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Business Description (Details)
Dec. 31, 2020
employees
Dec. 31, 2020
franchisedandcompanyownedoffices
Dec. 31, 2020
Countries
Dec. 31, 2020
Brokerage_Offices
Dec. 31, 2019
franchisedandcompanyownedoffices
Dec. 31, 2018
franchisedandcompanyownedoffices
Dec. 31, 2017
franchisedandcompanyownedoffices
Number of Countries in which Entity Operates | Countries     116        
Realogy Brokerage Group              
Number of Independent Sales Associates 53,100            
Number of offices   673   670 713 755 789
Worldwide | Realogy Franchise and Brokerage Groups              
Number of Independent Sales Associates 320,700            
Number of offices | franchisedandcompanyownedoffices   20,100          
United States | Realogy Franchise and Brokerage Groups              
Number of Independent Sales Associates 190,700            
Number of offices | Brokerage_Offices       5,800