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BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Short-term borrowed funds | $ 243 | $ 274
Hedging basis adjustments | 2,153 | 984
Available borrowing capacity | 64,600 |
FHLB advances and letters of credit | Secured Debt |  |
Debt Instrument [Line Items] |  |
Short-term borrowed funds | 3,200 | 9,800
FHLB advances |  |
Debt Instrument [Line Items] |  |
Available borrowing capacity | 13,900 | 7,200
Parent company |  |
Debt Instrument [Line Items] |  |
Principal balance | 3,500 | 2,500
Unamortized deferred issuance costs and or discounts | (90) | (8)
Banking Subsidiaries |  |
Debt Instrument [Line Items] |  |
Principal balance | 4,800 | 11,500
Unamortized deferred issuance costs and or discounts | (11) | (13)
Hedging basis adjustments | $ 112 | $ 50

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