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Income Taxes - Components of the Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
U.S. Federal:      
Current     $ 2
Deferred     (1)
U.S. Federal, Total     1
U.S. State:      
Current $ 1    
U.S. State, Total 1    
Foreign      
Current 6 $ 1 3
Deferred (1) $ (1)  
Foreign, Total 5   3
Income tax provision (benefit) $ 6   $ 4