Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Effective tax rates before discrete tax items	47.00%	31.00%
Income tax expense (benefit) before discrete tax items	$ (1)	$ 25
(Benefit)/provision for income taxes	$ 11	$ 32
Liabilities for unrecognized tax benefits			$ 164