Interest Income and Interest Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest income
Loans	$ 41,537	$ 43,758	$ 51,855
Taxable securities	6,460	7,843	7,962
Non-taxable securities	1,063	1,184	1,329
Total investment securities	7,523	9,027	9,291
Trading assets - debt instruments	6,825	7,832	9,141
Federal funds sold and securities purchased under resale agreements	958	2,436	6,146
Securities borrowed	(385)	(302)	1,574
Deposits with banks	512	749	3,887
All other interest-earning assets	894	1,023	2,146
Total interest income	57,864	64,523	84,040
Interest expense
Interest bearing deposits	531	2,357	8,957
Federal funds purchased and securities loaned or sold under repurchase agreements	274	1,058	4,630
Short-term borrowings	126	372	1,248
Trading liabilities – debt and all other interest-bearing liabilities	257	195	2,585
Long-term debt	4,282	5,764	8,807
Beneficial interest issued by consolidated VIEs	83	214	568
Total interest expense	5,553	9,960	26,795
Net interest income	52,311	54,563	57,245
Provision for credit losses	(9,256)	17,480	5,585
Net interest income after provision for credit losses	$ 61,567	$ 37,083	$ 51,660