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Derivative Financial Instruments - Derivative Instruments and their Balance Sheet Classifications (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 43 $ 26
Derivative Liabilities 109 286
Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 24 5
Derivative Liabilities 92 237
Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 19 21
Derivative Liabilities 17 49
Foreign Exchange Contracts [Member] | Prepaid and Other Current Assets [Member] | Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 5 5
Foreign Exchange Contracts [Member] | Prepaid and Other Current Assets [Member] | Designated as Hedging Instruments [Member] | Accrued liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 88 212
Foreign Exchange Contracts [Member] | Prepaid and Other Current Assets [Member] | Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 12 21
Foreign Exchange Contracts [Member] | Prepaid and Other Current Assets [Member] | Not Designated as Hedging Instruments [Member] | Accrued liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 16 49
Foreign Exchange Contracts [Member] | Other Liabilities [Member] | Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 4 $ 25
Foreign Exchange Contracts [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 1  
Foreign Exchange Contracts [Member] | Other Assets [Member] | Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 19  
Foreign Exchange Contracts [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 7