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Goodwill (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
real_estate_brokerage_operations
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2007
USD ($)
Goodwill [Roll Forward]            
Balance at December 31, 2020 $ 2,910          
Goodwill, Acquired During Period [1] 2          
Goodwill, Written off Related to Sale of Business Unit [2] (3)          
Balance at March 31, 2021 2,909   $ 2,910      
Accumulated Impairment Losses [3] 2,579          
Impairment Loss     540 $ 253 $ 1,279 $ 507
Realogy Franchise Group            
Goodwill [Roll Forward]            
Balance at December 31, 2020 2,509          
Goodwill, Acquired During Period [1] 0          
Goodwill, Written off Related to Sale of Business Unit [2] (3)          
Balance at March 31, 2021 2,506   2,509      
Accumulated Impairment Losses [3] 1,447          
Realogy Brokerage Group            
Goodwill [Roll Forward]            
Balance at December 31, 2020 245          
Goodwill, Acquired During Period [1] 0          
Goodwill, Written off Related to Sale of Business Unit [2] 0          
Balance at March 31, 2021 245   245      
Accumulated Impairment Losses [3] 808          
Impairment Loss   $ 413        
Realogy Title Group            
Goodwill [Roll Forward]            
Balance at December 31, 2020 156          
Goodwill, Acquired During Period [1] 2          
Goodwill, Written off Related to Sale of Business Unit [2] 0          
Balance at March 31, 2021 158   $ 156      
Accumulated Impairment Losses [3] $ 324          
Number of Businesses Acquired | real_estate_brokerage_operations 1          
[1] Goodwill acquired during the three months ended March 31, 2021 relates to the acquisition of one title and settlement operation.
[2] Goodwill reduction during the three months ended March 31, 2021 relates to the sale of a relocation related business.
[3] Includes impairment charges which reduced goodwill by $540 million during 2020, $253 million during 2019, $1,279 million during 2008 and $507 million during 2007.