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Accumulated Other Comprehensive Loss, Excluding Noncontrolling Interests Narrative (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Derivative Financial Instruments [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Prior service credits related primarily to benefit plan amendments $ 419us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Actuarial Gains/(Losses) [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Prior service credits related primarily to benefit plan amendments (549)us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember
Prior Service (Costs)/ Credits and Other [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Prior service credits related primarily to benefit plan amendments $ 138us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember