ 7	$ 14
Accounts receivable, less allowance of $44 and $61	327	364
Other	137	122
Total current assets	471	500
Property, plant and equipment, net of accumulated depreciation of $8,719 and $8,347	8,200	8,309
GOODWILL AND OTHER ASSETS
Goodwill	9,360	9,360
Other intangible assets, net	231	343
Other, net	146	147
Total goodwill and other assets	9,737	9,850
TOTAL ASSETS	18,408	18,659
CURRENT LIABILITIES
Current maturities of long-term debt	949	948
Accounts payable	232	292
Advances from affiliates	203	592
Note payable - affiliate	1,158	1,130
Accrued expenses and other liabilities
Salaries and benefits	158	178
Income and other taxes	110	95
Other	193	186
Current portion of deferred revenue	182	183
Total current liabilities	3,185	3,604
LONG-TERM DEBT	2,156	2,386
DEFERRED CREDITS AND OTHER LIABILITIES
Deferred income taxes, net	1,233	1,249
Affiliate obligations, net	628	637
Other	687	685
Total deferred credits and other liabilities	2,548	2,571
COMMITMENTS AND CONTINGENCIES (Note 7)
STOCKHOLDER'S EQUITY
Common stock - one share without par value, owned by Qwest Services Corporation	10,050	10,050
Retained earnings	469	48
Total stockholder's equity	10,519	10,098
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 18,408	$ 18,659

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 44	$ 61
PP&E, accumulated depreciation	$ 8,719	$ 8,347
Common stock, share issued (in shares)	1	1
Common stock, share outstanding (in shares)	1	1

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
OPERATING ACTIVITIES
Net income	$ 991	$ 933
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	548	655
Deferred income taxes	(16)	(19)
Provision for uncollectible accounts	12	31
Accrued interest on affiliate note	28	31
Net loss on early retirement of debt	8	19
Changes in current assets and liabilities:
Accounts receivable	25	73
Accounts payable	(23)	(69)
Accrued income and other taxes	15	38
Other current assets and liabilities, net	(52)	(197)
Changes in other noncurrent assets and liabilities, net	2	17
Changes in affiliate obligations, net	(9)	(36)
Other, net	21	8
Net cash provided by operating activities	1,550	1,484
INVESTING ACTIVITIES
Capital expenditures	(372)	(606)
Changes in advances to affiliates	0	1,360
Proceeds from sale of property, plant and equipment and other assets	9	1
Net cash (used in) provided by investing activities	(363)	755
FINANCING ACTIVITIES
Payments of long-term debt	(235)	(1,311)
Dividends paid	(570)	(925)
Changes in advances from affiliates	(389)	0
Net cash used in financing activities	(1,194)	(2,236)
Net (decrease) increase in cash, cash equivalents and restricted cash	(7)	3
Cash, cash equivalents and restricted cash at beginning of period	15	4
Cash, cash equivalents and restricted cash at end of period	8	7
Supplemental cash flow information:
Income taxes paid, net	(352)	(336)
Interest paid (net of capitalized interest of $9 and $17)	(97)	(172)
Cash, cash equivalents and restricted cash:
Cash and cash equivalents	7	5
Restricted cash - noncurrent	1	2
Total	$ 8	$ 7

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement of Cash Flows [Abstract]
Interest paid, capitalized interest	$ 9	$ 17

CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY - USD ($) $ in Millions	Total	COMMON STOCK	RETAINED EARNINGS	RETAINED EARNINGS Cumulative Effect, Period of Adoption, Adjustment
Balance at beginning of period at Dec. 31, 2019		$ 10,050	$ 67	$ 3
Increase (Decrease) in Stockholder's Equity
Net income	$ 933		933
Dividends declared and paid to Qwest Services Corporation	(925)		(925)
Other			(5)
Balance at end of period at Jun. 30, 2020	10,123	10,050	73
Balance at beginning of period at Mar. 31, 2020		10,050	68
Increase (Decrease) in Stockholder's Equity
Net income	430		430
Dividends declared and paid to Qwest Services Corporation			(425)
Other			0
Balance at end of period at Jun. 30, 2020	10,123	10,050	73
Balance at beginning of period at Dec. 31, 2020	10,098	10,050	48
Increase (Decrease) in Stockholder's Equity
Net income	991		991
Dividends declared and paid to Qwest Services Corporation	(570)		(570)
Other			0
Balance at end of period at Jun. 30, 2021	10,519	10,050	469
Balance at beginning of period at Mar. 31, 2021		10,050	230
Increase (Decrease) in Stockholder's Equity
Net income	509		509
Dividends declared and paid to Qwest Services Corporation			(270)
Other			0
Balance at end of period at Jun. 30, 2021	$ 10,519	$ 10,050	$ 469

- Definition

Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY (parenthetical) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
RETAINED EARNINGS \| Cumulative Effect, Period of Adoption, Adjustment
Income Tax (Expense) Benefit	$ (1)

