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BASIS OF PRESENTATION Narrative (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2019 | Aug. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 6,923 | $ 6,887 | $ 6,876
Purchase price allocation adjustment | [1] |  |  | 23 |  |
Franklin American Mortgage Company |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred |  |  | $ 582 |  |  |
Goodwill |  |  | 59 | 36 |  |
Intangible assets acquired |  |  | 32 | 30 |  |
Purchase price allocation adjustment |  |  |  | 23 |  |
Amortization expense |  |  |  | $ 2 |  |
Residential mortgages | Franklin American Mortgage Company |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
MSR portfolio fair value |  |  | $ 590 |  |  |
Subsequent Event | Accounting Standards Update 2016-02 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Right-of-use asset |  | $ 750 |  |  |  |
Lease liability |  | 750 |  |  |  |
Subsequent Event | Accounting Standards Update 2017-12 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Transfer of securities |  | 755 |  |  |  |
Unrealized loss on transfer of securities |  | $ 15 |  |  |  |
[1] | Adjustments to goodwill are the result of an update to the purchase price allocation for the FAMC acquisition, given higher value attributed to purchased net assets.

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