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Acquisitions (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) real_estate_brokerage_operations | Dec. 31, 2022 USD ($) real_estate_brokerage_operations
Acquisitions [Line Items] |  |  |  |
Goodwill acquired | $ 1 | [1] | $ 26 | [2]
Owned Brokerage Group |  |  |  |
Acquisitions [Line Items] |  |  |  |
Number of Businesses Acquired | real_estate_brokerage_operations | 1 |  | 4 |
Asset Acquisition, Consideration Transferred |  |  | $ 16 |
Asset Acquisition, Consideration Transferred, Contingent Consideration |  |  | 11 |
Goodwill acquired | $ 1 | [1] | 21 | [2]
Asset Acquisition, Consideration Transferred, Other Assets |  |  | 26 |
Asset Acquisition, Consideration Transferred, Other Liabilities |  |  | 26 |
Owned Brokerage Group | Amortizable—Other |  |  |  |
Acquisitions [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 6 |
[1] | Goodwill acquired during the year ended December 31, 2023 relates to the acquisition of one real estate brokerage operation.
[2] | Goodwill acquired during the year ended December 31, 2022 relates to the acquisition of four real estate brokerage operations and two title and settlement operations.

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