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No authoritative reference available. false 11 (Gains) losses recognized in net income 2 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -3000000 -3 false false false 2 false true false false 6000000 6 false false false 3 false true false false -7000000 -7 [1] false false false 4 false true false false 8000000 8 false false false 5 false true false false 21000000 21 [2] false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents total gains or losses for the period (realized and unrealized), arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. 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No authoritative reference available. false 13 Balance at end of period 2 twc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityValueInstant twc false credit instant This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required... false false false false false false false false false true false periodendlabel false 1 false true false false 17000000 17 false false false 2 false false false false 0 0 false false false 3 false true false false 17000000 17 false false false 4 false false false false 0 0 false false false 5 false true false false 35000000 35 false false false 6 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. No authoritative reference available. false 14 Fair value of debt in excess of carrying value 2 twc_ExcessFairValueDebt twc false credit instant The fair value of fixed-rate debt and mandatorily redeemable preferred equity in excess of the carrying value of such debt as... false false false false false false false false false false false terselabel false 1 false true false false 3120000000 3120 false false false 2 false false false false 0 0 false false false 3 false true false false 3120000000 3120 false false false 4 false false false false 0 0 false false false 5 false true false false 2268000000 2268 false false false 6 false false false false 0 0 false false false xbrli:monetaryItemType monetary The fair value of fixed-rate debt and mandatorily redeemable preferred equity in excess of the carrying value of such debt as of period end. 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