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Pensions And Other Postretirement Benefits (Target Allocation And Actual Asset Allocations For Pension And VEBA Plan Assets) (Details)
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Dec. 31, 2011
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Dec. 31, 2010
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VEBA Trust [Member]
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| Weighted average asset allocation | 100.00% | 100.00% |
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VEBA Trust [Member] | Equity Securities [Member]
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| Weighted average asset allocation | 42.00% | 44.40% |
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VEBA Trust [Member] | Fixed Income Investments [Member]
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| Weighted average asset allocation | 33.50% | 37.40% |
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VEBA Trust [Member] | Hedge Funds [Member]
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| Weighted average asset allocation | 14.60% | 13.80% |
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VEBA Trust [Member] | Private Equity Funds [Member]
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| Weighted average asset allocation | 4.50% | 4.30% |
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VEBA Trust [Member] | Real Estate [Member]
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| Weighted average asset allocation | 5.30% | |
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VEBA Trust [Member] | Cash [Member]
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| Weighted average asset allocation | 0.10% | 0.10% |
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Pension Benefits [Member]
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| Weighted average asset allocation | 100.00% | 100.00% |
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Pension Benefits [Member] | Equity Securities [Member]
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| Weighted average asset allocation | 41.70% | 42.00% |
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Pension Benefits [Member] | Fixed Income Investments [Member]
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| Weighted average asset allocation | 31.10% | 30.60% |
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Pension Benefits [Member] | Hedge Funds [Member]
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| Weighted average asset allocation | 13.50% | 14.40% |
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Pension Benefits [Member] | Private Equity Funds [Member]
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| Weighted average asset allocation | 5.20% | 5.00% |
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Pension Benefits [Member] | Structured Credit [Member]
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| Weighted average asset allocation | 6.00% | 5.40% |
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Pension Benefits [Member] | Real Estate [Member]
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| Weighted average asset allocation | 2.20% | 2.10% |
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Pension Benefits [Member] | Cash [Member]
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| Weighted average asset allocation | 0.30% | 0.50% |
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2012 Target Allocation | VEBA Trust [Member]
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| Weighted average asset allocation | 100.00% | |
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2012 Target Allocation | VEBA Trust [Member] | Equity Securities [Member]
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| Weighted average asset allocation | 41.80% | |
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2012 Target Allocation | VEBA Trust [Member] | Fixed Income Investments [Member]
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| Weighted average asset allocation | 32.10% | |
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2012 Target Allocation | VEBA Trust [Member] | Hedge Funds [Member]
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| Weighted average asset allocation | 14.90% | |
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2012 Target Allocation | VEBA Trust [Member] | Private Equity Funds [Member]
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| Weighted average asset allocation | 6.20% | |
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2012 Target Allocation | VEBA Trust [Member] | Real Estate [Member]
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| Weighted average asset allocation | 5.00% | |
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2012 Target Allocation | Pension Benefits [Member]
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| Weighted average asset allocation | 100.00% | |
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2012 Target Allocation | Pension Benefits [Member] | Equity Securities [Member]
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| Weighted average asset allocation | 43.10% | |
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2012 Target Allocation | Pension Benefits [Member] | Fixed Income Investments [Member]
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| Weighted average asset allocation | 30.20% | |
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2012 Target Allocation | Pension Benefits [Member] | Hedge Funds [Member]
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| Weighted average asset allocation | 13.80% | |
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2012 Target Allocation | Pension Benefits [Member] | Private Equity Funds [Member]
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| Weighted average asset allocation | 5.30% | |
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2012 Target Allocation | Pension Benefits [Member] | Structured Credit [Member]
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| Weighted average asset allocation | 3.80% | |
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2012 Target Allocation | Pension Benefits [Member] | Real Estate [Member]
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| Weighted average asset allocation | 3.80% |