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Income Taxes (Details 4) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Unrecognized Tax Benefits That Would Not Impact Effective Tax Rate | $ 10 | $ 87 |
Continuing Operations [Member] |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Unrecognized Tax Benefits | $ 100 | $ 91 | $ 98

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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