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BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-term borrowed funds | $ 255 | $ 274
Hedging basis adjustments | 2,452 | 984
Available borrowing capacity | 61,800 |
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt |  |
Debt Instrument [Line Items] |  |
Short-term borrowed funds | 4,000 | 9,800
Federal Home Loan Bank advances |  |
Debt Instrument [Line Items] |  |
Available borrowing capacity | 13,000 | 7,200
Parent Company |  |
Debt Instrument [Line Items] |  |
Principal balance | 3,500 | 2,500
Unamortized deferred issuance costs and/or discounts | (14) | (8)
Banking Subsidiaries |  |
Debt Instrument [Line Items] |  |
Principal balance | 5,500 | 11,500
Unamortized deferred issuance costs and/or discounts | (14) | (13)
Hedging basis adjustments | $ 145 | $ 50

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