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Long-Term Debt and Revolving Promissory Note Long-Term Debt and Revolving Promissory Note (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 29, 2014
May 23, 2013
Oct. 02, 2014
Jun. 17, 2013
Feb. 20, 2015
Oct. 01, 2014
Amount of gross interest expense, net of capitalized interest and interest expense ( income) -affiliates                  
Gross interest expense $ 481us-gaap_InterestCostsIncurred $ 467us-gaap_InterestCostsIncurred $ 461us-gaap_InterestCostsIncurred            
Capitalized interest (17)us-gaap_InterestCostsCapitalized (17)us-gaap_InterestCostsCapitalized (18)us-gaap_InterestCostsCapitalized            
Total interest expense 464us-gaap_InterestExpense 450us-gaap_InterestExpense 443us-gaap_InterestExpense            
Interest expense-affiliates, net 40us-gaap_InterestExpenseRelatedParty 64us-gaap_InterestExpenseRelatedParty 24us-gaap_InterestExpenseRelatedParty            
Qwest Corporation | Senior notes | Notes, 6.875 percent due 2054 [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount       500us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ctq_Notes6.875percentdue2054Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
         
Interest rate, stated percentage (as a percent)       6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ctq_Notes6.875percentdue2054Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
         
Net proceeds from issuance of debt       483us-gaap_ProceedsFromDebtNetOfIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= ctq_Notes6.875percentdue2054Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
         
Qwest Corporation | Senior notes | Notes, 6.875 percent due 2054 [Member] | Debt Instrument, Redemption, Period One [Member]                  
Debt Instrument [Line Items]                  
Redemption price of debt instrument (as a percent)       100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= ctq_Notes6.875percentdue2054Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
         
Qwest Corporation | Senior notes | 6.125% Notes due 2053                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount         775us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ctq_Notes6.125PercentDue2053Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Interest rate, stated percentage (as a percent)         6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ctq_Notes6.125PercentDue2053Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Net proceeds from issuance of debt         752us-gaap_ProceedsFromDebtNetOfIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= ctq_Notes6.125PercentDue2053Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Debt instrument face amount of debt sold pursuant to over allotment option granted to underwriters         25ctq_DebtInstrumentFaceAmountOfDebtSoldPursuantToOverAllotmentOptionGrantedToUnderwriters
/ us-gaap_DebtInstrumentAxis
= ctq_Notes6.125PercentDue2053Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Qwest Corporation | Senior notes | 6.125% Notes due 2053 | Debt Instrument, Redemption, Period One [Member]                  
Debt Instrument [Line Items]                  
Redemption price of debt instrument (as a percent)         100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= ctq_Notes6.125PercentDue2053Member
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Qwest Corporation | Senior notes | 7.500 percent Notes due 2014                  
Debt Instrument [Line Items]                  
Interest rate, stated percentage (as a percent)                 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ctq_Notes7.500percentdue2014Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Repayments of long-term debt           600us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= ctq_Notes7.500percentdue2014Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Qwest Corporation | Senior notes | Notes bearing floating interest rates due 2013                  
Debt Instrument [Line Items]                  
Repayments of long-term debt             750us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= ctq_NotesBearingFloatingInterestRateDue2013Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
   
Subsequent Event [Member] | Qwest Corporation | Term Loan                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount               100us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= ctq_TermLoanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Proceeds from term loan               $ 100us-gaap_ProceedsFromIssuanceOfDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= ctq_TermLoanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember