Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 690	$ 747	$ 604	$ 714	$ 763	$ 519	$ 2,041	$ 1,996
Preferred stock dividends	(21)			(21)			(76)	(85)
Dividends and undistributed earnings allocated to participating securities	0			0			(1)	(1)
Net income available to common shareholders, basic	669			693			1,964	1,910
Net income available to common shareholders, diluted	$ 669			$ 693			$ 1,964	$ 1,910
Basic average common shares (in shares)	367,789			347,718			367,240	348,106
Effect of dilutive securities: equity-based awards (in shares)	4,629			5,776			4,954	5,270
Diluted average common shares (in shares)	372,418			353,494			372,194	353,376
Anti-dilutive securities (in shares)	1,592			97			904	119
Earnings per common share, basic:
Basic (in USD per share)	$ 1.82			$ 1.99			$ 5.35	$ 5.49
Earnings per common share, diluted:
Diluted (in USD per share)	$ 1.80			$ 1.96			$ 5.28	$ 5.40