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Intangible Assets - Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2008 | Dec. 31, 2007 | Sep. 30, 2019 | Sep. 30, 2018
Goodwill [Roll Forward] |  |  |  |  |
Balance at December 31, 2018 |  |  |  | $ 3,712 |
Goodwill acquired |  |  |  | 0 |
Goodwill, Impairment Loss |  |  |  | 180 |
Balance at September 30, 2019 |  |  |  | 3,532 |
Accumulated Impairment Losses | [1] |  |  |  | $ 1,966
Goodwill, Impairment Loss |  |  |  | 180 |
Real Estate Franchise Services |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at December 31, 2018 |  |  |  | 2,292 |
Goodwill acquired |  |  |  | 0 |
Goodwill, Impairment Loss |  |  |  | 0 |
Balance at September 30, 2019 |  |  |  | 2,292 |
Accumulated Impairment Losses | [1] |  |  |  | 1,023
Goodwill, Impairment Loss |  |  |  | 0 |
Company Owned Brokerage Services |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at December 31, 2018 |  |  |  | 906 |
Goodwill acquired |  |  |  | 0 |
Goodwill, Impairment Loss |  | $ 1,279 | $ 507 | 180 |
Balance at September 30, 2019 |  |  |  | 726 |
Accumulated Impairment Losses | [1] |  |  |  | 338
Goodwill, Impairment Loss |  | $ 1,279 | $ 507 | 180 |
Relocation Services |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at December 31, 2018 |  |  |  | 360 |
Goodwill acquired |  |  |  | 0 |
Goodwill, Impairment Loss |  |  |  | 0 |
Balance at September 30, 2019 |  |  |  | 360 |
Accumulated Impairment Losses | [1] |  |  |  | 281
Goodwill, Impairment Loss |  |  |  | 0 |
Title and Settlement Services |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Balance at December 31, 2018 |  |  |  | 154 |
Goodwill acquired |  |  |  | 0 |
Goodwill, Impairment Loss |  |  |  | 0 |
Balance at September 30, 2019 |  |  |  | 154 |
Accumulated Impairment Losses | [1] |  |  |  | $ 324
Goodwill, Impairment Loss |  |  |  | $ 0 |
[1] | Includes impairment charges which reduced goodwill by $180 million, $1,279 million and $507 million during the third quarter of 2019, fourth quarter of 2008 and fourth quarter of 2007, respectively.

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