Earnings Per Common Share - Computation of Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Basic EPS:
Net income	$ 846	$ 822	$ 127
Weighted average common shares outstanding (in shares)	656,996	653,612	650,345
Basic EPS (in dollars per share)	$ 1.29	$ 1.26	$ 0.20
Diluted EPS:
Net income	$ 846	$ 822	$ 127
Interest expense on 6.50% convertible senior notes	51	46	0
Net income for purposes of computing diluted EPS	$ 897	$ 868	$ 127
Share computation for diluted EPS:
Basic weighted average common shares outstanding (in shares)	656,996	653,612	650,345
Dilutive effect of stock awards (in shares)	1,121	1,830	1,579
Dilutive effect of certain PSP Warrants and Treasury Loan Warrants (in shares)	1,455	2,499	3,198
Assumed conversion of 6.50% convertible senior notes (in shares)	61,728	61,728	0
Diluted weighted average common shares outstanding (in shares)	721,300	719,669	655,122
Diluted EPS (in dollars per share)	$ 1.24	$ 1.21	$ 0.19