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, 2024	Mar. 31, 2023
Basic EPS:
Net income (loss)	$ (312)	$ 10
Basic weighted average common shares outstanding (in shares)	655,847	652,000
Basic EPS (in dollars per share)	$ (0.48)	$ 0.02
Diluted EPS:
Net income (loss) for purposes of computing diluted EPS	$ (312)	$ 10
Dilutive effect of stock awards (in shares)	0	1,064
Dilutive effect of certain PSP Warrants and Treasury Loan Warrants (in shares)	0	3,643
Diluted weighted average common shares outstanding (in shares)	655,847	656,707
Diluted EPS (in dollars per share)	$ (0.48)	$ 0.02