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Fair Value Measurements and Financial Instruments - Additional Information (Detail) (USD $)
In Billions, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Jun. 30, 2014
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Mar. 31, 2014
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| Fair Value, Measurements, Nonrecurring |
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| Derivatives, Fair Value [Line Items] |
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| Expected disposal losses of long-lived assets |
$ 0.1vz_ExpectedDisposalLoss
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember |
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| Derivative Collateral |
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| Derivatives, Fair Value [Line Items] |
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| Derivative asset fair value of collateral |
0.6us-gaap_DerivativeAssetFairValueOfCollateral
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= vz_DerivativeCollateralMember |
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| Interest Rate Swap |
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| Derivatives, Fair Value [Line Items] |
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| Notional amount |
1.80invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember |
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1.80invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember |
1.25invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember |
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| Forward Interest Rate Swaps |
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| Derivatives, Fair Value [Line Items] |
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| Notional amount |
4.80invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= vz_ForwardInterestRateSwapsMember |
2.00invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= vz_ForwardInterestRateSwapsMember |
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| Fair value of notional amount |
0.2us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= vz_ForwardInterestRateSwapsMember |
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| Forward Interest Rate Swaps Settled |
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| Derivatives, Fair Value [Line Items] |
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| Notional amount |
2.80invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= vz_ForwardInterestRateSwapsSettledMember |
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| Previously Issued Cross Currency Swaps |
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| Derivatives, Fair Value [Line Items] |
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| Derivative amount of hedged item |
1.6us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= vz_PreviouslyIssuedCrossCurrencySwapsMember |
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| Currency Swap Settled |
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| Derivatives, Fair Value [Line Items] |
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| Notional amount |
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0.80invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= vz_CurrencySwapSettledMember |
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| Cross Currency Swaps |
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| Derivatives, Fair Value [Line Items] |
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| Derivative amount of hedged item |
3.0us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember |
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1.2us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember |
5.4us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember |
| Fair value of cross currency swaps |
0.6us-gaap_ForeignCurrencyCashFlowHedgeDerivativeAtFairValueNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember |
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| Pre-tax gain (loss) recognized in other comprehensive income (loss) |
$ (0.1)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember |
$ (0.1)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember |
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