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COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Other Commitments [Line Items] |  |
Commitment amount | $ 67,598 | $ 65,159
Undrawn commitments to extend credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 65,389 | 62,959
Financial standby letters of credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 1,974 | 2,036
Performance letters of credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 120 | 47
Commercial letters of credit |  |
Other Commitments [Line Items] |  |
Commitment amount | 56 | 53
Marketing rights |  |
Other Commitments [Line Items] |  |
Commitment amount | 39 | 41
Risk participation agreements |  |
Other Commitments [Line Items] |  |
Commitment amount | 14 | 16
Residential mortgage loans sold with recourse |  |
Other Commitments [Line Items] |  |
Commitment amount | $ 6 | $ 7

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