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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated other comprehensive income (loss), Beginning balance $ (128)    
Other comprehensive loss (17) $ 15 $ (38)
Accumulated other comprehensive income (loss), Ending balance (145) (128)  
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated other comprehensive income (loss), Beginning balance (128)    
Other comprehensive loss (17) 15 $ (38)
Accumulated other comprehensive income (loss), Ending balance $ (145) $ (128)