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Franchising and Marketing Activities (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2022 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2021 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2023 Brokerage_Offices | Dec. 31, 2020 franchisedandcompanyownedoffices
Franchisor Disclosure [Line Items] |  |  |  |  |
Initial franchise and area development fees | $ | $ 5 | $ 4 | $ 5 |  |
Annual volume incentives from Real Estate Franchisees | $ | 43 | 61 | 87 |  |
Brand Marketing Fund Revenue | $ | $ 82 | $ 89 | $ 92 |  |
Franchise Group |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 18,303 | 19,824 | 20,355 |  | 19,386
Franchise Group | Century 21® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 11,972 | 13,611 | 14,246 |  |
Franchise Group | ERA® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 2,395 | 2,407 | 2,355 |  |
Franchise Group | Coldwell Banker® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 2,140 | 2,100 | 2,071 |  |
Franchise Group | Coldwell Banker Commercial® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 189 | 171 | 164 |  |
Franchise Group | Sotheby’s International Realty® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 1,071 | 1,035 | 986 |  |
Franchise Group | Better Homes and Gardens® Real Estate |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 440 | 418 | 411 |  |
Franchise Group | Corcoran® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 96 | 82 | 122 |  |
Owned Brokerage Group |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Royalty expense | $ | $ (301) | $ (358) | $ (393) |  |
Marketing and Advertising Expense | $ | $ (14) | $ (15) | $ (14) |  |
Number of offices | 623 | 679 | 675 | 620 | 673
Owned Brokerage Group | Coldwell Banker® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 551 | 606 | 605 |  |
Owned Brokerage Group | Sotheby’s International Realty® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 44 | 44 | 41 |  |
Owned Brokerage Group | Corcoran® |  |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |  |
Number of offices | 28 | 29 | 29 |  |

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