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Income Taxes - Difference Between Effective Tax Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax provision (benefit) at federal statutory rate	$ (19)	$ 12	$ (18)
Foreign tax rate differential	2	2	(2)
State income tax provision (benefit), net of federal benefit		3	(5)
Nondeductible expenses	3	9	2
Foreign tax credits	1	21	(31)
Benefit of net operating loss		(14)
One-time transition tax		1	33
U.S. tax rate change			69
Investment in subsidiaries	(9)
Nondeductible goodwill impairment	16
Change in valuation allowance	9	(28)	(45)
Change in contingency reserve and other	1		$ (3)
Income tax provision (benefit)	$ 4	$ 6
Effective tax rate	(4.40%)	10.70%	0.00%

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