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GUARANTEES AND COMMITMENTS - Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash $ 16,605 $ 16,976
Asset pledged as collateral    
Restricted Cash and Cash Equivalents Items [Line Items]    
Financial instruments, owned, at fair value 2,700 1,800
Cash and due from banks    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash 4,211 4,820
Deposits with banks, net of allowance    
Restricted Cash and Cash Equivalents Items [Line Items]    
Restricted cash $ 12,394 $ 12,156