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DERIVATIVES - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | --- | ---
Derivative [Line Items] |  |  |
Notional amount | $ 305,510 |  | $ 279,484
Net loss (pre-tax) on derivatives expected to be reclassified in next 12 months | 396 |  |
Prepayable Fixed-Rate Afs Securities Portfolio |  |  |
Derivative [Line Items] |  |  |
Carrying amount of hedged assets | 4,700 |  | 4,700
Nonprepayable Fixed-Rate Afs Securities Portfolio |  |  |
Derivative [Line Items] |  |  |
Carrying amount of hedged assets | 3,600 |  | $ 3,100
Interest rate contracts | Cash Flow Hedging |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 466 | $ 1,500 |

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