Interest Income and Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Interest income
Loans	$ 10,633	$ 10,187
Taxable securities	1,979	1,605
Non-taxable securities	245	277
Total investment securities	2,224	1,882
Trading assets - debt instruments	1,767	1,782
Federal funds sold and securities purchased under resale agreements	397	233
Securities borrowed	(87)	(77)
Deposits with banks	238	65
All other interest-earning assets	324	199
Total interest income	15,496	14,271
Interest expense
Interest-bearing deposits	182	146
Federal funds purchased and securities loaned or sold under repurchase agreements	117	15
Short-term borrowings	40	33
Trading liabilities – debt and all other interest-bearing liabilities	191	27
Long-term debt	1,076	1,134
Beneficial interest issued by consolidated VIEs	18	27
Total interest expense	1,624	1,382
Net interest income	13,872	12,889
Provision for credit losses	1,463	(4,156)
Net interest income after provision for credit losses	$ 12,409	$ 17,045