Interest Income and Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Interest income
Loans	$ 24,025	$ 23,509	$ 69,494	$ 69,281
Taxable securities	7,135	5,849	19,806	15,844
Non-taxable securities	294	298	837	923
Total investment securities	7,429	6,147	20,643	16,767
Trading assets - debt instruments	6,284	5,613	18,139	15,198
Federal funds sold and securities purchased under resale agreements	4,531	5,226	13,325	14,262
Securities borrowed	2,163	2,478	6,681	6,821
Deposits with banks	2,946	5,366	10,480	17,811
All other interest-earning assets	2,061	2,077	5,771	6,227
Total interest income	49,439	50,416	144,533	146,367
Interest expense
Interest-bearing deposits	11,633	12,914	34,111	37,569
Federal funds purchased and securities loaned or sold under repurchase agreements	6,043	5,733	17,197	14,810
Short-term borrowings	590	542	1,732	1,579
Trading liabilities – debt and all other interest-bearing liabilities	2,316	2,632	6,685	7,872
Long-term debt	4,558	4,838	13,434	14,236
Beneficial interest issued by consolidated VIEs	333	352	926	1,068
Total interest expense	25,473	27,011	74,085	77,134
Net interest income	23,966	23,405	70,448	69,233
Provision for credit losses	3,403	3,111	9,557	8,047
Net interest income after provision for credit losses	$ 20,563	$ 20,294	$ 60,891	$ 61,186