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Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
In Millions, unless otherwise specified
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Mar. 31, 2015
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of assets measured on a recurring basis |
$ 1,823us-gaap_AssetsFairValueDisclosureRecurring |
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| Fair value of liabilities measured on a recurring basis |
1,756us-gaap_LiabilitiesFairValueDisclosureRecurring |
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Short-term Investments | Equity Securities
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of assets measured on a recurring basis |
298us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
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Short-term Investments | Fixed Income Securities
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of assets measured on a recurring basis |
249us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
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Other Current Assets | Fixed Income Securities
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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|
| Fair value of assets measured on a recurring basis |
250us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
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Other Assets | Fixed Income Securities
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of assets measured on a recurring basis |
915us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
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Other Assets | Interest Rate Swaps and Other
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of assets measured on a recurring basis |
111us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByAssetClassAxis
= vz_ForwardInterestRateSwapsAndOtherMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
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|
Other Current Liabilities | Cross Currency Swap and Other
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of liabilities measured on a recurring basis |
137us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_FairValueByAssetClassAxis
= vz_CrossCurrencySwapAndOtherMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
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Other Liabilities | Forward Interest Rate Swaps
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Fair value of liabilities measured on a recurring basis |
301us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_FairValueByAssetClassAxis
= vz_ForwardInterestRateSwapsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
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Other Liabilities | Cross Currency Swaps
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|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Fair value of liabilities measured on a recurring basis |
1,318us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CurrencySwapMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
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Level 1
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of assets measured on a recurring basis |
554us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
[1] |
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Level 1 | Short-term Investments | Equity Securities
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|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Fair value of assets measured on a recurring basis |
298us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
[1] |
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Level 1 | Short-term Investments | Fixed Income Securities
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Fair value of assets measured on a recurring basis |
6us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
[1] |
|
Level 1 | Other Current Assets | Fixed Income Securities
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|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of assets measured on a recurring basis |
250us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
[1] |
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Level 2
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Fair value of assets measured on a recurring basis |
1,269us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
[2] |
| Fair value of liabilities measured on a recurring basis |
1,756us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
[2] |
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Level 2 | Short-term Investments | Fixed Income Securities
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Fair value of assets measured on a recurring basis |
243us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShortTermInvestmentsMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
[2] |
|
Level 2 | Other Assets | Fixed Income Securities
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Fair value of assets measured on a recurring basis |
915us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
[2] |
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Level 2 | Other Assets | Interest Rate Swaps and Other
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Fair value of assets measured on a recurring basis |
111us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_FairValueByAssetClassAxis
= vz_ForwardInterestRateSwapsAndOtherMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
[2] |
|
Level 2 | Other Current Liabilities | Cross Currency Swap and Other
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Fair value of liabilities measured on a recurring basis |
137us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentLiabilitiesMember
/ us-gaap_FairValueByAssetClassAxis
= vz_CrossCurrencySwapAndOtherMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
[2] |
|
Level 2 | Other Liabilities | Forward Interest Rate Swaps
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Fair value of liabilities measured on a recurring basis |
301us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_FairValueByAssetClassAxis
= vz_ForwardInterestRateSwapsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
[2] |
|
Level 2 | Other Liabilities | Cross Currency Swaps
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Fair value of liabilities measured on a recurring basis |
$ 1,318us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CurrencySwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember |
[2] |
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