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Employee Benefit Plans (Asset Target Allocation) (Details) | Dec. 31, 2017
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Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Actual % | 41.00%
Equity securities | Minimum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target % | 41.00%
Equity securities | Maximum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target % | 60.00%
Fixed income securities |
Defined Benefit Plan Disclosure [Line Items] |
Actual % | 50.00%
Fixed income securities | Minimum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target % | 40.00%
Fixed income securities | Maximum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target % | 50.00%
Other |
Defined Benefit Plan Disclosure [Line Items] |
Actual % | 9.00%
Other | Minimum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target % | 0.00%
Other | Maximum [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target % | 10.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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