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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) counterparty | Dec. 31, 2017 USD ($) | Dec. 31, 2003
Letters of Credit [Abstract] |  |  |
Letters of credit outstanding, amount | $ 2 | $ 3 |
Risk Participation Agreements [Abstract] |  |  |
Risk participation agreements | $ 14 | 16 |
Risk participation agreements number of counterparties | counterparty | 87 |  |
Risk participation agreements, Maximum term | 10 years |  |
Commercial real estate loans held for sale | Purchase commitment |  |  |
Other Commitments [Abstract] |  |  |
Unsettled commercial loan trade purchases | $ 87 | 65 |
Unsettled commercial loan trade sales | $ 121 | 132 |
Minimum |  |  |
Risk Participation Agreements [Abstract] |  |  |
Risk participation agreements, Average term | 1 year |  |
Maximum |  |  |
Risk Participation Agreements [Abstract] |  |  |
Risk participation agreements, Average term | 5 years |  |
Marketing rights |  |  |
Marketing Rights [Abstract] |  |  |
Commitment period |  |  | 25 years
Payments made | $ 4 | $ 3 |
Remaining obligation due | $ 37 |  |
Financial standby letters of credit |  |  |
Letters of Credit [Abstract] |  |  |
Letters of credit outstanding | 10 years |  |
Commercial letters of credit |  |  |
Letters of Credit [Abstract] |  |  |
Letters of credit outstanding | 1 year |  |
Purchase Of Education Loans |  |  |
Other Commitments [Abstract] |  |  |
Remaining maximum purchase commitment | $ 188 |  |
Termination fee | 1 |  |
Purchase Of Education Loans | Minimum |  |  |
Other Commitments [Abstract] |  |  |
Commitment amount | 425 |  |
Purchase Of Education Loans | Maximum |  |  |
Other Commitments [Abstract] |  |  |
Commitment amount | $ 700 |  |

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