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Acquisitions (Details)
$ in Millions
 12 Months Ended
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.