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NONINTEREST INCOME - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Wealth fees |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Trailing commission income | $ 4 | $ 4 | $ 12 | $ 11

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