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Note 5. Franchising and Marketing Activities Franchising and Marketing Activities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) Brokerage_Offices	Dec. 31, 2016 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2015 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2017 franchisedandcompanyownedoffices	Dec. 31, 2014 franchisedandcompanyownedoffices
Franchisor Disclosure [Line Items]
Initial franchise and area development fees | $	$ 8	$ 8	$ 8
Annual volume incentives from Real Estate Franchisees | $	62	56	51
Brand Marketing Fund Revenue | $	87	$ 83	$ 83
Franchised:
Franchisor Disclosure [Line Items]
Number of offices		13,314	12,771	14,039	12,769
Franchised: | Century 21®
Franchisor Disclosure [Line Items]
Number of offices		7,330	6,897	7,973
Franchised: | ERA®
Franchisor Disclosure [Line Items]
Number of offices		2,347	2,355	2,298
Franchised: | Coldwell Banker®
Franchisor Disclosure [Line Items]
Number of offices		2,289	2,258	2,330
Franchised: | Coldwell Banker Commercial®
Franchisor Disclosure [Line Items]
Number of offices		180	163	180
Franchised: | Sotheby’s International Realty®
Franchisor Disclosure [Line Items]
Number of offices		836	794	905
Franchised: | Better Homes and Gardens® Real Estate
Franchisor Disclosure [Line Items]
Number of offices		332	304	353
Company Owned:
Franchisor Disclosure [Line Items]
Royalty expense | $	299	$ 282	$ 284
Marketing and Advertising Expense | $	$ 12	$ 11	$ 11
Number of offices	790	789	787	789	727
Company Owned: | Coldwell Banker®
Franchisor Disclosure [Line Items]
Number of offices		708	708	707
Company Owned: | Sotheby’s International Realty®
Franchisor Disclosure [Line Items]
Number of offices		41	41	41
Company Owned: | Corcoran Other
Franchisor Disclosure [Line Items]
Number of offices		40	38	41

X

- Definition

Amount of annual volume incentives provided to real estate franchisees

+ References

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- Definition

Brand Marketing Fund Revenue

+ References

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X

- Definition

Amount of domestic initial franchise fees and international area development fees.

+ References

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X

- Definition

The number of offices.

+ References

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X

- Definition

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+ References

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X

- Definition

The total expense recognized in the period for promotion, public relations, and brand or product advertising.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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