Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net income	$ 711	$ 463	$ 763	$ 549	$ 1,174	$ 1,312
Preferred stock dividends	(55)		(37)		(100)	(60)
Dividends and undistributed earnings allocated to participating securities	(1)		0		(1)	(1)
Net income available to common shareholders, basic	655		726		1,073	1,251
Net income available to common shareholders, diluted	$ 655		$ 726		$ 1,073	$ 1,251
Basic average common shares (in shares)	300,564		329,383		301,278	335,212
Effect of dilutive securities: equity-based awards (in shares)	4,201		4,157		4,076	4,261
Diluted average common shares (in shares)	304,765		333,540		305,354	339,473
Anti-dilutive securities (in shares)	948		2,282		1,151	1,380
Earnings per common share, basic:
Basic (in USD per share)	$ 2.18		$ 2.20		$ 3.56	$ 3.73
Earnings per common share, diluted:
Diluted (in USD per share)	$ 2.15		$ 2.17		$ 3.52	$ 3.68