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Employee Benefit Plans Employee Benefit Plans 6 (Details) | Dec. 31, 2017 | Dec. 31, 2016
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Pension Benefits |  |
Employee benefit plans |  |
Actual asset allocations | 100.00% | 100.00%
Target asset allocations | 100.00% |
Pension Benefits | Equity securities |  |
Employee benefit plans |  |
Actual asset allocations | 57.00% | 57.00%
Target asset allocations | 60.00% |
Pension Benefits | Debt securities |  |
Employee benefit plans |  |
Actual asset allocations | 39.00% | 38.00%
Target asset allocations | 40.00% |
Pension Benefits | Real Estate Funds |  |
Employee benefit plans |  |
Actual asset allocations | 4.00% | 5.00%
Pension Benefits | Cash equivalents |  |
Employee benefit plans |  |
Actual asset allocations | 0.00% | 0.00%
Post-Retirement Medical Benefits |  |
Employee benefit plans |  |
Actual asset allocations | 100.00% | 100.00%
Target asset allocations | 100.00% |
Post-Retirement Medical Benefits | Equity securities |  |
Employee benefit plans |  |
Actual asset allocations | 59.00% | 58.00%
Target asset allocations | 60.00% |
Post-Retirement Medical Benefits | Debt securities |  |
Employee benefit plans |  |
Actual asset allocations | 37.00% | 39.00%
Target asset allocations | 40.00% |
Post-Retirement Medical Benefits | Real Estate Funds |  |
Employee benefit plans |  |
Actual asset allocations | 0.00% | 0.00%
Post-Retirement Medical Benefits | Cash equivalents |  |
Employee benefit plans |  |
Actual asset allocations | 4.00% | 3.00%

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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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