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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, 2017 USD ($)	Dec. 31, 2017 USD ($) Brokerage_Offices	Dec. 31, 2017 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2016 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2015 USD ($) franchisedandcompanyownedoffices
Franchised:
Change in Number of Franchised and Company Owned Outlets [Roll Forward]
Beginning balance			13,314	12,771	12,769
Additions			1,137	847	445
Terminations/Closures			(412)	(304)	(443)
Ending balance			14,039	13,314	12,771
Company Owned:
Change in Number of Franchised and Company Owned Outlets [Roll Forward]
Beginning balance			789	787	727
Additions			20	38	74
Terminations/Closures			(20)	(36)	(14)
Ending balance		790	789	789	787
Franchisee Conversion Notes and Development Advance Notes
Change in Number of Franchised and Company Owned Outlets [Roll Forward]
Franchise conversion and development advance notes | $	$ 124	$ 124	$ 124	$ 123
Allowance for franchise conversion and development advance notes | $	1	$ 1	$ 1	1
Forgiveness of franchise conversion and development advance notes | $	$ 25			$ 24	$ 22

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Change in Number of Franchised and Company Owned Outlets [Roll Forward]

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The number of offices.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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