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Note 4. Intangible Assets Goodwill (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2008
Dec. 31, 2007
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Goodwill [Roll Forward]            
Goodwill Balance, beginning of period     $ 3,618 $ 3,477 $ 3,335  
Goodwill acquired     72 141 142  
Goodwill Balance, end of period     3,690 3,618 3,477  
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]            
Gross goodwill           $ 5,476
Accumulated impairment losses (a)           (1,786)
Balance at December 31, 2016     3,618 3,477 3,335 3,690
Goodwill and Intangible Asset Impairment [Abstract]            
Impairment of Goodwill $ 1,279 $ 507        
Real Estate Franchise Services            
Goodwill [Roll Forward]            
Goodwill Balance, beginning of period     2,292 2,292 2,241  
Goodwill acquired     0 0 51  
Goodwill Balance, end of period     2,292 2,292 2,292  
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]            
Gross goodwill           3,315
Accumulated impairment losses (a)           (1,023)
Balance at December 31, 2016     2,292 2,292 2,241 2,292
Company Owned Real Estate Brokerage Services            
Goodwill [Roll Forward]            
Goodwill Balance, beginning of period     841 747 661  
Goodwill acquired     52 94 86  
Goodwill Balance, end of period     893 841 747  
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]            
Gross goodwill           1,051
Accumulated impairment losses (a)           (158)
Balance at December 31, 2016     841 747 661 893
Relocation Services            
Goodwill [Roll Forward]            
Goodwill Balance, beginning of period     360 360 360  
Goodwill acquired     0 0 0  
Goodwill Balance, end of period     360 360 360  
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]            
Gross goodwill           641
Accumulated impairment losses (a)           (281)
Balance at December 31, 2016     360 360 360 360
Title and Settlement Services            
Goodwill [Roll Forward]            
Goodwill Balance, beginning of period     125 78 73  
Goodwill acquired     20 47 5  
Goodwill Balance, end of period     145 125 78  
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]            
Gross goodwill           469
Accumulated impairment losses (a)           (324)
Balance at December 31, 2016     $ 125 $ 78 $ 73 $ 145