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BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Principal balance | $ 12,500 | $ 13,600
Unamortized deferred issuance costs and or discounts | 85 | 74
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | (8) | (17)
Short-term borrowed funds | 0 | 505
Available borrowing capacity | 74,000 |
FHLB advances and letters of credit | Secured Debt |  |
Debt Instrument [Line Items] |  |
Short-term borrowed funds | 4,600 | 9,200
Pledged as collateral for FHLB borrowing capacity |  |
Debt Instrument [Line Items] |  |
Available borrowing capacity | $ 21,100 | $ 15,900

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