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Background	6 Months Ended
Background	Jun. 30, 2021
Accounting Policies [Abstract]
Background	Background General We are an integrated communications company engaged primarily in providing a broad array of communications services to our mass markets and business customers. Our specific products and services are detailed in Note 3—Revenue Recognition of this report. We generate the majority of our total consolidated operating revenue from services provided in the 14-state region of Arizona, Colorado, Idaho, Iowa, Minnesota, Montana, Nebraska, New Mexico, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming. We refer to this region as our local service area. Basis of Presentation Our consolidated balance sheet as of December 31, 2020, which was derived from our audited consolidated financial statements, and our unaudited interim consolidated financial statements provided herein have been prepared in accordance with the instructions for Form 10-Q. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") have been condensed or omitted pursuant to rules and regulations of the U.S. Securities and Exchange Commission ("SEC"); however, in our opinion, the disclosures made are adequate to make the information presented not misleading. We believe that these consolidated financial statements include all normal recurring adjustments necessary to fairly present the results for the interim periods. The consolidated results of operations and cash flows for the first six months of the year are not necessarily indicative of the consolidated results of operations and cash flows that might be expected for the entire year. These consolidated financial statements and the accompanying notes should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2020. The accompanying consolidated financial statements include our accounts and the accounts of our subsidiaries. Intercompany amounts and transactions with our consolidated subsidiaries have been eliminated. Transactions with our non-consolidated affiliates (referred to herein as affiliates) have not been eliminated. We reclassified certain prior period amounts to conform to the current period presentation, including our revenue by product and service categories. See Note 3—Revenue Recognition for additional information. These changes had no impact on total operating revenue, total operating expenses or net income for any period. Operating lease assets are included in Other, net under goodwill and other assets on our consolidated balance sheets. Current operating lease liabilities are included in Other under accrued expenses and other liabilities on our consolidated balance sheets. Noncurrent operating lease liabilities are included in Other under deferred credits and other liabilities on our consolidated balance sheets. Segments Our operations are integrated into and reported as part of Lumen Technologies. Lumen's chief operating decision maker ("CODM") is our CODM but reviews our financial information on an aggregate basis only in connection with our quarterly and annual reports that we file with the SEC. Consequently, we do not provide our discrete financial information to the CODM on a regular basis. As such, we have one reportable segment. Summary of Significant Accounting Policies Refer to the significant accounting policies described in Note 1—Background and Summary of Significant Accounting Policies to the consolidated financial statements and accompanying notes in Part II Item 8 of our Annual Report on Form 10-K for the year ended December 31, 2020. Recently Adopted Accounting Pronouncements Debt On January 1, 2021, we adopted ASU 2020-09, "Debt (Topic 470) Amendments to SEC Paragraphs Pursuant to SEC Release No. 33-10762" ("ASU 2020-09"). This ASU amends and supersedes various SEC paragraphs to reflect SEC Release No. 33-10762, which includes amendments to the financial disclosure requirements applicable to registered debt offerings that include credit enhancements, such as subsidiary guarantees. The adoption of ASU 2020-09 did not have an impact to our consolidated financial statements. Investments On January 1, 2021, we adopted ASU 2020-01, "Investments - Equity Securities (Topic 321), Investments - Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) - Clarifying the Interactions between Topic 321, Topic 323, and Topic 815)" ("ASU 2020-01"). This ASU, among other things, clarifies that a company should consider observable transactions that require a company to either apply or discontinue the equity method of accounting under Topic 323, Investments - Equity Method and Joint Ventures, for the purposes of applying the measurement alternative in accordance with Topic 321 immediately before applying or upon discontinuing the equity method. As of June 30, 2021, we determined there was no application or discontinuation of the equity method during the reporting periods. The adoption of ASU 2020-01 did not have an impact to our consolidated financial statements. Income taxes On January 1, 2021, we adopted ASU 2019-12, "Simplifying the Accounting for Income Taxes (Topic 740)" ("ASU 2019-12"). This ASU removes certain exceptions for investments, intra-period allocations and interim calculations, and adds guidance to reduce complexity in accounting for income taxes. The adoption of ASU 2019-12 did not have a material impact to our consolidated financial statements. Measurement of Credit Losses on Financial Instruments We adopted ASU 2016-13, "Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13") on January 1, 2020 and recognized a cumulative adjustment to our accumulated deficit as of the date of adoption of $3 million, net of tax effect of $1 million. Please refer to Note 4—Credit Losses on Financial Instruments for more information. Recently Issued Accounting Pronouncements In March 2020, the FASB issued ASU 2020-04, "Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting" ("ASU 2020-04" or "Reference Rate Reform"), designed to ease the burden of accounting for contract modifications related to the global market-wide reference rate transition period. Subject to certain criteria, ASU 2020-04 provides qualifying entities the option to apply expedients and exceptions to contract modifications and hedging accounting relationships made until December 31, 2022. These amendments are effective immediately and may be applied prospectively to contract modifications made and hedging relationships entered into or evaluated on or before December 31, 2022. ASU 2020-04 provides optional guidance for a limited time to ease the potential burden in accounting for reference rate reform. Based on our review of our key material contracts through June 30, 2021, we do not expect ASU 2020-04 to have any material impact on the consolidated financial statements.

Goodwill, Customer Relationships and Other Intangible Assets

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill, Customer Relationships and Other Intangible Assets

Goodwill, customer relationships and other intangible assets consisted of the following:


	June 30, 2021		December 31, 2020
	(Dollars in millions)
Goodwill	$	9,360	9,360
Customer relationships, less accumulated amortization of $5,699 and $5,611	$	—	88
Other intangible assets, less accumulated amortization of $1,842 and $1,831	231		255
Total other intangible assets, net	$	231	343

Substantially all of our goodwill was derived from Lumen's acquisition of us where the purchase price exceeded the fair value of the net assets acquired.

We assess our goodwill for impairment annually as of October 31, or, under certain circumstances, more frequently, such as when events or changes in circumstances indicate there may be impairment. We are required to write-down the value of goodwill in periods in which the carrying value of equity exceeds the estimated fair value of equity, limited to the amount of goodwill. Goodwill is evaluated for impairment at the reporting unit level, and we have determined that we have one reporting unit.

As of June 30, 2021, the gross carrying amount of goodwill, customer relationships and other intangible assets was $17.1 billion. The amortization expense for intangible assets for the three months ended June 30, 2021 and 2020 totaled $22 million and $121 million, respectively. The amortization expense for intangible assets for the six months ended June 30, 2021 and 2020 totaled $132 million and $245 million, respectively.

We estimate that total amortization expense for intangible assets for the years ending December 31, 2021 through 2025 will be as follows:


	(Dollars in millions)
2021 (remaining six months)	$	43
2022	85
2023	60
2024	12
2025	10

Revenue Recognition

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenue Recognition

Beginning in the first quarter of 2021, we categorize our products, services and revenue among the following four categories:

•Voice and Other, which include primarily local voice services, private line and other legacy services. This category also includes Universal Service Fund ("USF") and Connect America Fund Phase II ("CAF II") support payments and other operating revenue. We receive support payments from state USF programs and from the federal CAF II program. These support payments are government subsidies designed to compensate us for providing certain broadband and telecommunications services in high-cost areas or at discounts to low-income, educational, and healthcare customers. During the six months ended June 30, 2021 we recorded approximately $73 million of revenue from the CAF II program that will end as of December 31, 2021.

•Fiber Infrastructure Services, which include high speed, fiber-based and lower speed DSL-based broadband services, and optical network services;

•IP and Data Services, which consist primarily of Ethernet services; and

•Affiliate Services, which are communications services that we also provide to external customers. In addition, we provide to our affiliates application development and support services, network support and technical services.

Reconciliation of Total Revenue to Revenue from Contracts with Customers

The following tables provide our total revenue by product and service category as well as the amount of revenue that is not subject to ASC 606, "Revenue from Contracts with Customers" ("ASC 606"), but is instead governed by other accounting standards:


	Three Months Ended June 30, 2021				Three Months Ended June 30, 2020
	Total Revenue		Adjustments for Non-ASC 606 Revenue (1)	Total Revenue from Contracts with Customers	Total Revenue	Adjustments for Non-ASC 606 Revenue (1)	Total Revenue from Contracts with Customers
	(Dollars in millions)
Voice and other	$	530	(83)	447	569	(87)	482
Fiber Infrastructure	501		(29)	472	509	(33)	476
IP and Data Services	116		—	116	129	—	129
Affiliate Services	577		(6)	571	592	(1)	591
Total revenue	$	1,724	(118)	1,606	1,799	(121)	1,678

____________________________________________________________________

(1)Includes regulatory revenue and lease revenue not within the scope of ASC 606.


	Six Months Ended June 30, 2021				Six Months Ended June 30, 2020
	Total Revenue		Adjustments for Non-ASC 606 Revenue (1)	Total Revenue from Contracts with Customers	Total Revenue	Adjustments for Non-ASC 606 Revenue (1)	Total Revenue from Contracts with Customers
	(Dollars in millions)
Voice and other	$	1,073	(168)	905	1,159	(176)	983
Fiber Infrastructure	1,005		(60)	945	1,022	(64)	958
IP and Data Services	239		—	239	261	—	261
Affiliate Services	1,199		(9)	1190	1,275	(2)	1,273
Total revenue	$	3,516	(237)	3,279	3,717	(242)	3,475

____________________________________________________________________

(1)Includes regulatory revenue and lease revenue not within the scope of ASC 606.

