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Short And Long-Term Debt Loss on the Early Extinguishment of Debt (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Debt Disclosure [Abstract] |  |  |  |  |
Loss on the early extinguishment of debt | [1] | $ 0 | $ 0 | $ 4 | $ 0
[1] | Includes a net benefit of $11 million of former parent legacy items and an $8 million expense related to the settlement of the Strader legal matter in Corporate and Other, and $2 million of restructuring charges as follows: $1 million in the Company Owned Real Estate Brokerage Services segment and $1 million in the Real Estate Franchise Services segment for the three months ended June 30, 2017.

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 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 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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