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Pension and Postretirement Health and Life Benefits Pension and Postretirement Health and Life Benefits (Plan Asset Allocations) (Details) | 12 Months Ended |
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Dec. 31, 2016 | Dec. 31, 2015
Pension Plan, Defined Benefit [Member] |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 100.00% | 100.00%
Pension Plan, Defined Benefit [Member] | Equity Securities [Member] |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 41.00% | 47.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 40.00% |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 60.00% |
Pension Plan, Defined Benefit [Member] | Debt Securities [Member] |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 59.00% | 53.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 40.00% |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 60.00% |
Other Postretirement Benefit Plan, Defined Benefit [Member] |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 100.00% | 100.00%
Other Postretirement Benefit Plan, Defined Benefit [Member] | Equity Securities [Member] |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 100.00% | 64.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 85.00% |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 100.00% |
Other Postretirement Benefit Plan, Defined Benefit [Member] | Debt Securities [Member] |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 0.00% | 36.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 0.00% |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 15.00% |

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- Definition Target allocation maximum percentage 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 Target allocation minimum percentage 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 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: 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 + Details
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