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Contingencies (UST Litigations Narrative) (Details) - UST Litigation [Member] | 3 Months Ended |
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Mar. 31, 2018 plantiff | Jul. 31, 2016 case
WEST VIRGINIA [Member] |  |
Loss Contingencies [Line Items] |  |
Number of plaintiffs | plantiff | 6 |
CALIFORNIA [Member] |  |
Loss Contingencies [Line Items] |  |
Number of cases pending | case |  | 1

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- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details
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