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Summary of Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2008 | Dec. 31, 2007 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Dec. 31, 2016
Minimum ownership percentage for consolidation |  |  |  | 5000.00% |  |  |  |  |
Advertising Expense |  |  |  | $ 196,000,000 |  | $ 207,000,000 | $ 211,000,000 |  |
Goodwill |  |  |  | 3,300,000,000 |  | 3,536,000,000 | 3,534,000,000 | $ 3,300,000,000 | $ 3,514,000,000
Indefinite-lived Intangible Assets (Excluding Goodwill) |  |  |  | 692,000,000 |  |  |  |  |
Goodwill, Impairment Loss, net of taxes |  |  |  | 180,000,000 |  |  |  |  |
Impairment of Goodwill |  | $ 1,153,000,000 | $ 489,000,000 | 237,000,000 | [1] |  |  |  |
Goodwill, Impairment Loss, Tax |  |  |  | $ 57,000,000 |  |  |  |  |
Percentage by which the estimated fair value of each reporting unit is lowered during goodwill evaluation |  |  |  | 1000.00% |  |  |  |  |
Realogy Brokerage Group |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 669,000,000 |  | $ 906,000,000 | $ 904,000,000 |  | $ 893,000,000
Goodwill, Impairment Loss, net of taxes |  |  |  | 180 |  |  |  |  |
Impairment of Goodwill | [1] |  |  | $ 237,000,000 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Remaining maturity of highly-liquid investments |  |  |  | 3 months |  |  |  |  |
[1] | The Company recognized a goodwill impairment charge of $237 million during the third quarter of 2019 related to Realogy Brokerage Group. The impairment charge of $237 million was offset by an income tax benefit of $57 million resulting in a net reduction in the carrying value of Realogy Brokerage Group of $180 million (see Note 20, "Selected Quarterly Financial Data", for additional information).

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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 The minimum ownership percentage of outstanding voting shares of an entity for which the Company consolidates an entity not deemed a VIE. + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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