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Pension Plans and Other Postretirement Benefits Defined Benefit Plan Asset Target Allocation (Details) - Total Pension Benefits | 12 Months Ended
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Dec. 31, 2016
Equity Securities |
Defined Benefit Plan Disclosure [Line Items] |
Target allocations percentage of assets | 44.00%
Fixed Income |
Defined Benefit Plan Disclosure [Line Items] |
Target allocations percentage of assets | 42.00%
Absolute Return |
Defined Benefit Plan Disclosure [Line Items] |
Target allocations percentage of assets | 13.00%
Other |
Defined Benefit Plan Disclosure [Line Items] |
Target allocations percentage of assets | 1.00%

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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=65897934&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=65897934&loc=d3e1928-114920 + Details
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