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BORROWED FUNDS - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Hedging basis adjustments $ 449 $ 693
Short-term borrowed funds 2,809 2,671
Available borrowing capacity 36,200  
FHLB advances and letters of credit | Secured Debt    
Debt Instrument [Line Items]    
Short-term borrowed funds 13,000 9,400
FHLB advances    
Debt Instrument [Line Items]    
Available borrowing capacity 4,800 8,000
Parent company    
Debt Instrument [Line Items]    
Principal balance 2,000 2,300
Unamortized deferred issuance costs and or discounts (5) (5)
Banking Subsidiaries    
Debt Instrument [Line Items]    
Principal balance 12,500 9,500
Unamortized deferred issuance costs and or discounts (14) (19)
Hedging basis adjustments $ (58) $ (63)