Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 2,693	$ 2,420	$ 2,242
Preferred stock dividends	(119)	(162)	(232)
Dividends and undistributed earnings allocated to participating securities	(2)	(1)	(1)
Net income available to common shareholders	$ 2,572	$ 2,257	$ 2,009
Basic average common shares (in shares)	352,565	352,865	369,911
Effect of dilutive securities: equity-based awards (in shares)	5,397	4,241	3,755
Diluted average common shares (in shares)	357,962	357,106	373,666
Anti-dilutive securities (in shares)	3	1,066	2,052
Earnings per common share:
Basic (in USD per share)	$ 7.30	$ 6.40	$ 5.43
Diluted (in USD per share)	$ 7.19	$ 6.32	$ 5.38