Income Taxes - Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ 20	$ 10	$ 14
State	3	8	6
Foreign	77	62	31
Total current	100	80	51
Deferred:
Federal	(11)	20	(31)
State	5	(10)	(6)
Foreign	9	(19)	(6)
Total deferred	3	(9)	(43)
(Benefit) provision for income taxes	$ 103	$ 71	$ 8