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Income Taxes - Components of the Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
U.S. Federal:            
Current         $ 2 $ (14)
Deferred         (1) (2)
U.S. Federal, Total         1 (16)
U.S. State:            
Current           (1)
U.S. State, Total           (1)
Foreign            
Current       $ 1 3 5
Deferred       $ (1)   (4)
Foreign, Total         3 1
Income tax provision (benefit) $ 23 $ (15) $ (4)   $ 4 $ (16)