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Franchising and Marketing Activities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2021 USD ($) franchisedandcompanyownedoffices Countries	Dec. 31, 2020 USD ($) franchisedandcompanyownedoffices Countries	Dec. 31, 2022 Brokerage_Offices	Dec. 31, 2019 franchisedandcompanyownedoffices
Franchisor Disclosure [Line Items]
Initial franchise and area development fees | $	$ 4	$ 5	$ 7
Annual volume incentives from Real Estate Franchisees | $	61	87	63
Brand Marketing Fund Revenue | $	$ 89	$ 92	$ 69
Franchise Group
Franchisor Disclosure [Line Items]
Number of offices	19,824	20,355	19,386		17,776
Franchise Group | Century 21®
Franchisor Disclosure [Line Items]
Number of offices	13,611	14,246	13,222
Franchise Group | ERA®
Franchisor Disclosure [Line Items]
Number of offices	2,407	2,355	2,318
Franchise Group | Coldwell Banker®
Franchisor Disclosure [Line Items]
Number of offices	2,100	2,071	2,263
Franchise Group | Coldwell Banker Commercial®
Franchisor Disclosure [Line Items]
Number of offices	171	164	168
Franchise Group | Sotheby’s International Realty®
Franchisor Disclosure [Line Items]
Number of offices	1,035	986	952
Franchise Group | Better Homes and Gardens® Real Estate
Franchisor Disclosure [Line Items]
Number of offices	418	411	389
Franchise Group | Corcoran®
Franchisor Disclosure [Line Items]
Number of offices	82	122	74
Owned Brokerage Group
Franchisor Disclosure [Line Items]
Royalty expense | $	$ (358)	$ (393)	$ (306)
Marketing and Advertising Expense | $	$ (15)	$ (14)	$ (10)
Number of offices	679	675	673	680	713
Owned Brokerage Group | Coldwell Banker®
Franchisor Disclosure [Line Items]
Number of offices	606	605	605
Owned Brokerage Group | Sotheby’s International Realty®
Franchisor Disclosure [Line Items]
Number of offices	44	41	39
Owned Brokerage Group | Corcoran®
Franchisor Disclosure [Line Items]
Number of offices	29	29	29

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Amount of annual volume incentives provided to real estate franchisees

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

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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
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-Subparagraph (SX 210.5-03.4)
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-Name Accounting Standards Codification
-Topic 220
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