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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 04, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) reportingUnit | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Goodwill [Line Items] |  |  |  |  |
Number of reporting units | reportingUnit |  |  | 2 |  |
Goodwill impairment |  | $ 0 | $ 0 | $ 0 | $ 0
Amortization of intangibles |  |  | 11,000,000 | 11,000,000 | $ 3,000,000
Consumer Banking |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill accumulated impairment loss |  | 5,900,000,000 | 5,900,000,000 | 5,900,000,000 |
Commercial Banking |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill acquired during period | $ 6,000,000 |  |  |  |
Goodwill accumulated impairment loss |  | $ 50,000,000 | $ 50,000,000 | $ 50,000,000 |

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