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Acquisitions (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
real_estate_brokerage_operations
Dec. 31, 2021
USD ($)
real_estate_brokerage_operations
Dec. 31, 2020
USD ($)
Acquisitions [Line Items]      
Goodwill acquired $ 26 [1] $ 26 [2] $ 1
Owned Brokerage Group      
Acquisitions [Line Items]      
Number of Businesses Acquired | real_estate_brokerage_operations 4 3,000,000  
Asset Acquisition, Consideration Transferred $ 16 $ 26  
Asset Acquisition, Consideration Transferred, Contingent Consideration 11 6  
Goodwill acquired 21 [1] 24 [2] $ 0
Asset Acquisition, Consideration Transferred, Other Assets 26 12  
Asset Acquisition, Consideration Transferred, Other Liabilities 26 10  
Owned Brokerage Group | Amortizable—Other      
Acquisitions [Line Items]      
Finite-lived Intangible Assets Acquired $ 6 4  
Owned Brokerage Group | Indefinite life—Trademarks      
Acquisitions [Line Items]      
Indefinite-lived Intangible Assets Acquired   $ 2  
[1] 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.
[2] Goodwill acquired during the year ended December 31, 2021 relates to the acquisition of three real estate brokerage operations and one title and settlement operation.