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BORROWED FUNDS - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Short-term borrowed funds $ 252 $ 274
Hedging basis adjustments 2,286 984
Available borrowing capacity 61,700  
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt    
Debt Instrument [Line Items]    
Short-term borrowed funds 3,700 9,800
Federal Home Loan Bank advances    
Debt Instrument [Line Items]    
Available borrowing capacity 13,200 7,200
Parent Company    
Debt Instrument [Line Items]    
Principal balance 3,500 2,500
Unamortized deferred issuance costs and/or discounts (92) (8)
Banking Subsidiaries    
Debt Instrument [Line Items]    
Principal balance 5,600 11,500
Unamortized deferred issuance costs and/or discounts (13) (13)
Hedging basis adjustments $ 128 $ 50