LOANS - Corporate Loans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Loans
Loans, net of unearned income	$ 657,221	$ 667,767
Accrued interest receivable	1,000
Lease financing
Loans
Loans, net of unearned income	400	500
Corporate
Loans
Loans, net of unearned income	289,154	291,233
Unearned income	(797)	(770)
Accrued interest receivable	2,000
Loans sold and/or reclassified to held-for-sale	5,000	5,900
Corporate | Commercial and industrial
Loans
Loans, net of unearned income	147,803	147,004
Corporate | Financial institutions
Loans
Loans, net of unearned income	64,907	71,767
Corporate | Mortgage and real estate
Loans
Loans, net of unearned income	21,949	20,291
Corporate | Lease financing
Loans
Loans, net of unearned income	354	455
In U.S. offices | Corporate
Loans
Loans, net of unearned income	141,479	134,691
In U.S. offices | Corporate | Commercial and industrial
Loans
Loans, net of unearned income	56,176	48,364
In U.S. offices | Corporate | Financial institutions
Loans
Loans, net of unearned income	43,399	49,804
In U.S. offices | Corporate | Mortgage and real estate
Loans
Loans, net of unearned income	17,829	15,965
In U.S. offices | Corporate | Installment and other
Loans
Loans, net of unearned income	23,767	20,143
In U.S. offices | Corporate | Lease financing
Loans
Loans, net of unearned income	308	415
In offices outside the U.S. | Corporate
Loans
Loans, net of unearned income	147,675	156,542
In offices outside the U.S. | Corporate | Commercial and industrial
Loans
Loans, net of unearned income	93,967	102,735
In offices outside the U.S. | Corporate | Financial institutions
Loans
Loans, net of unearned income	21,931	22,158
In offices outside the U.S. | Corporate | Mortgage and real estate
Loans
Loans, net of unearned income	4,179	4,374
In offices outside the U.S. | Corporate | Installment and other
Loans
Loans, net of unearned income	23,347	22,812
In offices outside the U.S. | Corporate | Lease financing
Loans
Loans, net of unearned income	46	40
In offices outside the U.S. | Corporate | Government and official institutions
Loans
Loans, net of unearned income	$ 4,205	$ 4,423