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Summary of Significant Accounting Policies Impairment of Goodwill, Intangible Assets and Other Long-Lived Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2008 | Dec. 31, 2007
Goodwill and Intangible Asset Impairment [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 2,499 |  | $ 2,499 | $ 2,499 |  |  |  |  |
Gross carrying amount of indefinite-lived intangible assets |  |  |  | 614 |  |  |  |  |  |
Impairment of Goodwill |  |  |  | $ 0 | $ 25 | $ 394 | $ 540 | $ 253 | $ 1,279 | $ 507
Cartus Reporting Unit, Percentage of Fair Value in Excess of Carrying Value |  |  |  | 900.00% |  |  |  |  |  |
Trademark, Percentages of Fair Value in Excess of Carrying Value |  | 300.00% |  |  | 300.00% |  |  |  |  |
Indefinite life—Trademarks |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Line Items] |  |  |  |  |  |  |  |  |  |
Gross carrying amount of indefinite-lived intangible assets | [1] | $ 586 |  | $ 584 | $ 586 |  |  |  |  |
Franchise Group |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  | 2,367 |  | 2,367 | 2,367 |  |  |  |  |
Impairment of Goodwill |  | $ 25 | $ 114 | 0 | 25 |  |  |  |  |
Franchise Group | Indefinite life—Trademarks |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill) |  | Costs and Expenses | Costs and Expenses |  |  |  |  |  |  |
Owned Brokerage Group |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 1 |  | 1 | 1 |  |  |  |  |
Impairment of Goodwill |  |  | $ 280 | $ 0 | $ 0 |  |  |  |  |
[1] | Primarily related to real estate franchise, title and relocation trademarks which are expected to generate future cash flows for an indefinite period of time. The year ended December 31, 2024 includes $2 million reduction for the sale of a business.

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