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Risk Management - Summary of Fair Values and Location in Condensed Consolidated Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Not Designated As Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets $ 5  
Fair value of derivative liabilities 5  
Foreign exchange contracts | Designated as Hedging Instrument | Other assets    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 0  
Foreign exchange contracts | Designated as Hedging Instrument | Accrued liabilities    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 3  
Foreign exchange contracts | Not Designated As Hedging Instruments | Other assets    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 5 $ 9
Foreign exchange contracts | Not Designated As Hedging Instruments | Accrued liabilities    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities $ 2 $ 32