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COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Other Commitments [Line Items] |  |
Commitment amount | $ 102,680 | $ 95,413
Commitments to extend credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 100,650 | 93,460
Letters of credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 1,901 | 1,845
Loans sold with recourse |  |
Other Commitments [Line Items] |  |
Commitment amount | 89 | 93
Risk participation agreements |  |
Other Commitments [Line Items] |  |
Commitment amount | 29 | 1
Other commitments |  |
Other Commitments [Line Items] |  |
Commitment amount | $ 11 | $ 14

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