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Note 5. Franchising and Marketing Activities Franchising and Marketing Activities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2017 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2016 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2018 Brokerage_Offices	Dec. 31, 2015 franchisedandcompanyownedoffices
Franchisor Disclosure [Line Items]
Initial franchise and area development fees | $	$ 6	$ 8	$ 8
Annual volume incentives from Real Estate Franchisees | $	52	62	56
Brand Marketing Fund Revenue | $	$ 86	$ 87	$ 83
Franchised:
Franchisor Disclosure [Line Items]
Number of offices	15,830	14,039	13,314		12,771
Franchised: | Century 21®
Franchisor Disclosure [Line Items]
Number of offices	9,637	7,973	7,330
Franchised: | ERA®
Franchisor Disclosure [Line Items]
Number of offices	2,331	2,298	2,347
Franchised: | Coldwell Banker®
Franchisor Disclosure [Line Items]
Number of offices	2,380	2,330	2,289
Franchised: | Coldwell Banker Commercial®
Franchisor Disclosure [Line Items]
Number of offices	171	180	180
Franchised: | Sotheby’s International Realty®
Franchisor Disclosure [Line Items]
Number of offices	949	905	836
Franchised: | Better Homes and Gardens® Real Estate
Franchisor Disclosure [Line Items]
Number of offices	362	353	332
Company Owned:
Franchisor Disclosure [Line Items]
Royalty expense | $	$ 295	$ 299	$ 282
Marketing and Advertising Expense | $	$ 11	$ 12	$ 11
Number of offices	755	789	789	760	787
Company Owned: | Coldwell Banker®
Franchisor Disclosure [Line Items]
Number of offices	672	707	708
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	42	41	40

X

- Definition

Amount of annual volume incentives provided to real estate franchisees

+ References

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- Definition

Brand Marketing Fund Revenue

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- Definition

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

+ References

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- Definition

The number of offices.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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