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 |