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Derivative Financial Instruments - Derivative Instruments and their Balance Sheet Classifications (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 51 $ 26
Derivative Liabilities 43 286
Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 28 5
Derivative Liabilities 27 237
Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 23 21
Derivative Liabilities 16 49
Foreign Exchange Contracts [Member] | Prepaid and Other Current Assets [Member] | Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 28 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 27 212
Foreign Exchange Contracts [Member] | Prepaid and Other Current Assets [Member] | Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 23 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   $ 25