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Intangible Assets - Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2016 |  | $ 5,476
Accumulated impairment losses |  | (1,786)
Balance at December 31, 2016 | $ 3,690 | 3,690
Goodwill [Roll Forward] |  |
Balance at December 31, 2016 | 3,690 |
Goodwill acquired | 1 |
Balance at March 31, 2017 | 3,691 |
Real Estate Franchise Services |  |
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2016 |  | 3,315
Accumulated impairment losses |  | (1,023)
Balance at December 31, 2016 | 2,292 | 2,292
Goodwill [Roll Forward] |  |
Balance at December 31, 2016 | 2,292 |
Goodwill acquired | 0 |
Balance at March 31, 2017 | 2,292 |
Company Owned Brokerage Services |  |
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2016 |  | 1,051
Accumulated impairment losses |  | (158)
Balance at December 31, 2016 | 893 | 893
Goodwill [Roll Forward] |  |
Balance at December 31, 2016 | 893 |
Goodwill acquired | 1 |
Balance at March 31, 2017 | 894 |
Relocation Services |  |
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2016 |  | 641
Accumulated impairment losses |  | (281)
Balance at December 31, 2016 | 360 | 360
Goodwill [Roll Forward] |  |
Balance at December 31, 2016 | 360 |
Goodwill acquired | 0 |
Balance at March 31, 2017 | 360 |
Title and Settlement Services |  |
Goodwill [Line Items] |  |
Gross goodwill as of December 31, 2016 |  | 469
Accumulated impairment losses |  | (324)
Balance at December 31, 2016 | 145 | $ 145
Goodwill [Roll Forward] |  |
Balance at December 31, 2016 | 145 |
Goodwill acquired | 0 |
Balance at March 31, 2017 | $ 145 |

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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 -Subparagraph (a) -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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