Operating Lease Revenue

Qwest leases various data transmission capacity, office facilities, switching facilities and other network sites to third parties under operating leases. Lease and sublease revenue are included in operating revenue in our consolidated statements of operations.

For both the three months ended June 30, 2021 and 2020, our gross rental income was $78 million, which represents approximately 5% and 4%, respectively, of our operating revenue for the three months ended June 30, 2021 and 2020. For both the six months ended June 30, 2021 and 2020, our gross rental income was $157 million, which represents approximately 4% of our operating revenue for both periods.

Customer Receivables and Contract Balances

The following table provides balances of customer receivables, contract assets and contract liabilities as of June 30, 2021 and December 31, 2020:


	June 30, 2021		December 31, 2020
	(Dollars in millions)
Customer receivables (1)	$	304	346
Contract assets	11		13
Contract liabilities	323		300

______________________________________________________________________

(1)Reflects gross customer receivables, including gross affiliate receivables, of $340 million and $396 million, net of allowance for doubtful accounts of $36 million and $50 million, at June 30, 2021 and December 31, 2020, respectively.

Contract liabilities consist of consideration we have received from our customers or billed in advance of providing goods or services promised in the future. We defer recognizing this consideration as revenue until we have satisfied the related performance obligation to the customer. Contract liabilities include recurring services billed one month in advance and installation and maintenance charges that are deferred and recognized over the actual or expected contract term, which ranges from one to five years depending on the service. Contract liabilities are included within deferred revenue in our consolidated balance sheets. During the three and six months ended June 30, 2021, we recognized $12 million and $175 million, respectively, of revenue that was included in contract liabilities as of January 1, 2021. During the three and six months ended June 30, 2020, we recognized $13 million and $197 million, respectively, of revenue that was included in contract liabilities as of January 1, 2020.

Performance Obligations

As of June 30, 2021, our estimated revenue expected to be recognized in the future related to performance obligations associated with existing customer contracts that are partially or wholly unsatisfied is approximately $204 million. We expect to recognize approximately 90% of this revenue through 2023, with the balance recognized thereafter.

These amounts exclude (i) the value of unsatisfied performance obligations for contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed (for example, uncommitted usage or non-recurring charges associated with professional or technical services to be completed), and (ii) contracts that are classified as leasing arrangements that are not subject to ASC 606.

Contract Costs

The following tables provide changes in our contract acquisition costs and fulfillment costs:


	Three Months Ended June 30, 2021			Three Months Ended June 30, 2020
	Acquisition Costs		Fulfillment Costs	Acquisition Costs	Fulfillment Costs
	(Dollars in millions)
Beginning of period balance	$	69	52	84	61
Costs incurred	13		6	13	6
Amortization	(14)		(9)	(16)	(8)
End of period balance	$	68	49	81	59


	Six Months Ended June 30, 2021			Six Months Ended June 30, 2020
	Acquisition Costs		Fulfillment Costs	Acquisition Costs	Fulfillment Costs
	(Dollars in millions)
Beginning of period balance	$	73	54	86	64
Costs incurred	24		12	27	12
Amortization	(29)		(17)	(32)	(17)
End of period balance	$	68	49	81	59

Acquisition costs include commission fees paid to employees as a result of obtaining contracts. Fulfillment costs include third party and internal costs associated with the provision, installation and activation of communications services to customers, including labor and materials consumed for these activities.

Deferred acquisition and fulfillment costs are amortized based on the transfer of services on a straight-line basis over the average customer life of 30 months for mass markets customers and average contract life of 29 months for business customers. Amortized fulfillment costs are included in cost of services and products and amortized acquisition costs are included in selling, general and administrative expenses in our consolidated statements of operations. The amount of these deferred costs that are anticipated to be amortized in the next 12 months are included in other current assets on our consolidated balance sheets. The amount of deferred costs expected to be amortized beyond the next 12 months is included in other non-current assets on our consolidated balance sheets. Deferred acquisition and fulfillment costs are assessed for impairment on an annual basis.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Credit Losses on Financial Instruments

6 Months Ended

Jun. 30, 2021

Credit Loss [Abstract]

Credit Losses on Financial Instruments

Credit Losses on Financial InstrumentsIn accordance with ASC 326, "Financial Instruments - Credit Losses," we aggregate financial assets with similar risk characteristics to align our expected credit losses with the credit quality or deterioration over the life of such assets. We monitor certain risk characteristics within our aggregated financial assets and revise their composition accordingly, to the extent internal and external risk factors change each reporting period. Financial assets that do not share risk characteristics with other financial assets are evaluated separately. Our financial assets measured at amortized cost primarily consist of accounts receivable.

We use a loss rate method to estimate our allowance for credit losses. Our determination of the current expected credit loss rate begins with our use of historical loss experience as a percentage of accounts receivable. We measure our historical loss period based on the average days to recognize accounts receivable as credit losses. When asset specific characteristics and current conditions change from those in the historical period, due to changes in our credit and collections strategy, certain classes of aged balances, or credit loss and recovery policies, we perform a qualitative and quantitative assessment to adjust our historical loss rate. We use regression analysis to develop an expected loss rate using historical experience and economic data over a forecast period. We measure our forecast period based on the average days to collect payment on billed accounts receivable. To determine our current allowance for credit losses, we combine the historical and expected credit loss rates and apply them to our period end accounts receivable.

In conjunction with an internal reorganization and changes to how we manage our customers, we pooled certain assets with similar credit risk characteristics based on the nature of our customers, their industry, policies used to grant credit terms and their historical and expected credit loss patterns. Additionally, we reassessed our historical loss period for the portfolio reorganization.

If there is a deterioration of a customer's financial condition or if future default rates in general differ from currently anticipated default rates (including changes caused by COVID-19), we may need to adjust the allowance for credit losses, which would affect earnings in the period that adjustments are made.

The assessment of the correlation between historical observed default rates, current conditions and forecasted economic conditions requires judgment. Alternative interpretations of these factors could have resulted in different conclusions regarding the allowance for credit losses. The amount of credit loss is sensitive to changes in circumstances and forecasted economic conditions. Our historical credit loss experience, current conditions and forecast of economic conditions may also not be representative of the customers' actual default experience in the future.

The following table presents the activity of our allowance for credit losses by accounts receivable portfolio for the six months ended June 30, 2021:


	Business		Mass Markets	Total
	(Dollars in millions)
Beginning balance at January 1, 2021 (1)	$	25	36	61
Provision for expected losses	5		7	12
Write-offs charged against the allowance	(11)		(27)	(38)
Recoveries collected	1		8	9
Ending balance at June 30, 2021	$	20	24	44

(1) Due to an internal reorganization of our reporting categories on January 1, 2021, our accounts receivable portfolios were changed to align with changes to how we manage our customers. Allowance for credit losses previously included in the Consumer and Business portfolio of $32 million and $4 million, respectively, were reclassified to the Mass Markets allowance for credit losses on January 1, 2021, as a result of this change.

