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Business Description (Details)	Dec. 31, 2021 employees	Dec. 31, 2021 franchisedandcompanyownedoffices	Dec. 31, 2021 Countries	Dec. 31, 2021 Brokerage_Offices	Dec. 31, 2020 franchisedandcompanyownedoffices	Dec. 31, 2019 franchisedandcompanyownedoffices	Dec. 31, 2018 franchisedandcompanyownedoffices
Number of Countries in which Entity Operates \| Countries			119
Realogy Brokerage Group
Number of Independent Sales Associates	56,300
Number of offices		675		680	673	713	755
Worldwide \| Realogy Franchise and Brokerage Groups
Number of Independent Sales Associates	333,400
Number of offices \| franchisedandcompanyownedoffices		21,000
United States \| Realogy Franchise and Brokerage Groups
Number of Independent Sales Associates	196,700
Number of offices \| Brokerage_Offices				5,800