INTEREST REVENUE AND EXPENSE (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Interest revenue
Loan interest, including fees	$ 8,716	$ 8,909
Deposits with banks	296	145
Securities borrowed and purchased under agreements to resell	394	294
Investments, including dividends	2,050	1,752
Trading account assets	1,146	1,337
Other interest-bearing assets	549	97
Total interest revenue	13,151	12,534
Interest expense
Deposits	871	712
Securities loaned and sold under agreements to repurchase	282	253
Trading account liabilities	147	114
Short-term borrowings and other interest-bearing liabilities	55	31
Long-term debt	925	918
Total interest expense	2,280	2,028
Net interest income	10,871	10,506
Provision (benefit) for credit losses on loans	260	(1,479)
Net interest income after provision for credit losses on loans	10,611	11,985
Consumer
Interest revenue
Loan interest, including fees	6,262	6,702
Corporate
Interest revenue
Loan interest, including fees	$ 2,454	$ 2,207