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ALLOWANCE FOR LOAN AND LEASE LOSSES - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loan loss reserve | $ 1,676 | $ 1,747 | $ 922 | $ 178
Hurricane Helene |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loan loss reserve | $ 20 |  |  |

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