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BASIS OF PRESENTATION Operating Leases (Details) - USD ($) $ in Millions | Aug. 01, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Operating Leased Assets [Line Items] |  |  |  |
Goodwill |  |  | $ 6,946 | $ 6,887
Accounting Standards Update 2016-02 | Scenario, Forecast | Minimum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Right of use asset |  | $ 600 |  |
Operating lease liability |  | 600 |  |
Accounting Standards Update 2016-02 | Scenario, Forecast | Maximum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Right of use asset |  | 750 |  |
Operating lease liability |  | $ 750 |  |
Franklin American Mortgage Company |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Consideration transferred | $ 582 |  |  |
Goodwill | 59 |  |  |
Intangible assets acquired | 32 |  |  |
Residential mortgages | Franklin American Mortgage Company |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
MSR portfolio fair value | $ 590 |  |  |

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