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Income Taxes - Difference Between Effective Tax Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax provision (benefit) at federal statutory rate	$ 12	$ (18)	$ (81)
Foreign tax rate differential	2	(2)	2
State income tax provision (benefit), net of federal benefit	3	(5)	(3)
Nondeductible expenses	9	2	8
Foreign tax credits	21	(31)	(2)
Benefit of net operating loss	(14)
One-time transition tax	1	33
U.S. tax rate change		69
Change in valuation allowance	(28)	(45)	78
Change in contingency reserve and other		$ (3)	2
Income tax provision (benefit)	$ 6		$ 4
Effective tax rate	10.70%	0.00%	(1.60%)

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