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Employee Benefits Allocation of Plan Assets (Details) | Dec. 31, 2017 | Dec. 31, 2016
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Allocation of Plan Assets |  |
Defined benefit plan, plan assets, target allocation, percentage | 100.00% |
Defined benefit plan, actual plan asset allocations | 100.00% | 100.00%
Alternative Investments |  |
Allocation of Plan Assets |  |
Defined benefit plan, plan assets, target allocation, percentage | 27.00% |
Defined benefit plan, actual plan asset allocations | 27.00% | 21.00%
Equity securities |  |
Allocation of Plan Assets |  |
Defined benefit plan, plan assets, target allocation, percentage | 23.00% |
Defined benefit plan, actual plan asset allocations | 23.00% | 23.00%
Fixed income securities |  |
Allocation of Plan Assets |  |
Defined benefit plan, plan assets, target allocation, percentage | 21.00% |
Defined benefit plan, actual plan asset allocations | 21.00% | 26.00%
Liability driven investments |  |
Allocation of Plan Assets |  |
Defined benefit plan, plan assets, target allocation, percentage | 14.00% |
Defined benefit plan, actual plan asset allocations | 14.00% | 14.00%
Real estate |  |
Allocation of Plan Assets |  |
Defined benefit plan, plan assets, target allocation, percentage | 6.00% |
Defined benefit plan, actual plan asset allocations | 6.00% | 6.00%
Other plan assets |  |
Allocation of Plan Assets |  |
Defined benefit plan, plan assets, target allocation, percentage | 9.00% |
Defined benefit plan, actual plan asset allocations | 9.00% | 10.00%

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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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- 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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