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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  | $ 3,618 | $ 3,477 | $ 3,335 |
Goodwill acquired |  |  | 72 | 141 | 142 |
Goodwill Balance, end of period |  |  | 3,690 | 3,618 | 3,477 |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |
Gross goodwill |  |  |  |  |  | $ 5,476
Accumulated impairment losses (a) |  |  |  |  |  | (1,786)
Balance at December 31, 2016 |  |  | 3,618 | 3,477 | 3,335 | 3,690
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 | 2,241 |
Goodwill acquired |  |  | 0 | 0 | 51 |
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) |  |  |  |  |  | (1,023)
Balance at December 31, 2016 |  |  | 2,292 | 2,292 | 2,241 | 2,292
Company Owned Real Estate Brokerage Services |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  | 841 | 747 | 661 |
Goodwill acquired |  |  | 52 | 94 | 86 |
Goodwill Balance, end of period |  |  | 893 | 841 | 747 |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |
Gross goodwill |  |  |  |  |  | 1,051
Accumulated impairment losses (a) |  |  |  |  |  | (158)
Balance at December 31, 2016 |  |  | 841 | 747 | 661 | 893
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) |  |  |  |  |  | (281)
Balance at December 31, 2016 |  |  | 360 | 360 | 360 | 360
Title and Settlement Services |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  | 125 | 78 | 73 |
Goodwill acquired |  |  | 20 | 47 | 5 |
Goodwill Balance, end of period |  |  | 145 | 125 | 78 |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |
Gross goodwill |  |  |  |  |  | 469
Accumulated impairment losses (a) |  |  |  |  |  | (324)
Balance at December 31, 2016 |  |  | $ 125 | $ 78 | $ 73 | $ 145

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