For the six months ended June 30, 2021, we decreased our allowance for credit losses for our business and mass markets accounts receivable portfolios primarily due to higher write-off activity in the quarter with the easing of prior delays due to COVID-19 related restrictions in 2020.

- Definition

The entire disclosure for credit loss on financial instrument measured at amortized cost basis, net investment in lease, off-balance sheet credit exposure, and available-for-sale debt security.

+ References + Details

Long-Term Debt and Note Payable - Affiliate

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Long-Term Debt and Note Payable - Affiliate

The following chart reflects (i) the consolidated long-term debt of Qwest Corporation and its subsidiaries, including finance lease and other obligations, unamortized premiums, net, unamortized debt issuance costs and (ii) note payable - affiliate:


	Interest Rates (1)	Maturities (1)	June 30, 2021		December 31, 2020
			(Dollars in millions)
Senior notes	6.500% - 7.750%	2021 - 2057	$	2,935	3,170
Term loan (2) (3)	LIBOR + 2.00%	2027	215		215
Finance lease and other obligations	Various	Various	3		6
Unamortized premiums, net			5		5
Unamortized debt issuance costs			(53)		(62)
Total long-term debt			3,105		3,334
Less current maturities			(949)		(948)
Long-term debt, excluding current maturities			$	2,156	2,386
Note payable - affiliate	4.883%	2022	$	1,158	1,130

_______________________________________________________________________________

(1)As of June 30, 2021.

(2)Qwest Corporation's Term Loan had interest rates of 2.110% as of June 30, 2021 and 2.150% as of December 31, 2020.

(3)See Note 1— Background for our considerations of the impact of Reference Rate Reform on our debt subject to rate reference changes from LIBOR.

Long-Term Debt Maturities

Set forth below is the aggregate principal amount of our long-term debt as of June 30, 2021 (excluding unamortized premiums, net and unamortized debt issuance costs and note payable-affiliate) maturing during the following years:


	(Dollars in millions)
2021 (remaining six months)	$	951
2022	1
2023	—
2024	—
2025	250
2026 and thereafter	1,951
Total long-term debt	$	3,153

Redemption of Senior Notes

On February 16, 2021, we fully redeemed all $235 million aggregate principal amount of our outstanding 7.000% Senior Notes due 2056. The redemption of the Senior Notes resulted in a loss of $8 million for the six months ended June 30, 2021.

Note Payable - Affiliate

Qwest Corporation is currently indebted to an affiliate of our ultimate parent company, Lumen Technologies, Inc., under a revolving promissory note that provides Qwest Corporation with a funding commitment of up to $965 million in aggregate principal amount (the "Intercompany Note"). The outstanding principal balance owed by Qwest Corporation under the Intercompany Note and the accrued interest thereon is due and payable on demand, but if no demand is made, then on June 30, 2022. Interest is accrued on the outstanding principal balance during the respective interest period using a weighted average per annum interest rate on the consolidated outstanding debt of Lumen Technologies, Inc. and its subsidiaries. As of June 30, 2021 and December 31, 2020, the Intercompany Note is reflected on our consolidated balance sheets as a current liability under "Note payable - affiliate". In accordance with the terms of the Intercompany Note, interest shall be assessed on June 30th and December 31st (an "Interest Period"). Any assessed interest for an Interest Period that remains unpaid on the last day of the subsequent Interest Period is capitalized to the outstanding principal balance on such date. Due to the amount of the unpaid interest capitalized since inception of the Intercompany Note, the outstanding principal balance at June 30, 2021 is approximately $1.2 billion. Additionally, as of June 30, 2021, $28 million of accrued interest is reflected in other current liabilities on our consolidated balance sheet.

Compliance

As of June 30, 2021, we believe we were in compliance with the financial covenants contained in our material debt agreements in all material respects.

Other

For additional information on our long-term debt and credit facilities, see Note 6—Long-Term Debt and Note Payable - Affiliate to our consolidated financial statements in Item 8 of Part II of our Annual Report on Form 10-K for the year ended December 31, 2020.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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+ Details

Fair Value Disclosure

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Disclosure

Our financial instruments consist of cash and cash equivalents, restricted cash, accounts receivable, advances from affiliates, accounts payable, note payable-affiliate and long-term debt, excluding finance lease and other obligations. Due to their short-term nature, the carrying amounts of our cash and cash equivalents, restricted cash, accounts receivable, advances from affiliates, accounts payable and note payable-affiliate approximate their fair values.

The three input levels in the hierarchy of fair value measurements are defined by the Fair Value Measurement and Disclosure framework generally as follows:


Input Level						Description of Input
Level 1						Observable inputs such as quoted market prices in active markets.
Level 2						Inputs other than quoted prices in active markets that are either directly or indirectly observable.
Level 3						Unobservable inputs in which little or no market data exists.

The following table presents the carrying amounts and estimated fair values of our long-term debt, excluding finance lease and other obligations, as well as the input level used to determine the fair values indicated below:


		June 30, 2021			December 31, 2020
	Input Level	Carrying Amount		Fair Value	Carrying Amount	Fair Value
		(Dollars in millions)
Liabilities—Long-term debt (excluding finance lease and other obligations)	2	$	3,102	3,304	3,328	3,532

