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Goodwill (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) real_estate_brokerage_operations | Dec. 31, 2022 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2008 USD ($) | Dec. 31, 2007 USD ($)
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  | $ 5,497 |  | $ 5,496 |  |  |  |  |  |
Goodwill acquired |  |  | 0 |  | 1 | [1] |  |  |  |  |
Goodwill, Written off Related to Sale of Business Unit |  |  | 0 |  | 0 |  |  |  |  |  |
Goodwill Balance, end of period | $ 5,497 | $ 5,496 | 5,497 |  | 5,497 |  | $ 5,496 |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |
Accumulated Impairment Loss, beginning of period |  |  | (2,998) |  | (2,973) |  |  |  |  |  |
Goodwill, Impairment Loss |  |  | 0 |  | (25) |  | (394) | $ (540) | $ (253) | $ (1,279) | $ (507)
Accumulated Impairment Loss, end of period | (2,998) | (2,973) | (2,998) | [2] | (2,998) |  | (2,973) |  |  |  |
Goodwill, Total | 2,499 |  | 2,499 |  | 2,499 |  |  |  |  |  |
Impairment of Goodwill |  |  | 0 |  | 25 |  | 394 | $ 540 | $ 253 | $ 1,279 | $ 507
Franchise Group |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  | 3,953 |  | 3,953 |  |  |  |  |  |
Goodwill acquired |  |  | 0 |  | 0 | [1] |  |  |  |  |
Goodwill, Written off Related to Sale of Business Unit |  |  | 0 |  | 0 |  |  |  |  |  |
Goodwill Balance, end of period | 3,953 | 3,953 | 3,953 |  | 3,953 |  | 3,953 |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |
Accumulated Impairment Loss, beginning of period |  |  | (1,586) |  | (1,561) |  |  |  |  |  |
Goodwill, Impairment Loss | (25) | (114) | 0 |  | (25) |  |  |  |  |  |
Accumulated Impairment Loss, end of period | (1,586) | (1,561) | (1,586) | [2] | (1,586) |  | (1,561) |  |  |  |
Goodwill, Total | 2,367 |  | 2,367 |  | 2,367 |  |  |  |  |  |
Impairment of Goodwill | $ 25 | $ 114 | 0 |  | 25 |  |  |  |  |  |
Franchise Group | Indefinite life—Trademarks |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill) | Costs and Expenses | Costs and Expenses |  |  |  |  |  |  |  |  |
Owned Brokerage Group |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  | 1,089 |  | 1,088 |  |  |  |  |  |
Goodwill acquired |  |  | 0 |  | 1 | [1] |  |  |  |  |
Goodwill, Written off Related to Sale of Business Unit |  |  | 0 |  | 0 |  |  |  |  |  |
Goodwill Balance, end of period | $ 1,089 | $ 1,088 | 1,089 |  | 1,089 |  | 1,088 |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |
Accumulated Impairment Loss, beginning of period |  |  | (1,088) |  | (1,088) |  |  |  |  |  |
Goodwill, Impairment Loss |  | (280) | 0 |  | 0 |  |  |  |  |  |
Accumulated Impairment Loss, end of period | (1,088) | (1,088) | (1,088) | [2] | (1,088) |  | (1,088) |  |  |  |
Goodwill, Total | 1 |  | 1 |  | 1 |  |  |  |  |  |
Impairment of Goodwill |  | 280 | 0 |  | $ 0 |  |  |  |  |  |
Number of Businesses Acquired | real_estate_brokerage_operations |  |  |  |  | 1 |  |  |  |  |  |
Title Group |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  | 455 |  | $ 455 |  |  |  |  |  |
Goodwill acquired |  |  | 0 |  | 0 | [1] |  |  |  |  |
Goodwill, Written off Related to Sale of Business Unit |  |  | 0 |  | 0 |  |  |  |  |  |
Goodwill Balance, end of period | 455 | 455 | 455 |  | 455 |  | 455 |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |
Accumulated Impairment Loss, beginning of period |  |  | (324) |  | (324) |  |  |  |  |  |
Goodwill, Impairment Loss |  |  | 0 |  | 0 |  |  |  |  |  |
Accumulated Impairment Loss, end of period | (324) | $ (324) | (324) | [2] | (324) |  | $ (324) |  |  |  |
Goodwill, Total | $ 131 |  | 131 |  | 131 |  |  |  |  |  |
Impairment of Goodwill |  |  | $ 0 |  | $ 0 |  |  |  |  |  |
[1] | Goodwill acquired during the year ended December 31, 2023 relates to the acquisition of one real estate brokerage operation.
[2] | Includes impairment charges which reduced goodwill by $25 million during 2023, $394 million during 2022, $540 million during 2020, $253 million during 2019, $1,279 million during 2008 and $507 million during 2007.

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