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Employee Benefit Plans (Pension Plans' Range Targets) (Details) | Dec. 31, 2017
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Equity Securities [Member] |
Summary of target allocation percentage of assets |
Target | 25.00%
U.S. Equity [Member] |
Summary of target allocation percentage of assets |
Target | 12.50%
International Equity [Member] |
Summary of target allocation percentage of assets |
Target | 12.50%
Fixed Income, Money Market, Cash and Guaranteed Investment Contracts [Member] |
Summary of target allocation percentage of assets |
Target | 75.00%
Fixed Income [Member] |
Summary of target allocation percentage of assets |
Target | 73.00%
Money Market/Cash/Guaranteed Investments Contracts [Member] |
Summary of target allocation percentage of assets |
Target | 2.00%

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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