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Investments, Equity Method and Joint Ventures (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 29, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	$ 200,000,000			$ 200,000,000			$ 131,000,000
Equity in losses (earnings) of unconsolidated entities	4,000,000		$ (10,000,000)	14,000,000	$ (41,000,000)
Dividends received from unconsolidated entities				1,000,000	38,000,000
Payments to Acquire Equity Method Investments				15,000,000	7,000,000
Title Group
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	165,000,000			165,000,000			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	(1,000,000)		(8,000,000)
Guaranteed Rate Affinity | Title Group
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	$ 85,000,000			$ 85,000,000			94,000,000
Equity Method Investment, Ownership Percentage	49.90%			49.90%
Equity in losses (earnings) of unconsolidated entities				$ (9,000,000)	(38,000,000)
Dividends received from unconsolidated entities				$ 0	35,000,000
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	$ 72,000,000	$ 78		$ 72,000,000			0
Equity Method Investment, Ownership Percentage	26.00%	30.00%		26.00%
Equity in losses (earnings) of unconsolidated entities	$ (3,000,000)			$ (3,000,000)
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	8,000,000			8,000,000			8,000,000
Equity in losses (earnings) of unconsolidated entities	0		(2,000,000)	(1,000,000)	(3,000,000)
Dividends received from unconsolidated entities				1,000,000	3,000,000
Realogy Brokerage Group's Equity Method Investments | Owned Brokerage Group
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	35,000,000			35,000,000			$ 29,000,000
Equity in losses (earnings) of unconsolidated entities	$ 6,000,000		$ 0	(9,000,000)	0
Payments to Acquire Equity Method Investments				$ 15,000,000	$ 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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