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Note 4. Intangible Assets Goodwill (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2008
USD ($)
Dec. 31, 2007
USD ($)
Dec. 31, 2018
USD ($)
real_estate_brokerage_operations
Dec. 31, 2017
USD ($)
real_estate_brokerage_operations
Dec. 31, 2016
USD ($)
real_estate_brokerage_operations
Dec. 31, 2018
USD ($)
Goodwill [Roll Forward]            
Goodwill Balance, beginning of period     $ 3,710 $ 3,690 $ 3,618  
Goodwill acquired     2 [1] 20 [2] 72 [3]  
Goodwill Balance, end of period     3,712 3,710 3,690  
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]            
Gross goodwill           $ 5,498
Accumulated impairment losses (d) [4]           (1,786)
Balance at December 31, 2018     3,710 3,690 3,618 3,712
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 2,292  
Goodwill acquired     0 [1] 0 [2] 0 [3]  
Goodwill Balance, end of period     2,292 2,292 2,292  
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]            
Gross goodwill           3,315
Accumulated impairment losses (d) [4]           (1,023)
Balance at December 31, 2018     $ 2,292 $ 2,292 $ 2,292 2,292
Company Owned Real Estate Brokerage Services            
Goodwill [Line Items]            
Number of Businesses Acquired | real_estate_brokerage_operations     3 16 11  
Goodwill [Roll Forward]            
Goodwill Balance, beginning of period     $ 904 $ 893 $ 841  
Goodwill acquired     2 [1] 11 [2] 52 [3]  
Goodwill Balance, end of period     906 904 893  
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]            
Gross goodwill           1,064
Accumulated impairment losses (d) [4]           (158)
Balance at December 31, 2018     904 893 841 906
Relocation Services            
Goodwill [Roll Forward]            
Goodwill Balance, beginning of period     360 360 360  
Goodwill acquired     0 [1] 0 [2] 0 [3]  
Goodwill Balance, end of period     360 360 360  
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]            
Gross goodwill           641
Accumulated impairment losses (d) [4]           (281)
Balance at December 31, 2018     360 $ 360 $ 360 360
Title and Settlement Services            
Goodwill [Line Items]            
Number of Businesses Acquired | real_estate_brokerage_operations       2 1  
Goodwill [Roll Forward]            
Goodwill Balance, beginning of period     154 $ 145 $ 125  
Goodwill acquired     0 [1] 9 [2] 20 [3]  
Goodwill Balance, end of period     154 154 145  
Goodwill, Impaired, Accumulated Impairment Loss [Abstract]            
Gross goodwill           478
Accumulated impairment losses (d) [4]           (324)
Balance at December 31, 2018     $ 154 $ 145 $ 125 $ 154
[1] Goodwill acquired during the year ended December 31, 2018 relates to the acquisition of three real estate brokerage operations.
[2] Goodwill acquired during the year ended December 31, 2017 relates to the acquisition of sixteen real estate brokerage operations and two title and settlement operations.
[3] Goodwill acquired during the year ended December 31, 2016 relates to the acquisition of eleven real estate brokerage operations and one title and settlement operation.
[4] During the fourth quarter of 2008 and 2007 the Company recorded impairment charges, which reduced goodwill by $1,279 million and $507 million, respectively. No goodwill or unamortized intangible asset impairments have been recorded since 2008.