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Long-Term Debt and Revolving Promissory Note (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Long-term debt    
Long-term debt, gross $ 7,343,000,000us-gaap_DebtInstrumentCarryingAmount  
Capital lease and other obligations 32,000,000ctq_CapitalLeaseAndOtherObligations 72,000,000ctq_CapitalLeaseAndOtherObligations
Unamortized premiums, net 36,000,000us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet 75,000,000us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
Total long-term debt 7,379,000,000us-gaap_DebtAndCapitalLeaseObligations 7,558,000,000us-gaap_DebtAndCapitalLeaseObligations
Less current maturities (117,000,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent (637,000,000)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt, excluding current maturities 7,262,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations 6,921,000,000us-gaap_LongTermDebtAndCapitalLeaseObligations
Revolving Promissory Note [Abstract]    
Note payable-affiliate 796,000,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent 754,000,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
Senior notes    
Long-term debt    
Long-term debt, gross 7,311,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
7,411,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior notes | Minimum    
Long-term debt    
Interest rate, stated percentage (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, stated percentage (as a percent) 8.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Revolving promissory note | CenturyLink, Inc. affiliate    
Revolving Promissory Note [Abstract]    
Short-term debt, weighted average interest rate (as a percent) 6.657%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= ctq_RevolvingPromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctq_CenturyLinkAffiliateMember
 
Note payable-affiliate 796,000,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_LongtermDebtTypeAxis
= ctq_RevolvingPromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctq_CenturyLinkAffiliateMember
754,000,000us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_LongtermDebtTypeAxis
= ctq_RevolvingPromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctq_CenturyLinkAffiliateMember
Maximum borrowing capacity, note payable-affiliate 1,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= ctq_RevolvingPromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctq_CenturyLinkAffiliateMember
 
Accrued interest payable. note payable-affiliate $ 9,000,000us-gaap_InterestPayableCurrent
/ us-gaap_LongtermDebtTypeAxis
= ctq_RevolvingPromissoryNoteMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= ctq_CenturyLinkAffiliateMember