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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
Accumulated other comprehensive income (loss), Beginning balance $ (142)
Accumulated other comprehensive income (loss), Ending balance (104)
Accumulated Other Comprehensive Income (Loss) [Member]  
Accumulated other comprehensive income (loss), Beginning balance (142)
Other comprehensive income 38
Accumulated other comprehensive income (loss), Ending balance $ (104)