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Intangible Assets - Goodwill (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]    
Gross goodwill as of December 31, 2018   $ 5,498
Accumulated impairment losses   (1,786)
Balance at December 31, 2018 $ 3,712 3,712
Goodwill [Roll Forward]    
Balance at December 31, 2018 3,712  
Goodwill acquired 0  
Balance at March 31, 2019 3,712  
Real Estate Franchise Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2018   3,315
Accumulated impairment losses   (1,023)
Balance at December 31, 2018 2,292 2,292
Goodwill [Roll Forward]    
Balance at December 31, 2018 2,292  
Goodwill acquired 0  
Balance at March 31, 2019 2,292  
Company Owned Brokerage Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2018   1,064
Accumulated impairment losses   (158)
Balance at December 31, 2018 906 906
Goodwill [Roll Forward]    
Balance at December 31, 2018 906  
Goodwill acquired 0  
Balance at March 31, 2019 906  
Relocation Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2018   641
Accumulated impairment losses   (281)
Balance at December 31, 2018 360 360
Goodwill [Roll Forward]    
Balance at December 31, 2018 360  
Goodwill acquired 0  
Balance at March 31, 2019 360  
Title and Settlement Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2018   478
Accumulated impairment losses   (324)
Balance at December 31, 2018 154 $ 154
Goodwill [Roll Forward]    
Balance at December 31, 2018 154  
Goodwill acquired 0  
Balance at March 31, 2019 $ 154