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Intangible Assets - Goodwill (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) real_estate_brokerage_operations | Dec. 31, 2017 USD ($)
Goodwill [Line Items] |  |  |
Gross goodwill as of December 31, 2017 |  |  | $ 5,496
Accumulated impairment losses |  |  | (1,786)
Balance at December 31, 2017 |  | $ 3,710 | 3,710
Goodwill [Roll Forward] |  |  |
Balance at December 31, 2017 |  | 3,710 |
Goodwill acquired (a) | [1] | 2 |
Balance at September 30, 2018 |  | 3,712 |
Real Estate Franchise Services |  |  |
Goodwill [Line Items] |  |  |
Gross goodwill as of December 31, 2017 |  |  | 3,315
Accumulated impairment losses |  |  | (1,023)
Balance at December 31, 2017 |  | 2,292 | 2,292
Goodwill [Roll Forward] |  |  |
Balance at December 31, 2017 |  | 2,292 |
Goodwill acquired (a) | [1] | 0 |
Balance at September 30, 2018 |  | 2,292 |
Company Owned Real Estate Brokerage Services |  |  |
Goodwill [Line Items] |  |  |
Gross goodwill as of December 31, 2017 |  |  | 1,062
Accumulated impairment losses |  |  | (158)
Balance at December 31, 2017 |  | 904 | 904
Goodwill [Roll Forward] |  |  |
Balance at December 31, 2017 |  | 904 |
Goodwill acquired (a) | [1] | 2 |
Balance at September 30, 2018 |  | $ 906 |
Number of Businesses Acquired | real_estate_brokerage_operations |  | 3 |
Relocation Services |  |  |
Goodwill [Line Items] |  |  |
Gross goodwill as of December 31, 2017 |  |  | 641
Accumulated impairment losses |  |  | (281)
Balance at December 31, 2017 |  | $ 360 | 360
Goodwill [Roll Forward] |  |  |
Balance at December 31, 2017 |  | 360 |
Goodwill acquired (a) | [1] | 0 |
Balance at September 30, 2018 |  | 360 |
Title and Settlement Services |  |  |
Goodwill [Line Items] |  |  |
Gross goodwill as of December 31, 2017 |  |  | 478
Accumulated impairment losses |  |  | (324)
Balance at December 31, 2017 |  | 154 | $ 154
Goodwill [Roll Forward] |  |  |
Balance at December 31, 2017 |  | 154 |
Goodwill acquired (a) | [1] | 0 |
Balance at September 30, 2018 |  | $ 154 |
[1] | Goodwill acquired during the nine months ended September 30, 2018 relates to the acquisition of three real estate brokerage operations.

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