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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net increase to other comprehensive income or loss upon the translation $ (418)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax $ (51)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Changes in derivative financial instruments, net of tax (66)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 14us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Changes in derivative financial instruments, tax $ 21us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax $ 6us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax