Parent Company Financial Statements - Statement of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Total revenue	$ 12,027	$ 11,703	$ 11,756
Other	896	965	1,262
Total expenses	8,889	8,716	9,034
Income tax expense	478	479	470
Equity in undistributed income of consolidated subsidiaries and unconsolidated entities:
Net income	2,693	2,420	2,242
Parent Company
Condensed Financial Statements, Captions [Line Items]
Cash dividends from consolidated banking subsidiary	0	2,721	3,300
Cash dividends from consolidated non-banking subsidiaries and unconsolidated entities	170	118	285
Other, net	49	92	149
Total revenue	219	2,931	3,734
Interest expense	239	324	415
Other	315	172	108
Total expenses	554	496	523
Income tax expense	(153)	(109)	(91)
Income (Loss) before equity in undistributed income of consolidated subsidiaries and unconsolidated entities	(182)	2,544	3,302
Equity in undistributed income of consolidated subsidiaries and unconsolidated entities:
Consolidated banking subsidiary	2,657	(277)	(1,070)
Consolidated non-banking subsidiaries and unconsolidated entities	218	153	10
Net income	$ 2,693	$ 2,420	$ 2,242