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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