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DERIVATIVE FINANCIAL INSTRUMENTS - MSR Hedging Activities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Remaining maturity | 1 year |  | 1 year |  |
Notional Value | $ 42,311 |  | $ 42,311 |  | $ 45,809
Derivative used in Mortgage Banking Activities |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Derivative, fair value, net | 3 |  | 3 |  | 7
Notional Value | 2,350 |  | 2,350 |  | 1,780
Trading liabilities | 15 |  | 15 |  | 45
Trading gains (losses) | 4 | $ 26 | 13 | $ (3) |
Commitments to sell loans |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Commitments to sell residential real estate loans | $ 1,600 |  | $ 1,600 |  | $ 869

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