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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, 2019 USD ($) Brokerage_Offices	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2018 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2017 USD ($) franchisedandcompanyownedoffices
Franchised (domestic and international):
Change in Number of Franchised and Company Owned Outlets [Roll Forward]
Beginning balance			15,830	14,039	13,314
Additions			2,399	2,149	1,137
Terminations/Closures			(453)	(358)	(412)
Ending balance			17,776	15,830	14,039
Company owned:
Change in Number of Franchised and Company Owned Outlets [Roll Forward]
Beginning balance			755	789	789
Additions			4	8	20
Terminations/Closures			(46)	(42)	(20)
Ending balance	710		713	755	789
Franchisee Conversion Notes and Development Advance Notes
Change in Number of Franchised and Company Owned Outlets [Roll Forward]
Franchise conversion and development advance notes \| $	$ 134	$ 134	$ 134	$ 131
Forgiveness of franchise conversion and development advance notes \| $		$ 29		$ 29	$ 25