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Franchising and Marketing Activities Change in the Number of Franchised and Brokerage Outlets (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2024 USD ($) Brokerage_Offices | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2022 USD ($) franchisedandcompanyownedoffices
Franchisee Conversion Notes and Development Advance Notes |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Franchise conversion and development advance notes | $ | $ 164 | $ 164 | $ 164 | $ 174 |
Forgiveness of Franchise Conversion and Development Advance Notes, Charge to Operations | $ |  |  | $ (35) | $ (34) | $ (45)
Franchise Group |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Beginning balance | 18,303 |  |  | 19,824 | 20,355
Additions | 403 |  |  | 571 | 548
Terminations/Closures | (1,501) |  |  | (2,092) | (1,079)
Ending balance | 17,205 |  |  | 18,303 | 19,824
Owned Brokerage Group |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Beginning balance | 623 |  |  | 679 | 675
Additions | 1 |  |  | 5 | 46
Terminations/Closures | (49) |  |  | (61) | (42)
Ending balance | 575 | 580 |  | 623 | 679

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