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Impairment of Goodwill and Other Indefinite-lived Intangible Assets (Details) - USD ($) | 3 Months Ended
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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 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. + References No definition available. + Details
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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 No definition available. + Details
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- Definition 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 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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- Definition 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 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 + Details
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