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Acquisitions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($) real_estate_brokerage_operations
Acquisitions [Line Items]
Goodwill Acquired	$ 25	[1]
Owned Brokerage Group
Acquisitions [Line Items]
Number of Businesses Acquired | real_estate_brokerage_operations	4
Asset Acquisition, Consideration Transferred	$ 16
Asset Acquisition, Consideration Transferred, Contingent Consideration	10
Goodwill Acquired	20	[1]
Asset Acquisition, Consideration Transferred, Other Assets	26
Asset Acquisition, Consideration Transferred, Other Liabilities	26
Owned Brokerage Group | Amortizable—Other (f)
Acquisitions [Line Items]
Finite-Lived Intangible Assets Acquired	$ 6
[1] Goodwill acquired during the nine months ended September 30, 2022 relates to the acquisition of four real estate brokerage operations and two title and settlement operations.

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