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Alkira, Inc. [Member] Alkira, Inc. 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Amount Payment for acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Net gain (loss) on early retirement of debt (Note 5) Net loss on early retirement of debt Gain (Loss) on Extinguishment of Debt Fair Value as of Grant Date Award Grant Date Fair Value Patents and other Patents And Other [Member] Patents And Other Redemption price (as a percent) Debt Instrument, Redemption Price, Percentage Number of patents allegedly infringed Loss Contingency, Patents Allegedly Infringed, Number Goodwill [Table] Goodwill [Table] Other Other Assets, Miscellaneous, Current First Lien notes First Lien Notes [Member] First Lien Notes 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 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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 Contract liabilities Contract with Customer, Liability 10.000% Secured Notes due 2032 10.000% Secured Notes Due 2032 [Member] 10.000% Secured Notes Due 2032 Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Guarantees of 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 Payments, net Payments for Restructuring Schedule of Identified Intangible Assets Business Combination, Intangible Asset, Acquired, Finite-Lived and 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Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Level 3 Collateral Guarantors Level 3 Collateral Guarantors [Member] Level 3 Collateral Guarantors 2031 and thereafter Long-Term Debt And Lease Obligation, Maturity, Year Five And Thereafter Long-Term Debt And Lease Obligation, Maturity, Year Five And Thereafter Debt Instrument [Axis] Debt Instrument [Axis] Second Lien Notes Second Lien Notes Maturing 2029-2031 [Member] Second Lien Notes Maturing 2029-2031 Other liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Cash consideration Payments to Acquire Businesses, Gross Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Capitalized interest Interest Paid, Capitalized, Investing Activity Disposal Group Name [Axis] Disposal Group Name [Axis] Customer [Domain] Customer [Domain] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] BASIC (in dollars per share) Basic loss per common share (in 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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, $1, $3 and $2 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] 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] Concentration risk (as a percent) Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Deferred revenue Deferred Revenue, Noncurrent Fiber Broadband Fiber Broadband [Member] Fiber Broadband 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] TOTAL LIABILITIES AND STOCKHOLDERS' DEFICIT Liabilities and Equity Intangible assets including goodwill Intangible Asset, Including Goodwill, after Accumulated Amortization Employee Stock Option Share-Based Payment Arrangement, Option [Member] 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 Tabular List, Table Tabular List [Table Text Block] Other income, net Other income, net Other Nonoperating Income (Expense) 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] GOODWILL AND OTHER ASSETS Assets, Noncurrent [Abstract] Preferred stock-non-redeemable, shares authorized (in shares) Preferred Stock, Shares Authorized 4.000% Second Lien Notes due 2031 4.000% Second Lien Notes Due 2031 [Member] 4.000% Second Lien Notes Due 2031 Acquisition Costs Contract Acquisition Costs [Member] Incremental costs incurred in obtaining a contract with a customer, which are recognized (i.e., amortized) over the term of the initial contract and anticipated renewal contracts to which the costs relate. 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 Incentive compensation plans or convertible securities Share-Based Payment Arrangement Or Convertible Securities [Member] Share-Based Payment Arrangement Or Convertible Securities Adjustment to Compensation: Adjustment to Compensation [Axis] 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 $137 and $110) Interest Paid, Excluding Capitalized Interest, Operating Activity Capital expenditures Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] 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 4.125% Superpriority Senior Secured Notes Due 2030 4.125% Superpriority Senior Secured Notes Due 2030 [Member] 4.125% Superpriority Senior Secured Notes Due 2030 Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Goodwill impairment Goodwill impairment Goodwill, Impairment Loss 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] 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 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 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 SOFR Secured Overnight Financing Rate (SOFR) [Member] Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Facility Maintained By a Subsidiary Facility Maintained By A Subsidiary [Member] Facility Maintained By A Subsidiary Term Loan B-2 Term Loan B-2 [Member] Term Loan B-2 Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] CURRENT ASSETS Assets, Current [Abstract] Superpriority Term Loan B-1 Superpriority Term Loan B-1 [Member] Superpriority Term Loan B-1 Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Statutory Damages Statutory Damages [Member] Statutory Damages Business Business Segment [Member] Business Segment Income tax (benefit) expense Income tax (benefit) expense Income Tax Expense (Benefit) Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Level 3 Financing, Inc. Level 3 Financing, Inc. [Member] An subsidiary of CenturyLink, 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 (decrease) increase 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 Superpriority Revolving/Term A Credit Agreement Superpriority Revolving/Term A Credit Agreement [Member] Superpriority Revolving/Term A Credit Agreement 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] Other Broadband Other Broadband [Member] Other Broadband 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] Goodwill Disposal Group, Including Discontinued Operation, Goodwill Statement [Table] Statement [Table] Senior Notes Maturing 2028-2042 Senior Notes Maturing 2028-2042 [Member] Senior Notes Maturing 2028-2042 Restatement Determination Date: Restatement Determination Date [Axis] Senior Notes Maturing 2028-2037 Senior Notes Maturing 2028-2037 [Member] Senior Notes Maturing 2028-2037 Schedule of the Entity's Accumulated Other Comprehensive Loss by Component Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Fulfillment Costs Contract Fulfillment Costs [Member] Contract Fulfillment Costs [Member] Litigation settlement amount Litigation Settlement, Amount Awarded to Other Party 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] Term Loan B-3 Term Loan B-3 [Member] Term Loan B-3 Other liabilities Disposal Group, Including Discontinued Operation, Other Liabilities Superpriority Term Loan B-2 Superpriority Term Loan B-2 [Member] Superpriority Term Loan B-2 6.750% Notes due 2057 6.750% Notes Due 2057 [Member] 6.750% Notes Due 2057 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] Cancellation of term loans as part of refinancings (Note 5) Cancellation Of Debt Cancellation Of Debt