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COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Other Commitments [Line Items] |  |
Commitment amount | $ 78,435 | $ 76,580
Commitments to extend credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 76,200 | 74,160
Letters of credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 2,077 | 2,239
Risk participation agreements |  |
Other Commitments [Line Items] |  |
Commitment amount | 71 | 98
Loans sold with recourse |  |
Other Commitments [Line Items] |  |
Commitment amount | 58 | 54
Marketing rights |  |
Other Commitments [Line Items] |  |
Commitment amount | $ 29 | $ 29

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