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BORROWED FUNDS - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Interest rate swaps $ 664 [1],[2] $ 759
Short-term borrowed funds 1,958 4,359
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt    
Debt Instrument [Line Items]    
Short-term borrowed funds 10,400 13,400
Federal Home Loan advances    
Debt Instrument [Line Items]    
Available borrowing capacity 6,100 2,800
Federal Reserve Bank advances    
Debt Instrument [Line Items]    
Available borrowing capacity 39,100  
Parent Company    
Debt Instrument [Line Items]    
Principal balance 2,300 2,300
Unamortized deferred issuance costs and discount (6) (7)
Bank Subsidiaries    
Debt Instrument [Line Items]    
Principal balance 11,100 10,500
Unamortized deferred issuance costs and discount (17) (12)
Interest rate swaps $ (36) $ (40)
[1] Amounts reflect changes in the treatment of variation margin on certain centrally cleared derivatives.
[2] Amounts reflect changes in the treatment of variation margin on certain centrally cleared derivatives.