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Pension and Other Postretirement Benefit Plans - Plan Asset Allocations (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Defined Benefit Plans, Company Stock Contributed (in Shares) |  |  | 500,000 |
Pension [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Actual Plan Asset Allocation | 100.00% |  | 100.00% |
Defined Benefit Plans, Company Stock Contributed (in Shares) | 0 |  |  |
Target Plan Asset Allocation | 100.00% |  |  |
Pension [Member] | Equity Securities [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Actual Plan Asset Allocation | 54.00% |  | 52.00% |
Target Plan Asset Allocation | 52.00% |  |  |
Pension [Member] | Debt Securities [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Actual Plan Asset Allocation | 28.00% |  | 27.00% |
Target Plan Asset Allocation | 30.00% |  |  |
Pension [Member] | Real Estate [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Actual Plan Asset Allocation | 5.00% |  | 5.00% |
Target Plan Asset Allocation | 9.00% |  |  |
Pension [Member] | Private Equity [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Actual Plan Asset Allocation | 13.00% |  | 16.00% |
Target Plan Asset Allocation | 9.00% |  |  |
Postretirement Health and Life [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Actual Plan Asset Allocation | 100.00% | [1] | 100.00% | [1]
Target Plan Asset Allocation | 100.00% | [1] |  |
Postretirement Health and Life [Member] | Equity Securities [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Actual Plan Asset Allocation | 56.00% | [1] | 51.00% | [1]
Target Plan Asset Allocation | 48.00% | [1] |  |
Postretirement Health and Life [Member] | Debt Securities [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Actual Plan Asset Allocation | 35.00% | [1] | 39.00% | [1]
Target Plan Asset Allocation | 34.00% | [1] |  |
Postretirement Health and Life [Member] | Real Estate [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Actual Plan Asset Allocation | 0.00% | [1] | 0.00% | [1]
Target Plan Asset Allocation | 9.00% | [1] |  |
Postretirement Health and Life [Member] | Private Equity [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Actual Plan Asset Allocation | 9.00% | [1] | 10.00% | [1]
Target Plan Asset Allocation | 9.00% | [1] |  |
[1] | Includes VEBAs and irrevocable grantor trusts.

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- Definition The number of employer shares or related party shares included in plan assets. + 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 (n) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph n -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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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 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=21915506&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=21915506&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=21915506&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=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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