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Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Pension Benefit Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 100.00% | 100.00%
Other Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 100.00% | 100.00%
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan allocations | 55.00% | 43.00%
Equity Securities [Member] | Pension Benefit Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 59.10% | 60.70%
Equity Securities [Member] | Other Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 50.00% | 49.50%
Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan allocations | 38.00% | 50.00%
Debt Securities [Member] | Pension Benefit Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 37.80% | 35.80%
Debt Securities [Member] | Other Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 47.40% | 47.50%
Cash [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan allocations | 2.00% | 2.00%
Cash [Member] | Pension Benefit Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 1.30% | 1.20%
Cash [Member] | Other Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 2.40% | 2.80%
Commodities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan allocations | 5.00% | 5.00%
Commodities [Member] | Pension Benefit Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 1.80% | 2.30%
Commodities [Member] | Other Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 0.20% | 0.20%

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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=58740216&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=58740216&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=58740216&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=58740216&loc=d3e1928-114920 + Details
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