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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated other comprehensive income (loss), Beginning balance $ (143)  
Other comprehensive income 10 $ 1
Accumulated other comprehensive income (loss), Ending balance (133)  
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated other comprehensive income (loss), Beginning balance (143)  
Other comprehensive income 10 $ 1
Accumulated other comprehensive income (loss), Ending balance $ (133)