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Alkira, Inc. [Member] Alkira, Inc. 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Qwest Corporation's 6.750% Senior Notes due 2052, denominations of $25 Guarantees of Qwest Corporation's 6.750% Senior Notes Due 2052, Denominations of $25 [Member] Guarantees of Qwest Corporation's 6.750% Senior Notes Due 2052, Denominations of $25 Adjustments to reconcile net loss to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Second Lien Notes Second Lien Notes Maturing 2029-2031 [Member] Second Lien Notes Maturing 2029-2031 Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Total Revenue from Contracts with Customers Revenue from Contract with Customer, Excluding Assessed Tax FINANCING ACTIVITIES Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Interest cost Defined Benefit Plan, Interest Cost Schedule of Changes in Accrued Liabilities for Severance Expenses Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Assets held 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Segment Reporting [Table] Public Sector Public Sector [Member] Public Sector Schedule of Maturities of Long-Term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] 6.500% Notes due 2051 6.500% Notes Due 2051 [Member] 6.500% Notes Due 2051 Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Customer receivables, net of allowance Contract with Customer, Receivable, after Allowance for Credit Loss Other current assets, net Total other current assets, net Other Assets, Current Long-term debt, weighted average interest rate Long-Term Debt, Weighted Average Interest Rate, at Point in Time Mass Market Mass Market Segment [Member] Mass Market Segment Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Level 3 Financing, Inc. Level 3 Financing, Inc. [Member] An subsidiary of CenturyLink, Inc. OPERATING (LOSS) INCOME Operating Income (Loss) Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date Net loss (gain) on sale of business Net gain on sale of business Gain (Loss) on Disposition of Business Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Restructuring reserve Restructuring Reserve [Roll Forward] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service cost Defined Benefit Plan, Service Cost 4.250% Senior Notes due 2028 4.250% Senior Notes Due 2028 [Member] 4.250% Senior Notes Due 2028 Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Change in net prior service cost, tax Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax Cancellation of term loans as part of refinancings (Note 5) Cancellation Of Debt Cancellation Of Debt Facility Maintained By a Subsidiary Facility Maintained By A Subsidiary [Member] Facility Maintained By A Subsidiary Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Beginning of period balance End of period balance Capitalized Contract Cost, Net Income taxes refunded (paid), net Income Tax Paid, after Refund Received Disaggregation of 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Other International And Other [Member] International And Other Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Net proceeds from issuance of long-term debt Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number Contract liabilities Contract with Customer, Liability, Noncurrent Post-Retirement Benefit Plan Post-Retirement Benefit Plans Other Postretirement Benefits Plan [Member] Other Financial Information Additional Financial Information Disclosure [Text Block] Contract costs Capitalized Contract Cost, Net, Current Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Background Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Term Loan B-3 Term Loan B-3 [Member] Term Loan B-3 7.500% Senior Notes due 2037 7.500% Senior Notes Due 2037 [Member] 7.500% Senior Notes Due 2037 LOSS BEFORE INCOME TAXES Total before tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] COMMITMENTS AND CONTINGENCIES (Note 11) Commitments and Contingencies Gross Carrying Amount Intangible Asset, Finite-Lived, before Accumulated Amortization OPERATING REVENUE Total Revenue Revenues Revenues Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Finance lease and other obligations Finance Lease And Other Obligations Finance Lease And Other Obligations Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Contract term Revenue From Contract With Customer, Contract Term Revenue from Contract with Customer, Contract Term Number of revenue sales channel Number Of Revenue Sales Channel Number Of Revenue Sales Channel Capitalized Contract Cost [Line Items] Capitalized Contract Cost [Line Items] LIABILITIES AND STOCKHOLDERS' DEFICIT Liabilities and Equity [Abstract] OPERATING EXPENSES Operating expenses Operating Costs and Expenses [Abstract] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Fully Amortized and Retired Capitalized Software Fully Amortized And Retired Capitalized Software [Member] Fully Amortized And Retired Capitalized Software All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] PEO Name PEO Name Mass Markets Fiber-to-the Home Business Mass Markets Fiber-To-The Home Business [Member] Mass Markets Fiber-To-The Home Business Contract liabilities Contract with Customer, Liability Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Prepayment from net cash proceeds of certain asset sales (as a percent) Debt Instrument, Prepayment From Net Cash Proceeds Of Certain Asset Sales, Percentage Debt Instrument, Prepayment From Net Cash Proceeds Of Certain Asset Sales, Percentage Legal Entity [Axis] Legal Entity [Axis] Payments, net Payments for