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BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Hedging basis adjustments | $ 969 | $ 449
Short-term borrowed funds | 1,441 | 1,317
Available borrowing capacity | 42,800 |
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt |  |
Debt Instrument [Line Items] |  |
Short-term borrowed funds | 7,400 | 13,000
Federal Home Loan Bank advances |  |
Debt Instrument [Line Items] |  |
Available borrowing capacity | 9,000 | 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 | 9,500 | 14,000
Unamortized deferred issuance costs and/or discounts | (17) | (14)
Hedging basis adjustments | $ 43 | $ (66)

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