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Intangible Assets - Goodwill (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2008
Dec. 31, 2007
Sep. 30, 2019
Sep. 30, 2018
Goodwill [Roll Forward]        
Balance at December 31, 2018     $ 3,712  
Goodwill acquired     0  
Goodwill, Impairment Loss     180  
Balance at September 30, 2019     3,532  
Accumulated Impairment Losses [1]       $ 1,966
Goodwill, Impairment Loss     180  
Real Estate Franchise Services        
Goodwill [Roll Forward]        
Balance at December 31, 2018     2,292  
Goodwill acquired     0  
Goodwill, Impairment Loss     0  
Balance at September 30, 2019     2,292  
Accumulated Impairment Losses [1]       1,023
Goodwill, Impairment Loss     0  
Company Owned Brokerage Services        
Goodwill [Roll Forward]        
Balance at December 31, 2018     906  
Goodwill acquired     0  
Goodwill, Impairment Loss $ 1,279 $ 507 180  
Balance at September 30, 2019     726  
Accumulated Impairment Losses [1]       338
Goodwill, Impairment Loss $ 1,279 $ 507 180  
Relocation Services        
Goodwill [Roll Forward]        
Balance at December 31, 2018     360  
Goodwill acquired     0  
Goodwill, Impairment Loss     0  
Balance at September 30, 2019     360  
Accumulated Impairment Losses [1]       281
Goodwill, Impairment Loss     0  
Title and Settlement Services        
Goodwill [Roll Forward]        
Balance at December 31, 2018     154  
Goodwill acquired     0  
Goodwill, Impairment Loss     0  
Balance at September 30, 2019     154  
Accumulated Impairment Losses [1]       $ 324
Goodwill, Impairment Loss     $ 0  
[1] Includes impairment charges which reduced goodwill by $180 million, $1,279 million and $507 million during the third quarter of 2019, fourth quarter of 2008 and fourth quarter of 2007, respectively.