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GOODWILL - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) reporting_unit | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Goodwill [Line Items] |  |  |  |  |
Number of reporting units | reporting_unit |  |  | 2 |  |
Goodwill acquired |  |  | $ 6 |  |
Goodwill impairment loss | $ 0 | $ 0 | 0 | $ 0 |
Amortization of intangibles |  |  | 6 | $ 5 |
Consumer Banking |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill acquired |  |  | 0 |  |
Goodwill accumulated impairment loss | 5,900 |  | 5,900 |  | $ 5,900
Commercial Banking |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill acquired |  |  | 6 |  |
Goodwill accumulated impairment loss | $ 50 |  | $ 50 |  | $ 50

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