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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Accumulated other comprehensive income (loss), Beginning balance   $ (145)     $ (145)
Other comprehensive income (loss) $ 2 1 $ 8 $ (39)  
Accumulated other comprehensive income (loss), Ending balance (142)       (142)
Accumulated Other Comprehensive Income (Loss) [Member]          
Accumulated other comprehensive income (loss), Beginning balance   (145)     (145)
Other comprehensive income (loss) 2 $ 1 $ 8 $ (39) 3
Accumulated other comprehensive income (loss), Ending balance $ (142)       $ (142)