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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, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Accumulated other comprehensive income (loss), Beginning balance   $ (128)     $ (128)
Other comprehensive income (loss) $ 8 (39) $ 1 $ 10  
Accumulated other comprehensive income (loss), Ending balance (159)       (159)
Accumulated Other Comprehensive Income (Loss) [Member]          
Accumulated other comprehensive income (loss), Beginning balance   (128)     (128)
Other comprehensive income (loss) 8 $ (39) $ 1 $ 10 (31)
Accumulated other comprehensive income (loss), Ending balance $ (159)       $ (159)