Earnings Per Common Share - Computation of Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Basic EPS:
Net income	$ 111	$ 846	$ 822
Weighted average common shares outstanding (in shares)	659,964	656,996	653,612
Basic EPS (in dollars per share)	$ 0.17	$ 1.29	$ 1.26
Diluted EPS:
Net income	$ 111	$ 846	$ 822
Interest expense on 6.50% convertible senior notes	0	51	46
Net income for purposes of computing diluted EPS	$ 111	$ 897	$ 868
Share computation for diluted EPS:
Basic weighted average common shares outstanding (in shares)	659,964	656,996	653,612
Dilutive effect of restricted stock unit awards (in shares)	763	1,121	1,830
Dilutive effect of certain PSP Warrants and Treasury Loan Warrants (in shares)	325	1,455	2,499
Assumed conversion of 6.50% convertible senior notes (in shares)	0	61,728	61,728
Diluted weighted average common shares outstanding (in shares)	661,052	721,300	719,669
Diluted EPS (in dollars per share)	$ 0.17	$ 1.24	$ 1.21