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COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Other Commitments [Line Items] |  |
Commitment amount | $ 96,089 | $ 95,413
Commitments to extend credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 94,106 | 93,460
Letters of credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 1,875 | 1,845
Loans sold with recourse |  |
Other Commitments [Line Items] |  |
Commitment amount | 91 | 93
Marketing rights |  |
Other Commitments [Line Items] |  |
Commitment amount | 12 | 14
Risk participation agreements |  |
Other Commitments [Line Items] |  |
Commitment amount | $ 5 | $ 1

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