Parent Company Financial Statements - Statement of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Total revenue	$ 12,148	$ 12,027	$ 11,703
Other	1,075	896	965
Total expenses	8,801	8,889	8,716
Income tax expense	553	478	479
Equity in undistributed income of consolidated subsidiaries and unconsolidated entities:
Net income	2,774	2,693	2,420
Parent Company
Condensed Financial Statements, Captions [Line Items]
Cash dividends from consolidated banking subsidiary	1,500	0	2,721
Cash dividends from consolidated non-banking subsidiaries and unconsolidated entities	198	170	118
Other, net	69	49	92
Total revenue	1,767	219	2,931
Interest expense	426	239	324
Other	93	315	172
Total expenses	519	554	496
Income tax expense	(121)	(153)	(109)
Income (Loss) before equity in undistributed income of consolidated subsidiaries and unconsolidated entities	1,369	(182)	2,544
Equity in undistributed income of consolidated subsidiaries and unconsolidated entities:
Consolidated banking subsidiary	1,275	2,657	(277)
Consolidated non-banking subsidiaries and unconsolidated entities	130	218	153
Net income	$ 2,774	$ 2,693	$ 2,420