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COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Other Commitments [Line Items] |  |
Commitment amount | $ 96,608 | $ 96,295
Commitments to extend credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 94,436 | 94,201
Letters of credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 2,055 | 1,977
Loans sold with recourse |  |
Other Commitments [Line Items] |  |
Commitment amount | 99 | 96
Marketing rights |  |
Other Commitments [Line Items] |  |
Commitment amount | 17 | 18
Risk participation agreements |  |
Other Commitments [Line Items] |  |
Commitment amount | $ 1 | $ 3

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