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Long-Term Debt and Revolving Promissory Note (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Long-term debt    
Capital lease and other obligations $ 26ctq_CapitalLeaseAndOtherObligations $ 32ctq_CapitalLeaseAndOtherObligations
Total long-term debt 7,467us-gaap_DebtAndCapitalLeaseObligations 7,379us-gaap_DebtAndCapitalLeaseObligations
Less current maturities (112)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent (117)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt, excluding current maturities 7,355us-gaap_LongTermDebtAndCapitalLeaseObligations 7,262us-gaap_LongTermDebtAndCapitalLeaseObligations
Senior notes    
Long-term debt    
Long-term debt, gross 7,311us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
7,311us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Unamortized premiums, net 30us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
36us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior notes | Minimum    
Long-term debt    
Interest rate (as a percent) 6.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Senior notes | Maximum    
Long-term debt    
Interest rate (as a percent) 8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Medium-term notes    
Long-term debt    
Long-term debt, gross 100us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
Revolving promissory note | CenturyLink, Inc. affiliate    
Long-term debt    
Note payable - affiliate   796us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= ctq_RevolvingPromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctq_CenturyLinkAffiliateMember
Qwest Corporation | Medium-term notes    
Long-term debt    
Interest rate at end of period - Term loan (percent) 1.93%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
 
Qwest Corporation | Revolving promissory note | CenturyLink, Inc. affiliate    
Long-term debt    
Note payable - affiliate $ 796us-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