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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) reporting_unit | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Goodwill [Line Items] |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  | 2 |  |
Increase in goodwill - acquisition |  |  |  | $ 59 |  |
Goodwill impairment loss |  | $ 0 | $ 0 | 0 | $ 0 |
Amortization of intangible assets |  | 1 | $ 0 | 1 | $ 0 |
Franklin American Mortgage Company |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Increase in goodwill - acquisition | $ 59 |  |  |  |  |
Intangible assets acquired | $ 32 |  |  |  |  |
Consumer Banking |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Increase in goodwill - acquisition |  |  |  | 59 |  |
Goodwill accumulated impairment loss |  | 5,900 |  | 5,900 |  | $ 5,900
Commercial Banking |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Increase in goodwill - acquisition |  |  |  | 0 |  |
Goodwill accumulated impairment loss |  | $ 50 |  | $ 50 |  | $ 50

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