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Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Recurring [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Assets:  
Derivative Financial Instruments, Assets $ 14us-gaap_DerivativeAssets
Interest rate swaps [Member]
 
Assets:  
Derivative Financial Instruments, Assets 4us-gaap_DerivativeAssets
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember
Forward contracts [Member]
 
Assets:  
Derivative Financial Instruments, Assets 10us-gaap_DerivativeAssets
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
Liabilities:  
Derivative Financial Instruments, Liabilities 20us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
Level 2 [Member]  
Assets:  
Derivative Financial Instruments, Assets 14us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Level 2 [Member] | Interest rate swaps [Member]  
Assets:  
Derivative Financial Instruments, Assets 4us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember
Level 2 [Member] | Forward contracts [Member]  
Assets:  
Derivative Financial Instruments, Assets 10us-gaap_DerivativeAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember
Liabilities:  
Derivative Financial Instruments, Liabilities $ 20us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember