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Intangible Assets - Goodwill (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2014 |  | $ 5,263
Accumulated impairment losses |  | (1,786)
Balance at December 31, 2014 | $ 3,477 | 3,477
Goodwill [Roll Forward] |  |
Balance at December 31, 2014 | 3,477 |
Goodwill acquired | 126 |
Balance at September 30, 2015 | 3,603 |
Real Estate Franchise Services |  |
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2014 |  | 3,315
Accumulated impairment losses |  | (1,023)
Balance at December 31, 2014 | 2,292 | 2,292
Goodwill [Roll Forward] |  |
Balance at December 31, 2014 | 2,292 |
Goodwill acquired | 0 |
Balance at September 30, 2015 | 2,292 |
Company Owned Brokerage Services |  |
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2014 |  | 905
Accumulated impairment losses |  | (158)
Balance at December 31, 2014 | 747 | 747
Goodwill [Roll Forward] |  |
Balance at December 31, 2014 | 747 |
Goodwill acquired | 79 |
Balance at September 30, 2015 | 826 |
Relocation Services |  |
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2014 |  | 641
Accumulated impairment losses |  | (281)
Balance at December 31, 2014 | 360 | 360
Goodwill [Roll Forward] |  |
Balance at December 31, 2014 | 360 |
Goodwill acquired | 0 |
Balance at September 30, 2015 | 360 |
Title and Settlement Services |  |
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2014 |  | 402
Accumulated impairment losses |  | (324)
Balance at December 31, 2014 | 78 | $ 78
Goodwill [Roll Forward] |  |
Balance at December 31, 2014 | 78 |
Goodwill acquired | 47 |
Balance at September 30, 2015 | $ 125 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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