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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net increase to other comprehensive income or loss upon the translation $ (532)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax $ (115)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax $ 64us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Currency translation gains reclassified from accumulated other comprehensive income (loss) (11)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax 25us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax  
Changes in derivative financial instruments, net of tax (233)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (37)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 99us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Changes in derivative financial instruments, tax $ (89)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax $ (18)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax $ 39us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax