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BORROWED FUNDS - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Principal balance | $ 13,900 | $ 13,600
Unamortized deferred issuance costs and/or discounts | 75 | 74
Hedging basis adjustments | (19) | (17)
Short-term borrowed funds | 9 | 505
Available borrowing capacity | 70,600 |
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt |  |
Debt Instrument [Line Items] |  |
Short-term borrowed funds | 6,000 | 9,200
Federal Home Loan Bank advances |  |
Debt Instrument [Line Items] |  |
Available borrowing capacity | $ 18,700 | $ 15,900

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