Income Taxes - Summary of Our Domestic and Foreign Income (Loss) Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ (262)	$ 92	$ 104
Foreign	(107)	102	69
Income (loss) before income taxes	$ (369)	$ 194	$ 173