Income Taxes - Components of the Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
U.S. State:
Current	$ 1	$ 1
U.S. State, Total	1	1
Foreign
Current	5	6	$ 1
Deferred	(2)	(1)	$ (1)
Foreign, Total	3	5
Income tax provision (benefit)	$ 4	$ 6