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NONINTEREST INCOME - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Trust and investment services fees |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Trailing commission income | $ 15 | $ 15 | $ 16

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