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Note 4. Intangible Assets Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2008 | Dec. 31, 2007 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  |  | $ 3,690 | $ 3,618 | $ 3,477 |
Goodwill acquired |  |  |  | 20 | 72 | 141 |
Goodwill Balance, end of period |  |  |  | 3,710 | 3,690 | 3,618 |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |
Gross goodwill |  |  |  |  |  |  | $ 5,496
Accumulated impairment losses (a) | [1] |  |  |  |  |  | (1,786)
Balance at December 31, 2017 |  |  |  | 3,690 | 3,618 | 3,477 | 3,710
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |
Impairment of Goodwill |  | $ 1,279 | $ 507 |  |  |  |
Real Estate Franchise Services |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  |  | 2,292 | 2,292 | 2,292 |
Goodwill acquired |  |  |  | 0 | 0 | 0 |
Goodwill Balance, end of period |  |  |  | 2,292 | 2,292 | 2,292 |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |
Gross goodwill |  |  |  |  |  |  | 3,315
Accumulated impairment losses (a) | [1] |  |  |  |  |  | (1,023)
Balance at December 31, 2017 |  |  |  | 2,292 | 2,292 | 2,292 | 2,292
Company Owned Real Estate Brokerage Services |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  |  | 893 | 841 | 747 |
Goodwill acquired |  |  |  | 11 | 52 | 94 |
Goodwill Balance, end of period |  |  |  | 904 | 893 | 841 |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |
Gross goodwill |  |  |  |  |  |  | 1,062
Accumulated impairment losses (a) | [1] |  |  |  |  |  | (158)
Balance at December 31, 2017 |  |  |  | 893 | 841 | 747 | 904
Relocation Services |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  |  | 360 | 360 | 360 |
Goodwill acquired |  |  |  | 0 | 0 | 0 |
Goodwill Balance, end of period |  |  |  | 360 | 360 | 360 |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |
Gross goodwill |  |  |  |  |  |  | 641
Accumulated impairment losses (a) | [1] |  |  |  |  |  | (281)
Balance at December 31, 2017 |  |  |  | 360 | 360 | 360 | 360
Title and Settlement Services |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  |  | 145 | 125 | 78 |
Goodwill acquired |  |  |  | 9 | 20 | 47 |
Goodwill Balance, end of period |  |  |  | 154 | 145 | 125 |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |
Gross goodwill |  |  |  |  |  |  | 478
Accumulated impairment losses (a) | [1] |  |  |  |  |  | (324)
Balance at December 31, 2017 |  |  |  | $ 145 | $ 125 | $ 78 | $ 154
[1] | During the fourth quarter of 2008 and 2007 the Company recorded impairment charges, which reduced goodwill by $1,279 million and $507 million, respectively. No goodwill or unamortized intangible asset impairments have been recorded since 2008.

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