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Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Foreign Exchange Contract      
Derivative      
Contract notional amount of foreign exchange forward contracts $ 92 $ 92 $ 147
Net contract notional amount of foreign exchange forward contracts $ 34 $ 34 23
Interest Rate Swap      
Derivative      
Derivative, term of contract 5 years 5 years  
Contract notional amount of foreign exchange forward contracts $ 500 $ 500 $ 0