Income Taxes - Income before income taxes and noncontrolling interests (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
U.S. earnings (loss) before income taxes	$ (884)	$ (599)	$ (138)
Foreign earnings (loss) before income taxes	(117)	398	312
Earnings (loss) before income taxes and noncontrolling interests	$ (1,001)	$ (201)	$ 174