INTEREST INCOME AND 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
Loan interest, including fees	$ 15,805	$ 15,041	$ 46,829	$ 42,381
Deposits with banks	3,050	2,645	8,407	8,725
Securities borrowed and purchased under agreements to resell	7,293	7,363	22,326	18,791
Investments, including dividends	4,683	4,719	14,353	13,314
Trading account assets	4,451	3,893	13,082	10,391
Other interest-earning assets	1,174	1,176	3,669	3,277
Total interest income	36,456	34,837	108,666	96,879
Interest expense
Deposits	10,319	9,630	30,965	26,065
Securities loaned and sold under agreements to repurchase	7,328	6,090	21,256	14,609
Trading account liabilities	792	892	2,417	2,549
Short-term borrowings and other interest-bearing liabilities	2,009	1,956	5,873	5,382
Long-term debt	2,646	2,441	7,793	7,198
Total interest expense	23,094	21,009	68,304	55,803
Net interest income	13,362	13,828	40,362	41,076
Provision for credit losses on loans	2,382	1,816	7,163	5,314
Net interest income after provision for credit losses on loans	10,980	12,012	33,199	35,762
Consumer loans
Interest income
Loan interest, including fees	10,051	9,609	29,629	27,195
Corporate loans
Interest income
Loan interest, including fees	$ 5,754	$ 5,432	$ 17,200	$ 15,186