Income Taxes - Geographic Source of (Loss) Income Before Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S.	$ (2,031)	$ (2,450)	$ 123
Other than U.S.	(795)	(121)	126
(Loss) income before provision for income taxes	$ (2,826)	$ (2,571)	$ 249