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Pension and Postretirement Health and Life Benefits (Plan Asset Allocations) (Details) - Pension Plan, Defined Benefit [Member]	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	49.00%	41.00%
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, Actual Plan Asset Allocations	51.00%	59.00%
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%

X

- 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(i)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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X

- 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=82843861&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=82843861&loc=d3e1928-114920

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