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COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Other Commitments [Line Items] |  |
Commitment amount | $ 75,040 | $ 71,739
Undrawn commitments to extend credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 72,743 | 69,553
Letters of credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 2,190 | 2,125
Risk participation agreements |  |
Other Commitments [Line Items] |  |
Commitment amount | 37 | 19
Loans sold with recourse |  |
Other Commitments [Line Items] |  |
Commitment amount | 37 | 5
Marketing rights |  |
Other Commitments [Line Items] |  |
Commitment amount | $ 33 | $ 37

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