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BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Principal balance | $ 13,600 | $ 16,000
Unamortized deferred issuance costs and or discounts | 74 | 85
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | (17) | (27)
Short-term borrowed funds | 505 | 3
Available borrowing capacity | 69,000 |
FHLB advances and letters of credit | Secured Debt |  |
Debt Instrument [Line Items] |  |
Short-term borrowed funds | 9,200 | 15,700
Pledged as collateral for FHLB borrowing capacity |  |
Debt Instrument [Line Items] |  |
Available borrowing capacity | $ 15,900 | $ 11,500

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