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]
Income tax benefit (expense)	$ (19)	$ (66)	$ 57	$ (118)
Income (loss) from continuing operations before income tax benefit (expense)	$ (230)	$ (1,466)	$ 383	$ (2,960)
Effective income tax rate	8.30%	4.50%	14.90%	4.00%
Statutory federal income tax rate	21.00%	21.00%	21.00%	21.00%