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Commitments, Contingencies and Other Items	6 Months Ended
Commitments, Contingencies and Other Items	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies and Other Items	Commitments, Contingencies and Other Items We are subject to various claims, legal proceedings and other contingent liabilities, including the matters described below, which individually or in the aggregate could materially affect our financial condition, future results of operations or cash flows. As a matter of course, we are prepared to both litigate these matters to judgment as needed, as well as to evaluate and consider reasonable settlement opportunities. Irrespective of its merits, litigation may be both lengthy and disruptive to our operations and could cause significant expenditure and diversion of management attention. We review our litigation accrual liabilities on a quarterly basis, but in accordance with applicable accounting guidelines only establish accrual liabilities when losses are deemed probable and reasonably estimable and only revise previously-established accrual liabilities when warranted by changes in circumstances, in each case based on then-available information. As such, as of any given date we could have exposure to losses under proceedings as to which no liability has been accrued or as to which the accrued liability is inadequate. Amounts accrued for our litigation and non-income tax contingencies at June 30, 2021 aggregated to approximately $19 million and are included in “Other” current liabilities and “Other Liabilities” in our consolidated balance sheet as of such date. The establishment of an accrual does not mean that actual funds have been set aside to satisfy a given contingency. Thus, the resolution of a particular contingency for the amount accrued could have no effect on our results of operations but nonetheless could have an adverse effect on our cash flows. Principal Proceedings Billing Practices Suits In June 2017, a former employee of a Lumen Technologies subsidiary filed an employment lawsuit against Lumen Technologies (at the time known as CenturyLink, Inc.) claiming that she was wrongfully terminated for alleging that Lumen charged some of its retail customers for products and services they did not authorize. Thereafter, based in part on the allegations made by the former employee, several legal proceedings were filed, including consumer class actions in federal and state courts, a series of securities investor class actions in federal courts, and several shareholder derivative actions in federal and Louisiana state courts. The derivative cases were brought on behalf of CenturyLink, Inc. against certain current and former officers and directors of the Company and seek damages for alleged breaches of fiduciary duties. The consumer class actions, the securities investor class actions, and the federal derivative actions were transferred to the U.S. District Court for the District of Minnesota for coordinated and consolidated pretrial proceedings as In Re: CenturyLink Sales Practices and Securities Litigation. Lumen Technologies has settled the consumer and securities investor class actions. The consumer class settlement was previously approved by the Court and is final. The shareholder class settlement was approved by the Court in July 2021. Approximately 12,000 potential class members elected to opt out of the consumer class settlement, and Lumen Technologies has settled the claims of approximately 11,000 such class members asserted by one law firm subject to certain conditions. The derivative actions remain pending. Lumen has engaged in discussions regarding related claims with a number of state attorneys general, and has entered into agreements settling certain of the consumer practices claims asserted by state attorneys general. While Lumen Technologies does not agree with allegations raised in these matters, it has been willing to consider reasonable settlements where appropriate. Other Proceedings, Disputes and Contingencies From time to time, we are involved in other proceedings incidental to our business, including patent infringement allegations, administrative hearings of state public utility commissions relating primarily to our rates or services, actions relating to employee claims, various tax issues, environmental law issues, grievance hearings before labor regulatory agencies and miscellaneous third-party tort actions. We are currently defending several patent infringement lawsuits asserted against us by non-practicing entities, many of which are seeking substantial recoveries. These cases have progressed to various stages and one or more may go to trial during 2021 if they are not otherwise resolved. Where applicable, we are seeking full or partial indemnification from our vendors and suppliers. As with all litigation, we are vigorously defending these actions and, as a matter of course, are prepared to litigate these matters to judgment, as well as to evaluate and consider all reasonable settlement opportunities. We are subject to various federal, state and local environmental protection and health and safety laws. From time to time, we are subject to judicial and administrative proceedings brought by various governmental authorities under these laws. Several such proceedings are currently pending, but none is reasonably expected to exceed $300,000 in fines and penalties. The outcome of these other proceedings described under this heading is not predictable. However, based on current circumstances, we do not believe that the ultimate resolution of these other proceedings, after considering available defenses and any insurance coverage or indemnification rights, will have a material adverse effect on us. The matters listed above in this Note do not reflect all of our contingencies. For additional information on our contingencies, see Note 16—Commitments, Contingencies and Other Items to the financial statements included in Item 8 of Part II of our Annual Report on Form 10-K for the year ended December 31, 2020. The ultimate outcome of the above-described matters may differ materially from the outcomes anticipated, estimated, projected or implied by us in certain of our statements appearing above in this Note, and proceedings currently viewed as immaterial by us may ultimately materially impact us.

Dividends	6 Months Ended
Dividends	Jun. 30, 2021
Dividends [Abstract]
Dividends	Dividends From time to time we may declare and pay dividends to our direct parent company, QSC, sometimes in excess of our earnings to the extent permitted by applicable law. Our debt covenants do not currently limit the amount of dividends we can pay to QSC. During the six months ended June 30, 2021 and 2020, we declared and paid dividends to QSC of $570 million and $925 million, respectively. Dividends paid are reflected on our consolidated statements of cash flows as financing activities.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

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+ Details

Other Financial Information

6 Months Ended

Jun. 30, 2021

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Other Financial Information

Other Current Assets

The following table presents details of other currents assets in our consolidated balance sheets:


	June 30, 2021		December 31, 2020
	(Dollars in millions)
Prepaid expenses	$	56	40
Contract acquisition costs	45		47
Contract fulfillment costs	30		28
Other	6		7
Total other current assets	$	137	122

Other Noncurrent Liabilities

The following table presents details of other noncurrent liabilities in our consolidated balance sheets:


	June 30, 2021		December 31, 2020
	(Dollars in millions)
Unrecognized tax benefits	$	455	448
Deferred revenue	110		108
Noncurrent operating lease liability	67		76
Other	55		53
Total other noncurrent liabilities	$	687	685

Labor Union Contracts	6 Months Ended
Labor Union Contracts	Jun. 30, 2021
Risks and Uncertainties [Abstract]
Labor Union Contracts	Labor Union Contracts As of June 30, 2021, approximately 44% of our employees were represented by the Communication Workers of America ("CWA") or the International Brotherhood of Electrical Workers ("IBEW"). There are no collective bargaining agreements that are scheduled to expire over the 12 month period ending June 30, 2022. We believe relations with our employees continue to be generally good.

