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Franchising and Marketing Activities Change in the Number of Franchised and Brokerage Outlets (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2024 USD ($) Brokerage_Offices	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2022 USD ($) franchisedandcompanyownedoffices
Franchisee Conversion Notes and Development Advance Notes
Change in Number of Franchised and Company Owned Outlets [Roll Forward]
Franchise conversion and development advance notes \| $	$ 164	$ 164	$ 164	$ 174
Forgiveness of Franchise Conversion and Development Advance Notes, Charge to Operations \| $			$ (35)	$ (34)	$ (45)
Franchise Group
Change in Number of Franchised and Company Owned Outlets [Roll Forward]
Beginning balance	18,303			19,824	20,355
Additions	403			571	548
Terminations/Closures	(1,501)			(2,092)	(1,079)
Ending balance	17,205			18,303	19,824
Owned Brokerage Group
Change in Number of Franchised and Company Owned Outlets [Roll Forward]
Beginning balance	623			679	675
Additions	1			5	46
Terminations/Closures	(49)			(61)	(42)
Ending balance	575	580		623	679