Business Description (Details)	Dec. 31, 2023 numberOfIndependentSalesAgents	Dec. 31, 2023 franchisedandcompanyownedoffices	Dec. 31, 2023 Countries	Dec. 31, 2023 Brokerage_Offices	Dec. 31, 2022 franchisedandcompanyownedoffices	Dec. 31, 2021 franchisedandcompanyownedoffices	Dec. 31, 2020 franchisedandcompanyownedoffices
Number of Countries in which Entity Operates | Countries			119
Owned Brokerage Group
Number of Independent Sales Associates	56,700
Number of offices		623		620	679	675	673
Worldwide | Franchise and Owned Brokerage Groups
Number of Independent Sales Associates	322,500
Number of offices | franchisedandcompanyownedoffices		18,900
United States | Franchise and Owned Brokerage Groups
Number of Independent Sales Associates	188,300
Number of offices | Brokerage_Offices				5,600