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Note 5. Franchising and Marketing Activities Change in the Number of Franchised and Company Owned Outlets (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2018 USD ($) Brokerage_Offices	Dec. 31, 2017 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2016 USD ($) franchisedandcompanyownedoffices
Franchised:
Change in Number of Franchised and Company Owned Outlets [Roll Forward]
Beginning balance		14,039		13,314	12,771
Additions		2,149		1,137	847
Terminations/Closures		(358)		(412)	(304)
Ending balance		15,830		14,039	13,314
Company Owned:
Change in Number of Franchised and Company Owned Outlets [Roll Forward]
Beginning balance		789		789	787
Additions		8		20	38
Terminations/Closures		(42)		(20)	(36)
Ending balance		755	760	789	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 \| $	$ 131	$ 131	$ 131	$ 124
Forgiveness of franchise conversion and development advance notes \| $	$ 29			$ 25	$ 24