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Intangible Assets - Goodwill (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 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 4  
Balance at June 30, 2017 3,694  
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 June 30, 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 4  
Balance at June 30, 2017 897  
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 June 30, 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 June 30, 2017 $ 145