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Derivative Financial Instruments - Derivative Instruments and their Balance Sheet Classifications (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Derivative Assets $ 18 $ 33
Derivative Liabilities 16 11
Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 11 21
Derivative Liabilities 7 5
Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 7 12
Derivative Liabilities 9 6
Foreign Exchange Contracts [Member] | Designated as Hedging Instruments [Member] | Accrued liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 5 3
Foreign Exchange Contracts [Member] | Not Designated as Hedging Instruments [Member] | Accrued liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 8 5
Foreign Exchange Contracts [Member] | Prepaid and Other Current Assets [Member] | Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 8 13
Foreign Exchange Contracts [Member] | Prepaid and Other Current Assets [Member] | Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 4 10
Foreign Exchange Contracts [Member] | Other Assets [Member] | Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 3 8
Foreign Exchange Contracts [Member] | Other Assets [Member] | Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Assets 3 2
Foreign Exchange Contracts [Member] | Other Liabilities [Member] | Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities 2 2
Foreign Exchange Contracts [Member] | Other Liabilities [Member] | Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Liabilities $ 1 $ 1