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Long-Term Debt and Revolving Promissory Note Long-Term Debt and Revolving Promissory Note (Details 2) (USD $)
0 Months Ended
Feb. 20, 2015
Mar. 31, 2015
Dec. 31, 2014
Medium-term notes      
Long-term debt      
Long-term debt, gross   $ 100,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
$ 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
Qwest Corporation | Medium-term notes | Term loan      
Long-term debt      
Debt Instrument, Face Amount 100,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ctq_TermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
   
Long-term debt, gross   100,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= ctq_TermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
 
Minimum | Qwest Corporation | Medium-term notes | Term loan | London Interbank Offered Rate (LIBOR)      
Long-term debt      
Basis spread on variable rate (as a percent) 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= ctq_TermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Minimum | Qwest Corporation | Medium-term notes | Term loan | Base Rate      
Long-term debt      
Basis spread on variable rate (as a percent) 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= ctq_TermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
   
Maximum | Qwest Corporation | Medium-term notes | Term loan | London Interbank Offered Rate (LIBOR)      
Long-term debt      
Basis spread on variable rate (as a percent) 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= ctq_TermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Maximum | Qwest Corporation | Medium-term notes | Term loan | Base Rate      
Long-term debt      
Basis spread on variable rate (as a percent) 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= ctq_TermLoanMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
   
CenturyLink, Inc. affiliate | Revolving promissory note      
Long-term debt      
Note payable - affiliate     796,000,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= ctq_RevolvingPromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctq_CenturyLinkAffiliateMember
CenturyLink, Inc. affiliate | Qwest Corporation | Revolving promissory note      
Long-term debt      
Maximum borrowing capacity   1,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= ctq_RevolvingPromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctq_CenturyLinkAffiliateMember
 
Note payable - affiliate   796,000,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= ctq_RevolvingPromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctq_CenturyLinkAffiliateMember
 
Weighted average interest rate (as a percent)   6.657%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= ctq_RevolvingPromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctq_CenturyLinkAffiliateMember
 
Accrued interest payable on related party note payable   $ 22,000,000ctq_InterestPayableNotePayableRelatedParties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= ctq_RevolvingPromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctq_CenturyLinkAffiliateMember