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Acquisitions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) real_estate_brokerage_operations		Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Acquisitions [Line Items]
Goodwill acquired	$ 26	[1]	$ 1	$ 1
Realogy Brokerage Group
Acquisitions [Line Items]
Number of Businesses Acquired | real_estate_brokerage_operations	3
Asset Acquisition, Consideration Transferred	$ 26
Asset Acquisition, Consideration Transferred, Contingent Consideration			6
Goodwill acquired	24	[1]	$ 0	$ 0
Asset Acquisition, Consideration Transferred, Other Assets	12
Asset Acquisition, Consideration Transferred, Other Liabilities	10
Realogy Brokerage Group | Amortizable—Other
Acquisitions [Line Items]
Finite-lived Intangible Assets Acquired	4
Realogy Brokerage Group | Indefinite life—Trademarks
Acquisitions [Line Items]
Indefinite-lived Intangible Assets Acquired	$ 2
[1] Goodwill acquired during the year ended December 31, 2021 relates to the acquisition of three real estate brokerage operations and one title and settlement operations.

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