Background (Policies)	6 Months Ended
Background (Policies)	Jun. 30, 2021
Accounting Policies [Abstract]
Basis of presentation	Our consolidated balance sheet as of December 31, 2020, which was derived from our audited consolidated financial statements, and our unaudited interim consolidated financial statements provided herein have been prepared in accordance with the instructions for Form 10-Q. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") have been condensed or omitted pursuant to rules and regulations of the U.S. Securities and Exchange Commission ("SEC"); however, in our opinion, the disclosures made are adequate to make the information presented not misleading. We believe that these consolidated financial statements include all normal recurring adjustments necessary to fairly present the results for the interim periods. The consolidated results of operations and cash flows for the first six months of the year are not necessarily indicative of the consolidated results of operations and cash flows that might be expected for the entire year. These consolidated financial statements and the accompanying notes should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2020. The accompanying consolidated financial statements include our accounts and the accounts of our subsidiaries. Intercompany amounts and transactions with our consolidated subsidiaries have been eliminated. Transactions with our non-consolidated affiliates (referred to herein as affiliates) have not been eliminated.
Reclassification	We reclassified certain prior period amounts to conform to the current period presentation, including our revenue by product and service categories.
Segments	Our operations are integrated into and reported as part of Lumen Technologies. Lumen's chief operating decision maker ("CODM") is our CODM but reviews our financial information on an aggregate basis only in connection with our quarterly and annual reports that we file with the SEC. Consequently, we do not provide our discrete financial information to the CODM on a regular basis.
Recently adopted and issued accounting pronouncements	Debt On January 1, 2021, we adopted ASU 2020-09, "Debt (Topic 470) Amendments to SEC Paragraphs Pursuant to SEC Release No. 33-10762" ("ASU 2020-09"). This ASU amends and supersedes various SEC paragraphs to reflect SEC Release No. 33-10762, which includes amendments to the financial disclosure requirements applicable to registered debt offerings that include credit enhancements, such as subsidiary guarantees. The adoption of ASU 2020-09 did not have an impact to our consolidated financial statements. Investments On January 1, 2021, we adopted ASU 2020-01, "Investments - Equity Securities (Topic 321), Investments - Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) - Clarifying the Interactions between Topic 321, Topic 323, and Topic 815)" ("ASU 2020-01"). This ASU, among other things, clarifies that a company should consider observable transactions that require a company to either apply or discontinue the equity method of accounting under Topic 323, Investments - Equity Method and Joint Ventures, for the purposes of applying the measurement alternative in accordance with Topic 321 immediately before applying or upon discontinuing the equity method. As of June 30, 2021, we determined there was no application or discontinuation of the equity method during the reporting periods. The adoption of ASU 2020-01 did not have an impact to our consolidated financial statements. Income taxes On January 1, 2021, we adopted ASU 2019-12, "Simplifying the Accounting for Income Taxes (Topic 740)" ("ASU 2019-12"). This ASU removes certain exceptions for investments, intra-period allocations and interim calculations, and adds guidance to reduce complexity in accounting for income taxes. The adoption of ASU 2019-12 did not have a material impact to our consolidated financial statements. Measurement of Credit Losses on Financial Instruments We adopted ASU 2016-13, "Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13") on January 1, 2020 and recognized a cumulative adjustment to our accumulated deficit as of the date of adoption of $3 million, net of tax effect of $1 million. Please refer to Note 4—Credit Losses on Financial Instruments for more information. Recently Issued Accounting Pronouncements In March 2020, the FASB issued ASU 2020-04, "Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting" ("ASU 2020-04" or "Reference Rate Reform"), designed to ease the burden of accounting for contract modifications related to the global market-wide reference rate transition period. Subject to certain criteria, ASU 2020-04 provides qualifying entities the option to apply expedients and exceptions to contract modifications and hedging accounting relationships made until December 31, 2022. These amendments are effective immediately and may be applied prospectively to contract modifications made and hedging relationships entered into or evaluated on or before December 31, 2022. ASU 2020-04 provides optional guidance for a limited time to ease the potential burden in accounting for reference rate reform. Based on our review of our key material contracts through June 30, 2021, we do not expect ASU 2020-04 to have any material impact on the consolidated financial statements.
Goodwill and intangible assets, goodwill	We assess our goodwill for impairment annually as of October 31, or, under certain circumstances, more frequently, such as when events or changes in circumstances indicate there may be impairment. We are required to write-down the value of goodwill in periods in which the carrying value of equity exceeds the estimated fair value of equity, limited to the amount of goodwill. Goodwill is evaluated for impairment at the reporting unit level, and we have determined that we have one reporting unit.
Operating lease income	Qwest leases various data transmission capacity, office facilities, switching facilities and other network sites to third parties under operating leases. Lease and sublease revenue are included in operating revenue in our consolidated statements of operations.
Credit losses on financial instruments	In accordance with ASC 326, "Financial Instruments - Credit Losses," we aggregate financial assets with similar risk characteristics to align our expected credit losses with the credit quality or deterioration over the life of such assets. We monitor certain risk characteristics within our aggregated financial assets and revise their composition accordingly, to the extent internal and external risk factors change each reporting period. Financial assets that do not share risk characteristics with other financial assets are evaluated separately. Our financial assets measured at amortized cost primarily consist of accounts receivable. If there is a deterioration of a customer's financial condition or if future default rates in general differ from currently anticipated default rates (including changes caused by COVID-19), we may need to adjust the allowance for credit losses, which would affect earnings in the period that adjustments are made.

Goodwill, Customer Relationships and Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill

Goodwill, customer relationships and other intangible assets consisted of the following:


	June 30, 2021		December 31, 2020
	(Dollars in millions)
Goodwill	$	9,360	9,360
Customer relationships, less accumulated amortization of $5,699 and $5,611	$	—	88
Other intangible assets, less accumulated amortization of $1,842 and $1,831	231		255
Total other intangible assets, net	$	231	343

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

We estimate that total amortization expense for intangible assets for the years ending December 31, 2021 through 2025 will be as follows:


	(Dollars in millions)
2021 (remaining six months)	$	43
2022	85
2023	60
2024	12
2025	10

Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2021

Revenue from Contract with Customer [Abstract]

Schedule of Revenue

The following tables provide our total revenue by product and service category as well as the amount of revenue that is not subject to ASC 606, "Revenue from Contracts with Customers" ("ASC 606"), but is instead governed by other accounting standards:


	Three Months Ended June 30, 2021				Three Months Ended June 30, 2020
	Total Revenue		Adjustments for Non-ASC 606 Revenue (1)	Total Revenue from Contracts with Customers	Total Revenue	Adjustments for Non-ASC 606 Revenue (1)	Total Revenue from Contracts with Customers
	(Dollars in millions)
Voice and other	$	530	(83)	447	569	(87)	482
Fiber Infrastructure	501		(29)	472	509	(33)	476
IP and Data Services	116		—	116	129	—	129
Affiliate Services	577		(6)	571	592	(1)	591
Total revenue	$	1,724	(118)	1,606	1,799	(121)	1,678

____________________________________________________________________

(1)Includes regulatory revenue and lease revenue not within the scope of ASC 606.


	Six Months Ended June 30, 2021				Six Months Ended June 30, 2020
	Total Revenue		Adjustments for Non-ASC 606 Revenue (1)	Total Revenue from Contracts with Customers	Total Revenue	Adjustments for Non-ASC 606 Revenue (1)	Total Revenue from Contracts with Customers
	(Dollars in millions)
Voice and other	$	1,073	(168)	905	1,159	(176)	983
Fiber Infrastructure	1,005		(60)	945	1,022	(64)	958
IP and Data Services	239		—	239	261	—	261
Affiliate Services	1,199		(9)	1190	1,275	(2)	1,273
Total revenue	$	3,516	(237)	3,279	3,717	(242)	3,475

____________________________________________________________________

(1)Includes regulatory revenue and lease revenue not within the scope of ASC 606.

Contract with customer, asset and liability

The following table provides balances of customer receivables, contract assets and contract liabilities as of June 30, 2021 and December 31, 2020:


	June 30, 2021		December 31, 2020
	(Dollars in millions)
Customer receivables (1)	$	304	346
Contract assets	11		13
Contract liabilities	323		300

______________________________________________________________________

(1)Reflects gross customer receivables, including gross affiliate receivables, of $340 million and $396 million, net of allowance for doubtful accounts of $36 million and $50 million, at June 30, 2021 and December 31, 2020, respectively.

Capitalized contract cost

The following tables provide changes in our contract acquisition costs and fulfillment costs:


	Three Months Ended June 30, 2021			Three Months Ended June 30, 2020
	Acquisition Costs		Fulfillment Costs	Acquisition Costs	Fulfillment Costs
	(Dollars in millions)
Beginning of period balance	$	69	52	84	61
Costs incurred	13		6	13	6
Amortization	(14)		(9)	(16)	(8)
End of period balance	$	68	49	81	59


	Six Months Ended June 30, 2021			Six Months Ended June 30, 2020
	Acquisition Costs		Fulfillment Costs	Acquisition Costs	Fulfillment Costs
	(Dollars in millions)
Beginning of period balance	$	73	54	86	64
Costs incurred	24		12	27	12
Amortization	(29)		(17)	(32)	(17)
End of period balance	$	68	49	81	59

Credit Losses on Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2021

Credit Loss [Abstract]

Financing Receivable, Allowance for Credit Loss

The following table presents the activity of our allowance for credit losses by accounts receivable portfolio for the six months ended June 30, 2021:


	Business		Mass Markets	Total
	(Dollars in millions)
Beginning balance at January 1, 2021 (1)	$	25	36	61
Provision for expected losses	5		7	12
Write-offs charged against the allowance	(11)		(27)	(38)
Recoveries collected	1		8	9
Ending balance at June 30, 2021	$	20	24	44

(1) Due to an internal reorganization of our reporting categories on January 1, 2021, our accounts receivable portfolios were changed to align with changes to how we manage our customers. Allowance for credit losses previously included in the Consumer and Business portfolio of $32 million and $4 million, respectively, were reclassified to the Mass Markets allowance for credit losses on January 1, 2021, as a result of this change.

