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Pension and Postretirement Health and Life Benefits (Plan Asset Allocations) (Details) | Dec. 31, 2018 | Dec. 31, 2017
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Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 100.00% | 100.00%
Equity Securities [Member] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 48.00% | 49.00%
Equity Securities [Member] | Minimum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 40.00% |
Equity Securities [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 60.00% |
Debt Securities [Member] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 49.00% | 49.00%
Debt Securities [Member] | Minimum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 40.00% |
Debt Securities [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 60.00% |
Cash [Member] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 3.00% | 2.00%
Cash [Member] | Minimum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |
Cash [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 5.00% |

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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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Percentage of actual 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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