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Franchising and Marketing Activities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2023 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2022 USD ($) franchisedandcompanyownedoffices	Dec. 31, 2024 Brokerage_Offices	Dec. 31, 2021 franchisedandcompanyownedoffices
Franchisor Disclosure [Line Items]
Initial franchise and area development fees | $	$ 5	$ 5	$ 4
Annual volume incentives from Real Estate Franchisees | $	46	43	61
Brand Marketing Fund Revenue | $	$ 75	$ 82	$ 89
Franchise Group
Franchisor Disclosure [Line Items]
Number of offices	17,205	18,303	19,824		20,355
Franchise Group | Century 21®
Franchisor Disclosure [Line Items]
Number of offices	10,986	11,972	13,611
Franchise Group | ERA®
Franchisor Disclosure [Line Items]
Number of offices	2,291	2,395	2,407
Franchise Group | Coldwell Banker®
Franchisor Disclosure [Line Items]
Number of offices	2,145	2,140	2,100
Franchise Group | Coldwell Banker Commercial®
Franchisor Disclosure [Line Items]
Number of offices	208	189	171
Franchise Group | Sotheby’s International Realty®
Franchisor Disclosure [Line Items]
Number of offices	1,065	1,071	1,035
Franchise Group | Better Homes and Gardens® Real Estate
Franchisor Disclosure [Line Items]
Number of offices	386	440	418
Franchise Group | Corcoran®
Franchisor Disclosure [Line Items]
Number of offices	124	96	82
Owned Brokerage Group
Franchisor Disclosure [Line Items]
Royalty expense | $	$ (304)	$ (301)	$ (358)
Marketing and Advertising Expense | $	$ (15)	$ (14)	$ (15)
Number of offices	575	623	679	580	675
Owned Brokerage Group | Coldwell Banker®
Franchisor Disclosure [Line Items]
Number of offices	506	551	606
Owned Brokerage Group | Sotheby’s International Realty®
Franchisor Disclosure [Line Items]
Number of offices	44	44	44
Owned Brokerage Group | Corcoran®
Franchisor Disclosure [Line Items]
Number of offices	25	28	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
-Topic 220
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-Name Accounting Standards Codification
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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