Long-Term Debt and Note Payable - Affiliate (Tables)

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Schedule of long-term debt

The following chart reflects (i) the consolidated long-term debt of Qwest Corporation and its subsidiaries, including finance lease and other obligations, unamortized premiums, net, unamortized debt issuance costs and (ii) note payable - affiliate:


	Interest Rates (1)	Maturities (1)	June 30, 2021		December 31, 2020
			(Dollars in millions)
Senior notes	6.500% - 7.750%	2021 - 2057	$	2,935	3,170
Term loan (2) (3)	LIBOR + 2.00%	2027	215		215
Finance lease and other obligations	Various	Various	3		6
Unamortized premiums, net			5		5
Unamortized debt issuance costs			(53)		(62)
Total long-term debt			3,105		3,334
Less current maturities			(949)		(948)
Long-term debt, excluding current maturities			$	2,156	2,386
Note payable - affiliate	4.883%	2022	$	1,158	1,130

_______________________________________________________________________________

(1)As of June 30, 2021.

(2)Qwest Corporation's Term Loan had interest rates of 2.110% as of June 30, 2021 and 2.150% as of December 31, 2020.

(3)See Note 1— Background for our considerations of the impact of Reference Rate Reform on our debt subject to rate reference changes from LIBOR.

Schedule of maturities of long-term debt

Set forth below is the aggregate principal amount of our long-term debt as of June 30, 2021 (excluding unamortized premiums, net and unamortized debt issuance costs and note payable-affiliate) maturing during the following years:


	(Dollars in millions)
2021 (remaining six months)	$	951
2022	1
2023	—
2024	—
2025	250
2026 and thereafter	1,951
Total long-term debt	$	3,153

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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+ Details

Fair Value Disclosure (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of carrying amounts and estimated fair values of long-term debt, excluding capital lease obligations, and input level to determine fair values

The following table presents the carrying amounts and estimated fair values of our long-term debt, excluding finance lease and other obligations, as well as the input level used to determine the fair values indicated below:


		June 30, 2021			December 31, 2020
	Input Level	Carrying Amount		Fair Value	Carrying Amount	Fair Value
		(Dollars in millions)
Liabilities—Long-term debt (excluding finance lease and other obligations)	2	$	3,102	3,304	3,328	3,532

Other Financial Information (Tables)

6 Months Ended

Jun. 30, 2021

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of components other current assets

The following table presents details of other currents assets in our consolidated balance sheets:


	June 30, 2021		December 31, 2020
	(Dollars in millions)
Prepaid expenses	$	56	40
Contract acquisition costs	45		47
Contract fulfillment costs	30		28
Other	6		7
Total other current assets	$	137	122

Other Noncurrent Liabilities

The following table presents details of other noncurrent liabilities in our consolidated balance sheets:


	June 30, 2021		December 31, 2020
	(Dollars in millions)
Unrecognized tax benefits	$	455	448
Deferred revenue	110		108
Noncurrent operating lease liability	67		76
Other	55		53
Total other noncurrent liabilities	$	687	685

Accounting Policies - General (Details)	Jun. 30, 2021 state
Accounting Policies [Abstract]
Number of states in which entity operates	14

Accounting Policies- Segments (Details)	6 Months Ended
Accounting Policies- Segments (Details)	Jun. 30, 2021 segment
Accounting Policies [Abstract]
Number of reportable segments	1

Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Cumulative effect of new accounting principle in period of adoption, net of tax	$ 10,519		$ 10,098	$ 10,123
RETAINED EARNINGS
Accounting Policies [Abstract]
Cumulative effect of new accounting principle in period of adoption, net of tax	$ 469	$ 230	$ 48	$ 73	$ 68	$ 67
Cumulative Effect Of New Accounting Principle In Period Of Adoption, Tax						(1)
Cumulative Effect, Period of Adoption, Adjustment \| RETAINED EARNINGS
Accounting Policies [Abstract]
Cumulative effect of new accounting principle in period of adoption, net of tax						$ 3

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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+ Details

Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 9,360	$ 9,360
Finite-lived intangible assets, net	231	343
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	0	88
Accumulated amortization	5,699	5,611
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, net	231	255
Accumulated amortization	$ 1,842	$ 1,831

Goodwill, Customer Relationships and Other Intangible Assets - Additional Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) reporting_unit	Jun. 30, 2020 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Number of reporting units \| reporting_unit			1
Intangible assets, gross (including goodwill)	$ 17,100		$ 17,100
Amortization of intangible assets	$ 22	$ 121	$ 132	$ 245

Goodwill, Customer Relationships and Other Intangible Assets - Schedule of Future Amortization Expense (Details) $ in Millions	Jun. 30, 2021 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2021 (remaining six months)	$ 43
2022	85
2023	60
2024	12
2025	$ 10

Revenue Recognition - Additional Information - Overview (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) category	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Revenue from Contract with Customer [Abstract]
Number of categories of products and services \| category	4
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 1,724	$ 1,799	$ 3,516	$ 3,717
Voice and Other - CAF Phase II [Member]
Disaggregation of Revenue [Line Items]
Total operating revenues			$ 73

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details

Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total Revenue	$ 1,724	$ 1,799	$ 3,516	$ 3,717
Adjustments for non-ASC 606 revenue	(118)	(121)	(237)	(242)
Total Revenue from Contracts with Customers	$ 1,606	$ 1,678	$ 3,279	$ 3,475
Percent of operating revenue	5.00%	4.00%	4.00%	4.00%
Voice and Other [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	$ 530	$ 569	$ 1,073	$ 1,159
Adjustments for non-ASC 606 revenue	(83)	(87)	(168)	(176)
Total Revenue from Contracts with Customers	447	482	905	983
Fiber Infrastructure [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	501	509	1,005	1,022
Adjustments for non-ASC 606 revenue	(29)	(33)	(60)	(64)
Total Revenue from Contracts with Customers	472	476	945	958
IP & Data Services [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	116	129	239	261
Adjustments for non-ASC 606 revenue	0	0	0	0
Total Revenue from Contracts with Customers	116	129	239	261
Affiliate Services [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	577	592	1,199	1,275
Adjustments for non-ASC 606 revenue	(6)	(1)	(9)	(2)
Total Revenue from Contracts with Customers	$ 571	$ 591	$ 1,190	$ 1,273

