Parent Company - Condensed Statements of Income and Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Non-interest revenues
Total non-interest revenues	$ 50,406	$ 47,381	$ 42,967
Interest income	23,795	19,983	12,658
Interest expense	8,252	6,849	2,763
Total revenues net of interest expense	65,949	60,515	52,862
Expenses
Salaries and employee benefits	8,198	8,067	7,252
Other	6,364	6,807	6,481
Total expenses	47,869	45,079	41,095
Income tax benefit	2,766	2,139	2,071
Net income	10,129	8,374	7,514
Net unrealized pension and other postretirement benefits, net of tax	25	37	52
Comprehensive income	9,806	8,512	7,249
Parent Company
Non-interest revenues
Other	390	407	388
Total non-interest revenues	390	407	388
Interest income	1,858	1,558	614
Interest expense	1,869	1,436	857
Total revenues net of interest expense	379	529	145
Expenses
Salaries and employee benefits	474	487	408
Other	385	408	372
Total expenses	859	895	780
Loss before income tax and equity in net income of subsidiaries	(480)	(366)	(635)
Income tax benefit	(126)	(163)	(244)
Equity in net income of subsidiaries and affiliates	10,483	8,577	7,905
Net income	10,129	8,374	7,514
Net unrealized pension and other postretirement benefits, net of tax	41	5	10
Other comprehensive income (loss), net	(364)	133	(275)
Comprehensive income	$ 9,806	$ 8,512	$ 7,249