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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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