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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Accumulated other comprehensive income (loss), Beginning balance     $ (145)       $ (145)
Other comprehensive loss $ (4) $ 2 1 $ 3 $ 8 $ (39)  
Accumulated other comprehensive income (loss), Ending balance (146)           (146)
Accumulated Other Comprehensive Income (Loss) [Member]              
Accumulated other comprehensive income (loss), Beginning balance     (145)       (145)
Other comprehensive loss (4) $ 2 $ 1 $ 3 $ 8 $ (39) (1)
Accumulated other comprehensive income (loss), Ending balance $ (146)           $ (146)