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Goodwill (Details) - USD ($)
 3 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Dec. 31, 2008
Dec. 31, 2007
Goodwill [Roll Forward]        
Balance at December 31, 2019 $ 3,300,000,000      
Goodwill acquired 0      
Goodwill, Impairment Loss (413,000,000) $ (237) $ (1,153) $ (489)
Balance at March 31, 2020 2,887,000,000      
Accumulated Impairment Losses [1] 2,292,000,000      
Goodwill, Impairment Loss (413,000,000) $ (237) $ (1,153) $ (489)
Realogy Franchise Group        
Goodwill [Roll Forward]        
Balance at December 31, 2019 2,476,000,000      
Goodwill acquired 0      
Goodwill, Impairment Loss 0      
Balance at March 31, 2020 2,476,000,000      
Accumulated Impairment Losses [1] 1,160,000,000      
Goodwill, Impairment Loss 0      
Realogy Brokerage Group        
Goodwill [Roll Forward]        
Balance at December 31, 2019 669,000,000      
Goodwill acquired 0      
Goodwill, Impairment Loss (413,000,000)      
Balance at March 31, 2020 256,000,000      
Accumulated Impairment Losses [1] 808,000,000      
Goodwill, Impairment Loss (413,000,000)      
Realogy Title Group        
Goodwill [Roll Forward]        
Balance at December 31, 2019 155,000,000      
Goodwill acquired 0      
Goodwill, Impairment Loss 0      
Balance at March 31, 2020 155,000,000      
Accumulated Impairment Losses [1] 324,000,000      
Goodwill, Impairment Loss $ 0      
[1] Includes impairment charges which reduced goodwill by $413 million, $237 million, $1,153 million and $489 million during the first quarter of 2020, third quarter of 2019, fourth quarter of 2008 and fourth quarter of 2007, respectively.