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Intangible Assets - Goodwill (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Goodwill [Line Items]    
Gross goodwill as of December 31, 2015   $ 5,404
Accumulated impairment losses   (1,786)
Balance at December 31, 2015 $ 3,618 3,618
Goodwill [Roll Forward]    
Balance at December 31, 2015 3,618  
Goodwill acquired 72  
Balance at September 30, 2016 3,690  
Real Estate Franchise Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2015   3,315
Accumulated impairment losses   (1,023)
Balance at December 31, 2015 2,292 2,292
Goodwill [Roll Forward]    
Balance at December 31, 2015 2,292  
Goodwill acquired 0  
Balance at September 30, 2016 2,292  
Company Owned Brokerage Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2015   999
Accumulated impairment losses   (158)
Balance at December 31, 2015 841 841
Goodwill [Roll Forward]    
Balance at December 31, 2015 841  
Goodwill acquired 52  
Balance at September 30, 2016 893  
Relocation Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2015   641
Accumulated impairment losses   (281)
Balance at December 31, 2015 360 360
Goodwill [Roll Forward]    
Balance at December 31, 2015 360  
Goodwill acquired 0  
Balance at September 30, 2016 360  
Title and Settlement Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2015   449
Accumulated impairment losses   (324)
Balance at December 31, 2015 125 $ 125
Goodwill [Roll Forward]    
Balance at December 31, 2015 125  
Goodwill acquired 20  
Balance at September 30, 2016 $ 145