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details

Revenue Recognition - Operating Lease Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue from Contract with Customer [Abstract]
Lease income	$ 78	$ 78	$ 157	$ 157
Percent of operating revenue	5.00%	4.00%	4.00%	4.00%

Revenue Recognition - Customer Receivables and Contract Balances (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Customer receivables	$ 304	$ 346
Contract assets	11	13
Contract liabilities	323	300
Accounts receivable, gross	340	396
Allowance for doubtful accounts	$ 36	$ 50

Revenue Recognition - Additional Information - Customer Receivables and Contract Balances (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Customer Receivables and Contract Balances [Line Items]
Revenue recognized from prior year contract liability	$ 12	$ 13	$ 175	$ 197
Minimum
Customer Receivables and Contract Balances [Line Items]
Contract term			1 year
Maximum
Customer Receivables and Contract Balances [Line Items]
Contract term			5 years

Revenue Recognition - Additional Information, Performance Obligation (Details) $ in Millions	Jun. 30, 2021 USD ($)
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 204
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	90.00%
Expected timing of satisfaction, period	2 years 6 months

Revenue Recognition - Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Acquisition Costs
Capitalized Contract Cost
Beginning of period balance	$ 69	$ 84	$ 73	$ 86
Costs incurred	13	13	24	27
Amortization	(14)	(16)	(29)	(32)
End of period balance	68	81	68	81
Fulfillment Costs
Capitalized Contract Cost
Beginning of period balance	52	61	54	64
Costs incurred	6	6	12	12
Amortization	(9)	(8)	(17)	(17)
End of period balance	$ 49	$ 59	$ 49	$ 59

Revenue Recognition - Additional Information - Contract Costs (Details) - Weighted Average	6 Months Ended
	Jun. 30, 2021
Mass Markets Customers, Average Contract Life
Contract Costs [Line Items]
Length of customer life	30 months
Business Customer, Average Contract Life
Contract Costs [Line Items]
Length of customer life	29 months

Credit Losses on Financial Instruments (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 61
Provision for expected losses	12
Write-offs charged against the allowance	(38)
Recoveries collected	9
Ending balance	44
Consumer Reclassed to Mass Market
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	32
Business Reclassed to Mass Markets
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4
Mass Market Portfolio
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	36
Provision for expected losses	7
Write-offs charged against the allowance	(27)
Recoveries collected	8
Ending balance	24
Business Portfolio
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	25
Provision for expected losses	5
Write-offs charged against the allowance	(11)
Recoveries collected	1
Ending balance	$ 20

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References + Details

Long-Term Debt and Note Payable - Affiliate - Schedule of Long Term Debt (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Long-term debt
Long-term debt, gross	$ 3,153
Unamortized premiums, net	5	$ 5
Unamortized debt issuance costs	(53)	(62)
Less current maturities	(949)	(948)
Long-term debt, excluding current maturities	2,156	2,386
Note payable - affiliate	1,158	1,130
Long-term Debt and Lease Obligation, Including Current Maturities, Total	3,105	3,334
Senior notes
Long-term debt
Long-term debt, gross	$ 2,935	3,170
Senior notes \| Minimum
Long-term debt
Stated interest rate	6.50%
Senior notes \| Maximum
Long-term debt
Stated interest rate	7.75%
Term loan
Long-term debt
Long-term debt, gross	$ 215	$ 215
Weighted average interest rate	2.11%	2.15%
Term loan \| London Interbank Offered Rate (LIBOR)
Long-term debt
Basis spread on variable rate	2.00%
Finance lease and other obligations
Long-term debt
Long-term debt, gross	$ 3	$ 6
Note payable - affiliate \| Affiliated entity
Long-term debt
Note payable - affiliate	$ 1,158	$ 1,130
Weighted average interest rate	4.883%

Long-Term Debt and Note Payable - Affiliate - Schedule of Debt Maturity (Details) $ in Millions	Jun. 30, 2021 USD ($)
Debt Disclosure [Abstract]
2021 (remaining six months)	$ 951
2022	1
2023	0
2024	0
2025	250
2026 and thereafter	1,951
Total long-term debt	$ 3,153

Long-Term Debt and Note Payable - Affiliate - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Feb. 16, 2021	Dec. 31, 2020	Sep. 30, 2017
Long-term debt
Net loss on early retirement of debt	$ 8,000,000	$ 19,000,000
Note payable - affiliate	1,158,000,000			$ 1,130,000,000
Senior notes
Long-term debt
Net loss on early retirement of debt	8,000,000
Note payable - affiliate \| Affiliated entity
Long-term debt
Note payable - affiliate	1,158,000,000			$ 1,130,000,000
Note payable - affiliate \| Affiliated entity \| Qwest Corporation
Long-term debt
Note payable - affiliate funding commitment					$ 965,000,000
Note payable - affiliate	1,200,000,000
Accrued interest on note payable - affiliate	$ 28,000,000
7.000% Notes Due 2056 \| Senior notes
Long-term debt
Repurchased face amount			$ 235,000,000
Stated interest rate			7.00%

Fair Value Disclosure (Details) - Fair value measurements, nonrecurring - Fair value inputs, Level 2 - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Carrying Amount
Liabilities
Liabilities—Long-term debt (excluding finance lease and other obligations)	$ 3,102	$ 3,328
Fair Value
Liabilities
Liabilities—Long-term debt (excluding finance lease and other obligations)	$ 3,304	$ 3,532

Commitments, Contingencies and Other Items (Details) plaintiff in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($) patent	Jun. 30, 2021 USD ($) plaintiff
Loss Contingencies [Line Items]
Estimate of possible loss \| $	$ 19,000,000	$ 19,000,000
Loss Contingency, Patents Allegedly Infringed, Number \| patent	1
Unfavorable Regulatory Action
Loss Contingencies [Line Items]
Estimate of possible loss \| $	$ 300,000	$ 300,000
Minnesota Consumer Class Actions \| U.S. District Court for the District of Minnesota
Loss Contingencies [Line Items]
Loss Contingency, Number Of Plaintiffs Elected To Opt Out \| plaintiff		12
Number of potential class members \| plaintiff		11

Dividends (Details) - USD ($) $ in Millions	6 Months Ended
Dividends (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Dividends [Abstract]
Dividends declared and paid to Qwest Services Corporation	$ 570	$ 925

Other Financial Information- Other Current Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid expenses	$ 56	$ 40
Contract acquisition costs	45	47
Contract fulfillment costs	30	28
Other	6	7
Total other current assets	$ 137	$ 122

Other Financial Information - Other Non-current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Deferred Credits and Other Liabilities [Abstract]
Unrecognized tax benefits	$ 455	$ 448
Deferred revenue	110	108
Noncurrent operating lease liability	67	76
Other	55	53
Total other noncurrent liabilities	$ 687	$ 685

Labor Union Contracts (Details)	6 Months Ended
Labor Union Contracts (Details)	Jun. 30, 2021
Union employees concentration risk \| Employees covered under collective bargaining agreements
Labor Union Contracts
Concentration risk percentage	44.00%

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]

- Definition

Indicates amendment to accounting standards.

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+ Details