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DERIVATIVES - Amounts Recorded in Balance Sheet (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Derivative [Line Items] |  |
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | $ (1) | $ (8)
Closed Portfolios |  |
Derivative [Line Items] |  |
Amortized cost | 6,000 | 6,400
Cumulative basis adjustment | 37 | (75)
Nonprepayable Fixed-Rate Afs Securities Portfolio |  |
Derivative [Line Items] |  |
Carrying amount of hedged assets | 3,600 | 3,100
Prepayable Fixed-Rate Afs Securities Portfolio |  |
Derivative [Line Items] |  |
Carrying amount of hedged assets | 4,700 | 4,700
Total debt securities available for sale, at fair value |  |
Derivative [Line Items] |  |
Carrying amount of hedged assets | 9,728 | 9,557
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged assets | 83 | (97)
Long-term borrowed funds |  |
Derivative [Line Items] |  |
Carrying amount of hedged liabilities | 499 | 491
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | $ (1) | $ (8)

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