Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ (66)	$ (26)	$ (118)	$ (12)
Income (loss) from continuing operations before income tax benefit (expense)	$ (1,466)	$ (399)	$ (2,960)	$ (1,622)
Effective income tax rate	4.50%	6.50%	4.00%	0.70%
Statutory federal income tax rate	21.00%	21.00%	21.00%	21.00%