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Reconciliation of Depreciation and Amortization from Segments to Consolidated (Details) - USD ($) $ in Millions	12 Months Ended
	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

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