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Note 1. Basis of Presentation Business Description (Details)	Dec. 31, 2018 Countries	Dec. 31, 2018 franchisedandcompanyownedoffices	Dec. 31, 2018 Brokerage_Offices	Dec. 31, 2018 employees	Dec. 31, 2017 franchisedandcompanyownedoffices	Dec. 31, 2016 franchisedandcompanyownedoffices	Dec. 31, 2015 franchisedandcompanyownedoffices
Number of Countries in which Entity Operates \| Countries	113
Company Owned Real Estate Brokerage Services
Number of Independent Sales Associates				50,200
Number of offices		755	760		789	789	787
Worldwide \| Franchised and Company Owned
Number of Independent Sales Associates				299,400
Number of offices \| franchisedandcompanyownedoffices		16,600
United States \| Franchised and Company Owned
Number of Independent Sales Associates				191,700
Number of offices \| Brokerage_Offices			6,000