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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, 2023 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2023 USD ($) Brokerage_Offices | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) franchisedandcompanyownedoffices | Dec. 31, 2021 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 | $ | $ 174 | $ 174 | $ 174 | $ 182 |
Forgiveness of Franchise Conversion and Development Advance Notes, Charge to Operations | $ |  |  | $ (34) | $ (45) | $ (32)
Franchise Group |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Beginning balance | 19,824 |  |  | 20,355 | 19,386
Additions | 571 |  |  | 548 | 1,583
Terminations/Closures | (2,092) |  |  | (1,079) | (614)
Ending balance | 18,303 |  |  | 19,824 | 20,355
Owned Brokerage Group |  |  |  |  |
Change in Number of Franchised and Company Owned Outlets [Roll Forward] |  |  |  |  |
Beginning balance | 679 |  |  | 675 | 673
Additions | 5 |  |  | 46 | 25
Terminations/Closures | (61) |  |  | (42) | (23)
Ending balance | 623 | 620 |  | 679 | 675

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