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Derivative Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 53us-gaap_DerivativeFairValueOfDerivativeAsset $ 59us-gaap_DerivativeFairValueOfDerivativeAsset
Derivative Liabilities 399us-gaap_DerivativeFairValueOfDerivativeLiability 40us-gaap_DerivativeFairValueOfDerivativeLiability
Fair value of the Company's foreign currency forward contracts 346us-gaap_DerivativeFairValueOfDerivativeNet  
Fair Value, Inputs, Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 53us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
 
Derivative Liabilities $ 399us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member