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Summary of Significant Accounting Policies Investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Proceeds from investments in unconsolidated entities	$ 0	$ 19,000,000	$ 11,000,000
Equity Method Investments	69,000,000	51,000,000
Income (Loss) from Equity Method Investments	(18,000,000)	4,000,000	(18,000,000)
Proceeds from Equity Method Investment, Distribution	3,000,000	3,000,000	63
Payments to Acquire Equity Method Investments	$ 12,000,000	15,000,000	55,000,000
Amortization of Intangible Assets related to GRA Acquisition
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments		2,000,000	3,000,000
Realogy Brokerage Group | Gain from sale of PHHHL assets by Guaranteed Rate Affinity
Schedule of Equity Method Investments [Line Items]
Equity Method Investments			35
Income (Loss) from Equity Method Investments			(6)
Realogy Brokerage Group | Exit Costs related to PHHHL
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments			(7)
Realogy Title Group
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments			(4)
Realogy Title Group | Amortization of Intangible Assets related to GRA Acquisition
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments			(3)
PHH Home Loans
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	4990.00%
Proceeds from investments in unconsolidated entities		19
Equity Method Investments		0
PHH Home Loans | Realogy Brokerage Group
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments			22,000,000
Guaranteed Rate Affinity
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Unowned Percentage	5010.00%
Equity Method Investment, Ownership Percentage	4990.00%
Equity Method Investments	$ 60,000,000	43,000,000
Payments to Acquire Equity Method Investments	$ 2,000,000	$ 4,000,000	$ 55,000,000

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