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Investments, Equity Method and Joint Ventures (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Mar. 29, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	$ 199,000,000				$ 199,000,000			$ 131,000,000
Equity in losses (earnings) of unconsolidated entities	2,000,000			$ (11,000,000)	16,000,000	$ (52,000,000)
Dividends received from unconsolidated entities					(2,000,000)	(49,000,000)
Payments to Acquire Equity Method Investments					18,000,000	7,000,000
Title Group
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	166,000,000				166,000,000			102,000,000
Noncash or Part Noncash Acquisition, Investments Acquired			$ 90,000,000
Guaranteed Rate Affinity
Schedule of Equity Method Investments [Line Items]
Equity in losses (earnings) of unconsolidated entities	3,000,000			(11,000,000)
Guaranteed Rate Affinity | Title Group
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	$ 82,000,000				$ 82,000,000			94,000,000
Equity Method Investment, Ownership Percentage	49.90%				49.90%
Equity in losses (earnings) of unconsolidated entities					$ 12,000,000	(49,000,000)
Dividends received from unconsolidated entities					$ 0	(44,000,000)
Title Insurance Underwriter Joint Venture
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	26.00%				26.00%		30.00%
Equity Method Investment, Realized Gain (Loss) on Disposal		$ 4,000,000
Title Insurance Underwriter Joint Venture | Title Group
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	$ 74,000,000		$ 78		$ 74,000,000			0
Equity Method Investment, Ownership Percentage	26.00%		30.00%		26.00%		30.00%
Equity in losses (earnings) of unconsolidated entities	$ (2,000,000)				$ (5,000,000)
Dividends received from unconsolidated entities			$ (12,000,000)
Other Realogy Title Group's Equity Method Investments | Title Group
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	10,000,000				10,000,000			8,000,000
Equity in losses (earnings) of unconsolidated entities	(3,000,000)			(2,000,000)	(4,000,000)	(5,000,000)
Dividends received from unconsolidated entities					(2,000,000)	(5,000,000)
Realogy Brokerage Group's Equity Method Investments | Owned Brokerage Group
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	33,000,000				33,000,000			$ 29,000,000
Equity in losses (earnings) of unconsolidated entities	$ 4,000,000			$ 2,000,000	13,000,000	2,000,000
Payments to Acquire Equity Method Investments					$ 17,000,000	$ 3,000,000
RealSure Joint Venture | Owned Brokerage Group
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	49.00%				49.00%
Real Estate Auction Joint Venture | Owned Brokerage Group
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%				50.00%

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