Earnings (Loss) per Common Share - Computation of Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Basic EPS:
Net income (loss)	$ 10	$ (1,635)
Basic weighted average common shares outstanding (in shares)	652,000	649,503
Basic EPS (in dollars per share)	$ 0.02	$ (2.52)
Diluted EPS:
Net income (loss) for purposes of computing diluted EPS	$ 10	$ (1,635)
Dilutive effect of stock awards (in shares)	1,064	0
Dilutive effect of warrants (in shares)	3,643	0
Diluted weighted average common shares outstanding (in shares)	656,707	649,503
Diluted EPS (in dollars per share)	$ 0.02	$ (2.52)