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BORROWED FUNDS - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Hedging basis adjustments $ 597 $ 449
Short-term borrowed funds 679 1,317
Available borrowing capacity 42,500  
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt    
Debt Instrument [Line Items]    
Short-term borrowed funds 7,700 13,000
Federal Home Loan Bank advances    
Debt Instrument [Line Items]    
Available borrowing capacity 8,400 4,800
Parent Company    
Debt Instrument [Line Items]    
Principal balance 2,000 2,000
Unamortized deferred issuance costs and/or discounts (4) (5)
Banking Subsidiaries    
Debt Instrument [Line Items]    
Principal balance 9,800 14,000
Unamortized deferred issuance costs and/or discounts (18) (14)
Hedging basis adjustments $ (23) $ (66)