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Reconciliation of Depreciation and Amortization from Segments to Consolidated (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |
Depreciation and amortization | $ 186 | [1] | $ 195 | [1] | $ 195
Realogy Franchise Group |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |
Depreciation and amortization | 87 |  | 104 |  | 110
Realogy Brokerage Group |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |
Depreciation and amortization | 59 |  | 54 |  | 51
Realogy Title Group |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |
Depreciation and amortization | 11 |  | 13 |  | 13
Corporate and Other |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |
Depreciation and amortization | $ 29 |  | $ 24 |  | $ 21
[1] | Depreciation and amortization for the year ended December 31, 2018 includes $2 million of amortization expense related to Guaranteed Rate Affinity's purchase accounting included in the "Equity in (earnings) losses of unconsolidated entities" line on the Consolidated Statement of Operations.

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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