Restructuring Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Total Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Contractual credits and commercial agreements liabilities Disposal Group, Including Discontinued Operation, Liabilities, Contractual Credits And Commercial Agreements Disposal Group, Including Discontinued Operation, Liabilities, Contractual Credits And Commercial Agreements Accounts payable Increase (Decrease) in Accounts Payable Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Base Rate Base Rate [Member] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss by Component Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Adjusted EBITDA Adjusted EBITDA Income (Loss) From Continuing Operations Before Interest Income, Tax, Depreciation, And Amortization Income (Loss) From Continuing Operations Before Interest Income, Tax, Depreciation, And Amortization Preferred Stock Purchase Rights Preferred Stock Purchase Rights [Member] Preferred Stock Purchase Rights Debt Instrument [Axis] Debt Instrument [Axis] Cash consideration Payments to Acquire Businesses, Gross Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Non-headcount costs Non-Headcount Costs Non-Headcount Costs Contractual credits Disposal Group, Including Discontinued Operation, Liabilities, Contractual Credits Disposal Group, Including Discontinued Operation, Liabilities, Contractual Credits Capitalized interest Interest Paid, Capitalized, Investing Activity Disposal Group Name [Axis] Disposal Group Name [Axis] Customer [Domain] Customer [Domain] 2029 Long-Term Debt And Lease Obligation, Maturity, Year Three Long-Term Debt And Lease Obligation, Maturity, Year Three Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] BASIC (in dollars per share) Basic loss per common share (in dollars per share) Earnings Per Share, Basic Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type Award Type [Axis] First Lien Notes Due 2034 First Lien Notes Due 2034 [Member] First Lien Notes Due 2034 Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net of allowance of $45 and $67 Accounts Receivable, after Allowance for Credit Loss, Current Accumulated deficit Retained Earnings (Accumulated Deficit) Number of indentures Debt Instrument, Number Of Indentures Debt Instrument, Number Of Indentures Change in contract costs held for sale Capitalized Contract Cost, Change In Contract Costs Held For Sale Capitalized Contract Cost, Change In Contract Costs Held For Sale Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Product and Service [Axis] Product and Service [Axis] Restricted cash included in Other assets, net Restricted Cash, Noncurrent Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Change in net prior service cost, net of tax of $—, $1, $2 and $1 Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Combined Pension Plan Pension Plans Pension Plan [Member] Length of customer life Revenue From Contract With Customer, Length Of Customer Life Revenue from Contract with Customer, Length of Customer Life Common Stock COMMON STOCK Common Stock [Member] Pre-tax gain on the disposal Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Fair Value Measurement [Domain] Fair Value Measurement [Domain] Schedule of Operating Lease Revenue Operating Lease, Lease Income [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Severance Employee Severance [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Line of Credit and Term Loan Line Of Credit And Medium-Term Notes [Member] Line Of Credit And Medium-Term Notes Concentration risk (as a percent) Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Deferred revenue Deferred Revenue, Noncurrent Equity Awards Adjustments Equity Awards Adjustments [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Commercial agreements Disposal Group, Including Discontinued Operation, Liabilities, Commercial Agreements Disposal Group, Including Discontinued Operation, Liabilities, Commercial Agreements TOTAL LIABILITIES AND STOCKHOLDERS' DEFICIT Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Debt instrument, floor interest rate (as a percent) Debt Instrument, Floor Interest Rate Debt Instrument, Floor Interest Rate Fair value disclosure Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Accrued to expense Restructuring Charges Preferred Stock - No Trading Symbol No Trading Symbol Flag Tabular List, Table Tabular List [Table Text Block] Other Current Assets [Table] Other Current Assets [Table] Other Current Assets [Table] IRU term Indefeasible Right to Use (IRU), Contract Term Indefeasible Right to Use (IRU), Contract Term Other income, net Other income, net Other Nonoperating Income (Expense) Number of debt instruments issued Debt Instrument, Number Of Instruments Debt Instrument, Number Of Instruments Income tax receivable Income Taxes Receivable, Current Shares issuable under convertible securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Name Awards Close in Time to MNPI Disclosures, Individual Name Foreign currency translation adjustment, tax Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] OTHER ASSETS Assets, Noncurrent [Abstract] Business Customers Business Customer [Member] Business Customer [Member] Debt issuance and extinguishment costs and related fees Payments Of Debt Issuance And Extinguishment Costs And Related Fees Payments Of Debt Issuance And Extinguishment Costs And Related Fees Preferred stock-non-redeemable, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock—non-redeemable, $25.00 par value, authorized 2,000 and 2,000 shares, issued and outstanding 7 and 7 