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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) counterparty | Dec. 31, 2019 USD ($) | Dec. 31, 2003
Risk Participation Agreements [Abstract] |  |  |
Risk participation agreements number of counterparties | counterparty | 84 |  |
Risk participation agreements, maximum term | 9 years |  |
Commercial real estate loans held for sale | Purchase commitment |  |  |
Other Commitments [Abstract] |  |  |
Unsettled commercial loan trade purchases | $ 69 | $ 183 |
Unsettled commercial loan trade sales | $ 143 | $ 236 |
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
Financial standby letters of credit |  |  |
Letters of Credit [Abstract] |  |  |
Letters of credit outstanding, term | P10Y |  |
Commercial letters of credit |  |  |
Letters of Credit [Abstract] |  |  |
Letters of credit outstanding, term | P1Y |  |

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