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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, 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 | $ 2,523 | $ 2,499 | $ 2,523 |  |  |  |
Gross carrying amount of indefinite-lived intangible assets |  | $ 614 |  | 614 |  |  |  |  |
Impairment of Goodwill |  |  |  | $ 25 | 394 | $ 540 | $ 253 | $ 1,279 | $ 507
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 | 611 | $ 586 | 611 |  |  |  |
Franchise Group |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  | 2,367 | 2,392 | 2,367 | 2,392 |  |  |  |
Impairment of Goodwill |  | $ 25 | $ 114 | 25 | 114 |  |  |  |
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 | $ 0 | 1 | 0 |  |  |  |
Impairment of Goodwill |  |  | $ 280 | $ 0 | $ 280 |  |  |  |
[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. Franchise trademarks were impaired by $25 million during the fourth quarter of 2023 as a result of the Company's annual impairment assessment.

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