Amount of annual volume incentives provided to real estate franchisees

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Brand Marketing Fund Revenue

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

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The number of offices.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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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=123367319&loc=SL114868664-224227

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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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

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Franchising and Marketing Activities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2020 USD ($) franchisedandcompanyownedoffices Countries	Dec. 31, 2019 USD ($) franchisedandcompanyownedoffices Countries	Dec. 31, 2021 Brokerage_Offices	Dec. 31, 2018 franchisedandcompanyownedoffices
Franchisor Disclosure [Line Items]
Initial franchise and area development fees \| $	$ 5	$ 7	$ 9
Annual volume incentives from Real Estate Franchisees \| $	87	63	50
Brand Marketing Fund Revenue \| $	$ 92	$ 69	$ 90
Franchised (domestic and international):
Franchisor Disclosure [Line Items]
Number of offices	20,355	19,386	17,776		15,830
Franchised (domestic and international): \| Century 21®
Franchisor Disclosure [Line Items]
Number of offices	14,246	13,222	11,640
Franchised (domestic and international): \| ERA®
Franchisor Disclosure [Line Items]
Number of offices	2,355	2,318	2,301
Franchised (domestic and international): \| Coldwell Banker®
Franchisor Disclosure [Line Items]
Number of offices	2,071	2,263	2,323
Franchised (domestic and international): \| Coldwell Banker Commercial®
Franchisor Disclosure [Line Items]
Number of offices	164	168	159
Franchised (domestic and international): \| Sotheby’s International Realty®
Franchisor Disclosure [Line Items]
Number of offices	986	952	962
Franchised (domestic and international): \| Better Homes and Gardens® Real Estate
Franchisor Disclosure [Line Items]
Number of offices	411	389	391
Franchised (domestic and international): \| Corcoran®
Franchisor Disclosure [Line Items]
Number of offices	122	74	0
Company owned:
Franchisor Disclosure [Line Items]
Royalty expense \| $	$ (393)	$ (306)	$ (282)
Marketing and Advertising Expense \| $	$ (14)	$ (10)	$ (11)
Number of offices	675	673	713	680	755
Company owned: \| Coldwell Banker®
Franchisor Disclosure [Line Items]
Number of offices	605	605	634
Company owned: \| Sotheby’s International Realty®
Franchisor Disclosure [Line Items]
Number of offices	41	39	37
Company owned: \| Corcoran®
Franchisor Disclosure [Line Items]
Number of offices	29	29	42