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DERIVATIVES - Amounts Recorded in Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | $ (17) | $ (27)
Debt Securities |  |
Derivative [Line Items] |  |
Carrying amount of hedged assets | 7,253 | 0
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | 60 | 0
Debt Securities | Closed Portfolios |  |
Derivative [Line Items] |  |
Carrying amount of hedged assets | 5,900 |
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | 39 |
Amount of hedged item | 4,000 |
Long-term borrowed funds |  |
Derivative [Line Items] |  |
Carrying amount of hedged liabilities | 483 | 972
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | $ (17) | $ (27)

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