Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net income	$ 730	$ 711	$ 463	$ 422	$ 763	$ 549	$ 1,904	$ 1,734
Preferred stock dividends	(48)			(24)			(148)	(84)
Dividends and undistributed earnings allocated to participating securities	0			0			(1)	(1)
Net income available to common shareholders, basic	682			398			1,755	1,649
Net income available to common shareholders, diluted	$ 682			$ 398			$ 1,755	$ 1,649
Basic average common shares (in shares)	297,365			313,147			299,964	327,776
Effect of dilutive securities: equity-based awards (in shares)	4,482			4,182			4,212	4,235
Diluted average common shares (in shares)	301,847			317,329			304,176	332,011
Anti-dilutive securities (in shares)	3			1,683			728	1,368
Earnings per common share, basic:
Basic (in USD per share)	$ 2.29			$ 1.27			$ 5.85	$ 5.03
Earnings per common share, diluted:
Diluted (in USD per share)	$ 2.26			$ 1.25			$ 5.77	$ 4.97