Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings (loss) available to common stockholders	$ (1,964)	$ (7,069)	$ 3,009
Basic weighted-average shares outstanding (in shares)	321.9	279.4	258.8
Effect of share-based awards (in shares)	0.0	0.0	1.1
Diluted weighted-average shares outstanding (in shares)	321.9	279.4	259.9
Earnings (loss) per share, basic (in dollars per share)	$ (6.10)	$ (25.30)	$ 11.63
Earnings (loss) per share, diluted (in dollars per share)	$ (6.10)	$ (25.30)	$ 11.58
Stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities	0.9	0.0	0.0
Employee stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities	0.7	1.0	0.1