PLEDGED ASSETS, RESTRICTED CASH, COLLATERAL, GUARANTEES AND COMMITMENTS - Restricted Cash (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 19,017	$ 16,976
Asset pledged as collateral
Restricted Cash and Cash Equivalents Items [Line Items]
Financial instruments owned, at fair value	3,900	1,800
Cash and due from banks
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	3,479	4,820
Deposits with banks, net of allowance
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 15,538	$ 12,156