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Impairment of Goodwill and Other Indefinite-lived Intangible Assets (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Sep. 30, 2019	Dec. 31, 2008	Dec. 31, 2007
Impairment of Goodwill and Other Indefinite-lived Intangible Assets [Line Items]
Goodwill, Impairment Loss	$ (413,000,000)	$ (237)	$ (1,153)	$ (489)
Realogy Franchise Group
Impairment of Goodwill and Other Indefinite-lived Intangible Assets [Line Items]
Goodwill, Impairment Loss	$ 0
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	700.00%
Realogy Franchise Group | Measurement Input, Discount Rate
Impairment of Goodwill and Other Indefinite-lived Intangible Assets [Line Items]
Impairment Assessment Assumption	10.00%	8.50%
Realogy Franchise Group | Measurement Input, Long-term Revenue Growth Rate
Impairment of Goodwill and Other Indefinite-lived Intangible Assets [Line Items]
Impairment Assessment Assumption	2.50%	2.50%
Realogy Franchise Group | Measurement Input, Hypothetical Discount Rate Increase [Member]
Impairment of Goodwill and Other Indefinite-lived Intangible Assets [Line Items]
Impairment Assessment Assumption	10000.00%
Realogy Franchise Group | Indefinite life—Trademarks (b) (c)
Impairment of Goodwill and Other Indefinite-lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 30,000,000
Realogy Brokerage Group
Impairment of Goodwill and Other Indefinite-lived Intangible Assets [Line Items]
Goodwill, Impairment Loss	(413,000,000)
Income tax benefit associated with Goodwill Impairment Charge	99,000,000
Net Decrease in Carrying Value	$ (314,000,000)
Realogy Brokerage Group | Measurement Input, Discount Rate
Impairment of Goodwill and Other Indefinite-lived Intangible Assets [Line Items]
Impairment Assessment Assumption	11.00%	9.00%
Realogy Brokerage Group | Measurement Input, Long-term Revenue Growth Rate
Impairment of Goodwill and Other Indefinite-lived Intangible Assets [Line Items]
Impairment Assessment Assumption	2.00%	2.00%
Realogy Title Group
Impairment of Goodwill and Other Indefinite-lived Intangible Assets [Line Items]
Goodwill, Impairment Loss	$ 0
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	500.00%
Realogy Title Group | Measurement Input, Discount Rate
Impairment of Goodwill and Other Indefinite-lived Intangible Assets [Line Items]
Impairment Assessment Assumption	11.00%	9.50%
Realogy Title Group | Measurement Input, Long-term Revenue Growth Rate
Impairment of Goodwill and Other Indefinite-lived Intangible Assets [Line Items]
Impairment Assessment Assumption	2.50%	2.50%
Realogy Title Group | Measurement Input, Hypothetical Discount Rate Increase [Member]
Impairment of Goodwill and Other Indefinite-lived Intangible Assets [Line Items]
Impairment Assessment Assumption	10000.00%

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- Definition

Impairment Assessment Assumption

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Impairment of Goodwill and Other Indefinite-lived Intangible Assets

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Income tax benefit as a result of the "simultaneous equation method" which requires the impairment charge and deferred tax effect to be adjusted at the same time effectively grossing up the goodwill impairment charge to account for the related income tax benefit so that the resulting carrying value does not exceed the calculated fair value.

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- Definition

Net decrease in carrying value at Realogy Brokerage Group as a result of the goodwill impairment charge taken in the third quarter of 2019.

+ References

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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