Derivative Financial Instruments - Additional Information (Detail) - Derivatives Not Designated as Hedging Instrument [Member] - Fair Value, Inputs, Level 2 [Member] - USD ($) $ in Millions |
3 Months Ended | |
---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
Derivatives Fair Value [Line Items] | ||
Foreign currency forward contracts, notional amount | $ 38 | $ 26 |
Other Expense [Member] | Maximum [Member] | ||
Derivatives Fair Value [Line Items] | ||
Foreign currency forward contracts, gain | 1 | 1 |
Prepaid and Other Current Assets [Member] | Maximum [Member] | ||
Derivatives Fair Value [Line Items] | ||
Foreign currency forward contracts, assets | 1 | 1 |
Other Current Liabilities [Member] | Maximum [Member] | ||
Derivatives Fair Value [Line Items] | ||
Foreign currency forward contracts, liability | $ 1 | $ 1 |