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COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Other Commitments [Line Items] |  |
Commitment amount | $ 71,739 | $ 65,159
Undrawn commitments to extend credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 69,553 | 62,959
Letters of credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 2,125 | 2,136
Marketing rights |  |
Other Commitments [Line Items] |  |
Commitment amount | 37 | 41
Risk participation agreements |  |
Other Commitments [Line Items] |  |
Commitment amount | 19 | 16
Residential mortgage loans sold with recourse |  |
Other Commitments [Line Items] |  |
Commitment amount | $ 5 | $ 7

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