Interest Income and Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Interest income
Loans	$ 23,509	$ 22,311	$ 69,281	$ 60,325
Taxable securities	5,849	4,513	15,844	12,674
Non-taxable securities	298	360	923	951
Total investment securities	6,147	4,873	16,767	13,625
Trading assets - debt instruments	5,613	4,164	15,198	11,823
Federal funds sold and securities purchased under resale agreements	5,226	3,951	14,262	10,849
Securities borrowed	2,478	2,085	6,821	5,667
Deposits with banks	5,366	5,270	17,811	15,278
All other interest-earning assets	2,077	1,902	6,227	5,637
Total interest income	50,416	44,556	146,367	123,204
Interest expense
Interest-bearing deposits	12,914	10,796	37,569	28,024
Federal funds purchased and securities loaned or sold under repurchase agreements	5,733	3,523	14,810	9,727
Short-term borrowings	542	512	1,579	1,361
Trading liabilities – debt and all other interest-bearing liabilities	2,632	2,463	7,872	6,807
Long-term debt	4,838	4,239	14,236	11,428
Beneficial interest issued by consolidated VIEs	352	297	1,068	641
Total interest expense	27,011	21,830	77,134	57,988
Net interest income	23,405	22,726	69,233	65,216
Provision for credit losses	3,111	1,384	8,047	6,558
Net interest income after provision for credit losses	$ 20,294	$ 21,342	$ 61,186	$ 58,658