INTEREST INCOME AND EXPENSE (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest income
Loan interest, including fees	$ 57,868	$ 41,242	$ 35,440
Deposits with banks	11,238	4,515	577
Securities borrowed and purchased under agreements to resell	26,887	7,154	1,052
Investments, including dividends	18,300	11,214	7,388
Trading account assets	14,458	7,418	5,365
Other interest-bearing assets	4,507	2,865	653
Total interest income	133,258	74,408	50,475
Interest expense
Deposits	36,300	11,559	2,896
Securities loaned and sold under agreements to repurchase	21,439	4,455	1,012
Trading account liabilities	3,427	1,437	482
Short-term borrowings and other interest-bearing liabilities	7,438	2,488	121
Long-term debt	9,754	5,801	3,470
Total interest expense	78,358	25,740	7,981
Net interest income	54,900	48,668	42,494
Provision for credit losses on loans	7,786	4,745	(3,103)
Net interest revenue after provision for loan losses	47,114	43,923	45,597
Consumer
Interest income
Loan interest, including fees	36,864	28,391	26,408
Corporate
Interest income
Loan interest, including fees	$ 21,004	$ 12,851	$ 9,032