INTEREST REVENUE AND EXPENSE (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest revenue
Loan interest, including fees	$ 9,495	$ 8,733	$ 18,211	$ 17,642
Deposits with banks	658	126	954	271
Securities borrowed and purchased under agreements to resell	805	205	1,199	499
Investments, including dividends	2,370	1,818	4,420	3,570
Trading account assets	1,659	1,470	2,805	2,807
Other interest-bearing assets(2)	643	111	1,192	208
Total interest revenue	15,630	12,463	28,781	24,997
Interest expense
Deposits	1,420	676	2,291	1,388
Securities loaned and sold under agreements to repurchase	655	260	937	513
Trading account liabilities	137	150	284	264
Short-term borrowings and other interest-bearing liabilities(3)	268	31	323	62
Long-term debt	1,186	868	2,111	1,786
Total interest expense	3,666	1,985	5,946	4,013
Net interest income	11,964	10,478	22,835	20,984
Provision (benefit) for credit losses on loans	1,384	(1,126)	1,644	(2,605)
Net interest income after provision for credit losses on loans	10,580	11,604	21,191	23,589
Consumer
Interest revenue
Loan interest, including fees	6,601	6,521	12,863	13,223
Corporate
Interest revenue
Loan interest, including fees	$ 2,894	$ 2,212	$ 5,348	$ 4,419