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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Accumulated other comprehensive income (loss), Beginning balance     $ (143)      
Other comprehensive income $ (11) $ 1 10 $ 4 $ (20) $ 1
Accumulated other comprehensive income (loss), Ending balance (143)          
Accumulated Other Comprehensive Income (Loss) [Member]            
Accumulated other comprehensive income (loss), Beginning balance     (143)      
Other comprehensive income (11) $ 1 $ 10 $ 4 $ (20) $ 1
Accumulated other comprehensive income (loss), Ending balance $ (143)