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Intangible Assets - Goodwill (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Goodwill [Line Items]    
Gross goodwill as of December 31, 2014   $ 5,263
Accumulated impairment losses   (1,786)
Balance at December 31, 2014 $ 3,477 3,477
Goodwill [Roll Forward]    
Balance at December 31, 2014 3,477  
Goodwill acquired 126  
Balance at September 30, 2015 3,603  
Real Estate Franchise Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2014   3,315
Accumulated impairment losses   (1,023)
Balance at December 31, 2014 2,292 2,292
Goodwill [Roll Forward]    
Balance at December 31, 2014 2,292  
Goodwill acquired 0  
Balance at September 30, 2015 2,292  
Company Owned Brokerage Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2014   905
Accumulated impairment losses   (158)
Balance at December 31, 2014 747 747
Goodwill [Roll Forward]    
Balance at December 31, 2014 747  
Goodwill acquired 79  
Balance at September 30, 2015 826  
Relocation Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2014   641
Accumulated impairment losses   (281)
Balance at December 31, 2014 360 360
Goodwill [Roll Forward]    
Balance at December 31, 2014 360  
Goodwill acquired 0  
Balance at September 30, 2015 360  
Title and Settlement Services    
Goodwill [Line Items]    
Gross goodwill as of December 31, 2014   402
Accumulated impairment losses   (324)
Balance at December 31, 2014 78 $ 78
Goodwill [Roll Forward]    
Balance at December 31, 2014 78  
Goodwill acquired 47  
Balance at September 30, 2015 $ 125