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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated other comprehensive income (loss), Beginning balance $ (143)    
Other comprehensive income 15 $ (38) $ 37
Accumulated other comprehensive income (loss), Ending balance (128) (143)  
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated other comprehensive income (loss), Beginning balance (143)    
Other comprehensive income 15 (38) $ 37
Accumulated other comprehensive income (loss), Ending balance $ (128) $ (143)