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BORROWED FUNDS - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Short-term borrowed funds $ 263 $ 74
Hedging basis adjustments 2,771 1,509
Available borrowing capacity 62,600  
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt    
Debt Instrument [Line Items]    
Short-term borrowed funds 17,400 2,300
Federal Home Loan Bank advances    
Debt Instrument [Line Items]    
Available borrowing capacity 9,700 15,900
Parent Company    
Debt Instrument [Line Items]    
Principal balance 3,400 3,200
Unamortized deferred issuance costs and/or discounts 77 80
Banking Subsidiaries    
Debt Instrument [Line Items]    
Principal balance 13,000 3,800
Unamortized deferred issuance costs and/or discounts 8 7
Hedging basis adjustments $ (29) $ 42