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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |
Depreciation and amortization | $ 198 | $ 202 | [1] | $ 201 | [1]
Real Estate Franchise Services |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |
Depreciation and amortization | 79 | 77 |  | 77 |
Company Owned Real Estate Brokerage Services |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |
Depreciation and amortization | 50 | 49 |  | 46 |
Relocation Services |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |
Depreciation and amortization | 33 | 31 |  | 33 |
Title and Settlement Services |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |
Depreciation and amortization | 16 | 23 |  | 25 |
Corporate and Other |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |
Depreciation and amortization | $ 20 | $ 22 |  | $ 20 |
[1] | Depreciation and amortization for the year ended December 31, 2017 includes $3 million of amortization expense related to Guaranteed Rate Affinity's purchase accounting included in the "Equity in earnings 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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