Earnings (Loss) Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Earnings (loss) available to common stockholders	$ 329	$ (434)	$ (1,048)	$ (1,791)
Weighted-average shares outstanding, basic (in shares)	326,700	323,600	325,900	320,100
Dilutive effect of employee stock awards (in shares)	1,700	0	0	0
Dilutive effect of stock warrants (in shares)	1,900	0	0	0
Weighted-average shares outstanding, diluted (in shares)	330,300	323,600	325,900	320,100
Earnings (loss) per share, basic (in dollars per share)	$ 1.01	$ (1.34)	$ (3.22)	$ (5.60)
Earnings (loss) per share, diluted ( in dollars per share)	$ 1.00	$ (1.34)	$ (3.22)	$ (5.60)
Stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities	1,500	0	1,500	300
Employee stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities	700	700	700	700