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Employee Benefit Plans Employee Benefit Plans 6 (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Pension Benefits |  |
Actual and Target Asset Allocations |  |
Actual asset allocations | 100.00% | 100.00%
Target asset allocations | 100.00% |
Pension Benefits | Equity securities |  |
Actual and Target Asset Allocations |  |
Actual asset allocations | 57.00% | 55.00%
Target asset allocations | 60.00% |
Pension Benefits | Debt securities |  |
Actual and Target Asset Allocations |  |
Actual asset allocations | 38.00% | 40.00%
Target asset allocations | 40.00% |
Pension Benefits | Real Estate Funds |  |
Actual and Target Asset Allocations |  |
Actual asset allocations | 5.00% | 5.00%
Pension Benefits | Cash equivalents |  |
Actual and Target Asset Allocations |  |
Actual asset allocations | 0.00% | 0.00%
Post-Retirement Medical Benefits |  |
Actual and Target Asset Allocations |  |
Actual asset allocations | 100.00% | 100.00%
Target asset allocations | 100.00% |
Post-Retirement Medical Benefits | Equity securities |  |
Actual and Target Asset Allocations |  |
Actual asset allocations | 58.00% | 60.00%
Target asset allocations | 60.00% |
Post-Retirement Medical Benefits | Debt securities |  |
Actual and Target Asset Allocations |  |
Actual asset allocations | 39.00% | 38.00%
Target asset allocations | 40.00% |
Post-Retirement Medical Benefits | Real Estate Funds |  |
Actual and Target Asset Allocations |  |
Actual asset allocations | 0.00% | 0.00%
Post-Retirement Medical Benefits | Cash equivalents |  |
Actual and Target Asset Allocations |  |
Actual asset allocations | 3.00% | 2.00%

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + 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)(i) -URI http://asc.fasb.org/extlink&oid=58740216&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)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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