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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) $ in Millions | 12 Months Ended | 372 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) reporting_unit | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) business | Aug. 01, 2018 USD ($)
Goodwill [Line Items] |  |  |  |  |
Number of reporting units | reporting_unit | 2 |  |  |  |
Number of acquisitions of banks or assets of banks | business |  |  |  | 25 |
Goodwill acquired during period | $ 36 |  |  |  |
Goodwill impairment | 0 | $ 0 | $ 0 |  |
Amortization of intangible assets | 3 | 0 | $ 0 |  |
Consumer Banking |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill accumulated impairment loss | 5,900 | 5,900 |  | $ 5,900 |
Commercial Banking |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill accumulated impairment loss | 50 | $ 50 |  | 50 |
Franklin American Mortgage Company |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Intangible assets acquired | 30 |  |  | 30 | $ 32
Amortization expense | $ 2 |  |  | $ 2 |

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