Parent Company (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Non-interest revenues
Total non-interest revenues	$ 34,630	$ 28,102	$ 34,936
Interest income	9,033	10,083	12,084
Interest expense	1,283	2,098	3,464
Total revenues net of interest expense	42,380	36,087	43,556
Expenses
Salaries and employee benefits	6,240	5,718	5,911
Other	4,817	5,325	5,856
Total expenses	33,110	27,061	31,554
Income tax provision (benefit)	2,629	1,161	1,670
Net income	8,060	3,135	6,759
Parent Company
Non-interest revenues
Other	343	480	598
Total non-interest revenues	343	480	598
Interest income	96	228	692
Interest expense	482	630	902
Total revenues net of interest expense	(43)	78	388
Expenses
Salaries and employee benefits	359	333	366
Other	346	562	816
Total expenses	705	895	1,182
Pretax income	(748)	(817)	(794)
Income tax provision (benefit)	(248)	(236)	(282)
Net loss before equity in net income of subsidiaries and affiliates	(500)	(581)	(512)
Equity in net income of subsidiaries and affiliates	8,560	3,716	7,271
Net income	$ 8,060	$ 3,135	$ 6,759