Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate	(2.60%)	22.50%	51.40%	19.30%
Income tax expense	$ 23	$ 82	$ 460	$ 356
Income (loss) before income taxes	$ (868)	$ 364	$ 895	$ 1,840