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DERIVATIVE FINANCIAL INSTRUMENTS - Gain (Loss) (Details) - Derivatives not designated as Hedging Instruments - Fair Value Hedges - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivative | $ 36 | $ 38 | $ 80 | $ 38
Interest rate contracts | Capital markets and advisory fees |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivative | 13 | 17 | 34 | 28
Interest rate contracts | Mortgage banking income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivative | 9 | 28 | 9 | 5
Foreign exchange contracts | Capital markets and advisory fees |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivative | 13 | 11 | 37 | 33
Credit contracts | Other noninterest income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivative | (2) | (6) | (6) | (14)
Commodities contracts | Capital markets and advisory fees |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivative | 0 | 1 | 2 | 3
Equity contracts | Other noninterest income and other noninterest expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Income on Derivative | $ 3 | $ (13) | $ 4 | $ (17)

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