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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Accounts receivable, allowance (dollars) $ 41us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 38us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Customer relationships, accumulated amortization 2,815ctq_FiniteLivedIntangibleAssetsCustomerRelationshipsAccumulatedAmortization 2,660ctq_FiniteLivedIntangibleAssetsCustomerRelationshipsAccumulatedAmortization
Other intangible assets, accumulated amortization $ 1,301us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization $ 1,247us-gaap_CapitalizedComputerSoftwareAccumulatedAmortization
Common stock, shares, issued (in shares) 1us-gaap_CommonStockSharesIssued 1us-gaap_CommonStockSharesIssued
Common stock, share outstanding (in shares) 1us-gaap_CommonStockSharesOutstanding 1us-gaap_CommonStockSharesOutstanding