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Summary of Significant Accounting Policies Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ (48)	$ (131)	$ (18)
Dividends received from unconsolidated entities	51	101	3
Payments to Acquire Equity Method Investments	$ 39	5	12
Guaranteed Rate Affinity
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	49.90%
Equity Method Investments	$ 94	90
Income (Loss) from Equity Method Investments	(49)	(126)	(15)
Dividends received from unconsolidated entities	44	96	0
Payments to Acquire Equity Method Investments			2
Other Realogy Title Group's Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	8
Income (Loss) from Equity Method Investments	(6)	(5)	(3)
Dividends received from unconsolidated entities	$ 7	5	$ 3
RealSure
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	49.00%
The Real Estate Auction Joint Venture
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Realogy Brokerage Group's Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 29	2
Income (Loss) from Equity Method Investments	(7)
Payments to Acquire Equity Method Investments	$ 34	$ 2

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