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COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Other Commitments [Line Items] |  |
Commitment amount | $ 67,077 | $ 75,040
Commitments to extend credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 64,827 | 72,743
Letters of credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 2,064 | 2,190
Risk participation agreements |  |
Other Commitments [Line Items] |  |
Commitment amount | 106 | 37
Loans sold with recourse |  |
Other Commitments [Line Items] |  |
Commitment amount | 49 | 37
Marketing rights |  |
Other Commitments [Line Items] |  |
Commitment amount | $ 31 | $ 33

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