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DERIVATIVES - Amounts Recorded in Balance Sheet (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative [Line Items] |  |
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | $ (19) | $ (17)
Closed Portfolios |  |
Derivative [Line Items] |  |
Carrying amount of hedged assets | 4,800 | 4,000
Amortized cost | 6,800 | 5,900
Cumulative basis adjustment | (58) | 39
Total debt securities available for sale, at fair value |  |
Derivative [Line Items] |  |
Carrying amount of hedged assets | 9,125 | 7,253
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged assets | (74) | 60
Long-term borrowed funds |  |
Derivative [Line Items] |  |
Carrying amount of hedged liabilities | 480 | 483
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | $ (19) | $ (17)

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