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BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jun. 29, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Hedging basis adjustments | $ 300 |  | $ 693
Short-term borrowed funds | 2,380 |  | 2,671
Available borrowing capacity | 36,300 |  |
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Short-term borrowed funds | 13,800 |  | 9,400
Federal Home Loan Bank advances |  |  |
Debt Instrument [Line Items] |  |  |
Available borrowing capacity | 3,700 |  | 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 | 13,800 |  | 9,500
Unamortized deferred issuance costs and/or discounts | (17) |  | (19)
Hedging basis adjustments | $ (105) |  | $ (63)
5.158% fixed-to-floating rate callable subordinated debt | Parent Company | Subordinated Debt |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 5.158% |

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