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Investments, Equity Method and Joint Ventures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	$ 205		$ 131
Equity in losses (earnings) of unconsolidated entities	10	$ (31)
Dividends received from unconsolidated entities	1	31
Payments to Acquire Equity Method Investments	7	6
Realogy Title Group
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	172		102
Guaranteed Rate Affinity | Realogy Title Group
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	$ 86		94
Equity Method Investment, Ownership Percentage	49.90%
Equity in losses (earnings) of unconsolidated entities	$ 8	(30)
Dividends received from unconsolidated entities	0	30
Title Insurance Underwriter Joint Venture | Realogy Title Group
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	$ 78		0
Equity Method Investment, Ownership Percentage	30.00%
Dividends received from unconsolidated entities	$ 12
Noncash or Part Noncash Acquisition, Investments Acquired	90
Other Realogy Title Group's Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Equity in losses (earnings) of unconsolidated entities	(1)
Other Realogy Title Group's Equity Method Investments | Realogy Title Group
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	8		8
Equity in losses (earnings) of unconsolidated entities		(1)
Dividends received from unconsolidated entities	1	1
Realogy Brokerage Group's Equity Method Investments | Realogy Brokerage Group
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investments	33		$ 29
Equity in losses (earnings) of unconsolidated entities	3	0
Payments to Acquire Equity Method Investments	$ 7	$ 3
RealSure Joint Venture | Realogy Brokerage Group
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	49.00%
Real Estate Auction Joint Venture | Realogy Brokerage Group
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%

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