shares Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Superpriority Revolving/Term A Credit Agreement Superpriority Revolving/Term A Credit Agreement [Member] Superpriority Revolving/Term A Credit Agreement Class of Stock [Domain] Class of Stock [Domain] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Interest paid (net of capitalized interest of $83 and $72) Interest Paid, Excluding Capitalized Interest, Operating Activity Capital expenditures Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Prepayment from net cash proceeds of certain debt issuances (as a percent) Debt Instrument, Prepayment From Net Cash Proceeds Of Certain Debt Issuances, Percentage Debt Instrument, Prepayment From Net Cash Proceeds Of Certain Debt Issuances, Percentage Credit Facility [Axis] Credit Facility [Axis] Severance Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount LONG-TERM DEBT Long-term debt, excluding current maturities Long-Term Debt and Lease Obligation Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Name Measure Name DEFERRED CREDITS AND OTHER LIABILITIES Deferred Revenue, Noncurrent [Abstract] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Long-term Debt and Credit Facilities Debt Instrument [Line Items] Total Number of Employees Number of Employees, Total [Member] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Entity Filer Category Entity Filer Category Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Goodwill impairment Goodwill, Impairment Loss Other Current Assets [Line Items] Other Current Assets [Line Items] [Line Items] for Other Current Assets [Table] Debt modification expense Debt Modification Expense Debt Modification Expense Adjustments for Non-ASC 606 Revenue Revenue Not from Contract with Customer Name Trading Arrangement, Individual Name Contract assets Other Deferred Costs, Net Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Items related to employee benefit plans: Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent [Abstract] Regulatory cost liability related to the sale of the Mass Markets Fiber-to-the-Home business Regulatory Liabilities, Fair Value Disclosure Regulatory Liabilities, Fair Value Disclosure Non-vested restricted stock (in shares) Weighted Average Number of Shares, Restricted Stock Prepaid Expenses and Other Current Assets [Abstract] Prepaid Expense and Other Assets, Current [Abstract] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization SOFR Secured Overnight Financing Rate (SOFR) [Member] Qwest Capital Funding, Inc. Qwest Capital Funding Inc [Member] Represents details pertaining to Qwest Capital Funding, Inc., a wholly owned subsidiary of Qwest Communications International. Inc.. Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] CURRENT ASSETS Assets, Current [Abstract] Other Broadband Other Broadband [Member] Other Broadband Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Uncommitted Letter of Credit Facility Uncommitted Letter of Credit Facility [Member] Uncommitted Letter of Credit Facility [Member] Income tax (benefit) expense Income Tax Expense (Benefit) Reportable Segment Reportable Segment [Member] Reportable Segment Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] 4.000% Senior Notes due 2031 4.000% Senior Notes due 2031 [Member] 4.000% Senior Notes due 2031 Qwest Corporation Qwest Corporation [Member] Represents Qwest Corporation, a wholly-owned subsidiary of Qwest Communications International Inc. Cost of services and products (exclusive of depreciation and amortization) Cost of services and products related to network expenses Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Basis of Presentation Consolidation, Policy [Policy Text Block] Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation 2027 Long-Term Debt And Lease Obligation, Maturity, Year One Long-Term Debt And Lease Obligation, Maturity, Year One Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Recognition of actuarial gain (loss) Defined Benefit Plan, Amortization of Gain (Loss) AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] NET LOSS NET LOSS Net loss Net of tax Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Superpriority Term Loan A Superpriority Term Loan A [Member] Superpriority Term Loan A Goodwill Disposal Group, Including Discontinued Operation, Goodwill Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] 3.875% Second Lien Notes due 2030 3.875% Second Lien Notes Due 2030 [Member] 3.875% Second Lien Notes Due 2030 Fiber Broadband Fiber Broadband [Member] Fiber Broadband Schedule of the Entity's Accumulated Other Comprehensive Loss by Component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Litigation settlement amount Litigation Settlement, Amount Awarded to Other Party Fulfillment Costs Contract Fulfillment Costs [Member] Contract Fulfillment Costs [Member] Senior Notes Maturing 2030-2057 Senior Notes, Maturing 2030-2057 [Member] Senior Notes, Maturing 2030-2057 Schedule of Contract with Customer, Asset and Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Federal Funds Rate Fed Funds Effective Rate Overnight Index Swap Rate [Member] Number of lawsuits filed Loss Contingency, New Claims Filed, Number Marshall Fire Litigation Marshall Fire Litigation [Member] Marshall Fire Litigation Other liabilities Disposal Group, Including Discontinued Operation, Other Liabilities Other current assets and liabilities, net Increase (Decrease) in Other Current Assets and Liabilities, Net Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Loss (numerator) Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]