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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 |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Pension Plan, Defined Benefit [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 54.00% | 52.00%
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 |  | 46.00% | 48.00%
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] | Equity Securities [Member] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 69.00% | 65.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 55.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 75.00% |  |
Other Postretirement Benefit Plan, Defined Benefit [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 31.00% | 35.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 25.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 45.00% |  |

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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 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&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=28361610&loc=d3e2446-114920 + 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=28361610&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=28361610&loc=d3e2446-114920 + 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=28361610&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=28361610&loc=d3e1928-114920 + Details
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