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Changes in Balances of Accumulated Other Comprehensive Income by Component (Detail) (USD $) In Millions, 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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Dec. 31, 2012
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| Equity And Accumulated Other Comprehensive Income [Line Items] |
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| Balance at January 1, 2014 |
$ 2,358us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
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| Other comprehensive income (loss) |
(363)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax |
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| Amounts reclassified to net income |
(884)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |
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| Net other comprehensive income (loss)attributable to Verizon |
(1,247)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |
123us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |
966us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |
| Balance at December 31, 2014 |
1,111us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
2,358us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
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| Foreign currency translation adjustments |
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| Equity And Accumulated Other Comprehensive Income [Line Items] |
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| Balance at January 1, 2014 |
853us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
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| Other comprehensive income (loss) |
(288)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
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| Amounts reclassified to net income |
(911)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
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| Net other comprehensive income (loss)attributable to Verizon |
(1,199)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
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| Balance at December 31, 2014 |
(346)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
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| Unrealized gain on cash flow hedges |
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| Equity And Accumulated Other Comprehensive Income [Line Items] |
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| Balance at January 1, 2014 |
113us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
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| Other comprehensive income (loss) |
(89)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
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| Amounts reclassified to net income |
(108)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
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| Net other comprehensive income (loss)attributable to Verizon |
(197)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
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| Balance at December 31, 2014 |
(84)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
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| Unrealized gain on marketable securities |
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| Equity And Accumulated Other Comprehensive Income [Line Items] |
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| Balance at January 1, 2014 |
117us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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| Other comprehensive income (loss) |
14us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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| Amounts reclassified to net income |
(19)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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| Net other comprehensive income (loss)attributable to Verizon |
(5)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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| Balance at December 31, 2014 |
112us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
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| Defined benefit pension and postretirement plans |
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| Equity And Accumulated Other Comprehensive Income [Line Items] |
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| Balance at January 1, 2014 |
1,275us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
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| Amounts reclassified to net income |
154us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
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| Net other comprehensive income (loss)attributable to Verizon |
154us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
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| Balance at December 31, 2014 |
$ 1,429us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
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