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Employee Benefits Schedule of Allocation of Plan Assets (Details) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 100.00% | 100.00%
Defined Benefit Plan, Actual Plan Asset Allocations | 100.00% | 100.00%
Defined Benefit Pension Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 67.00% | 67.00%
Defined Benefit Plan, Actual Plan Asset Allocations | 68.00% | 67.00%
Defined Benefit Pension Plan [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 33.00% | 33.00%
Defined Benefit Plan, Actual Plan Asset Allocations | 32.00% | 33.00%
Other Postretirement Benefit Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 100.00% | 100.00%
Defined Benefit Plan, Actual Plan Asset Allocations | 100.00% | 100.00%
Other Postretirement Benefit Plans [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 62.00% | 64.00%
Defined Benefit Plan, Actual Plan Asset Allocations | 60.00% | 60.00%
Other Postretirement Benefit Plans [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 38.00% | 36.00%
Defined Benefit Plan, Actual Plan Asset Allocations | 40.00% | 40.00%
Non Qualified Benefit Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 100.00% | 100.00%
Defined Benefit Plan, Actual Plan Asset Allocations | 100.00% | 100.00%
Non Qualified Benefit Plans [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 11.00% | 14.00%
Defined Benefit Plan, Actual Plan Asset Allocations | 15.00% | 15.00%
Non Qualified Benefit Plans [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 11.00% | 8.00%
Defined Benefit Plan, Actual Plan Asset Allocations | 7.00% | 7.00%
Non Qualified Benefit Plans [Member] | Other Contract [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 78.00% | 78.00%
Defined Benefit Plan, Actual Plan Asset Allocations | 78.00% | 78.00%

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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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- 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=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)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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