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Restructuring Costs Restructuring Costs (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs, net |  | $ 30 | $ 5 | [1]
Personnel Related |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs, net | [2] | 14 | 5 |
Facility Related |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs, net | [3] | 9 | 0 |
Internal Use Software Impairment |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs, net | [4] | $ 7 | $ 0 |
[1] | Includes restructuring charges of $2 million in the Real Estate Franchise Services segment, $17 million in the Company Owned Real Estate Brokerage Services segment, $8 million in the Cartus segment, $1 million at Title and Settlement Services segment and $2 million in Corporate and Other for the three months ended March 31, 2018. Includes restructuring charges of $5 million in the Company Owned Real Estate Brokerage Services segment for the three months ended March 31, 2017.
[2] | Personnel-related costs consist of severance costs provided to employees who have been terminated and duplicate payroll costs during transition.
[3] | Facility-related costs consist of costs associated with planned facility closures such as contract termination costs, lease payments, net of applicable sublease income, that will continue to be incurred under the contract for its remaining term without economic benefit to the Company, accelerated depreciation on asset disposals and other facility and employee relocation related costs.
[4] | Internal use software impairment relates to development costs capitalized for a project that was determined to not meet the Company's strategic goals when analyzed by the Company's new leadership team.

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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