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Pension and Other Employee Benefits (Schedule of Weighted-Average Net Periodic Benefit Cost Assumptions) (Details)
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12 Months Ended |
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Defined Pension Benefits [Member]
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| Discount rate |
5.00% |
5.73% |
6.23% |
| Expected return on plan assets |
8.68% |
8.68% |
8.68% |
| Average |
4.40% |
4.50% |
4.51% |
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Other Benefits [Member]
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|
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| Discount rate |
5.00% |
5.50% |
6.00% |
| Expected return on plan assets |
8.25% |
8.25% |
8.25% |
| Average |
4.50% |
4.50% |
4.50% |
| Health care trend rate in the next year |
4.00% |
4.00% |
7.00% |
| Gradually declining to an ultimate trend rate of |
4.00% |
4.00% |
4.00% |
| Year that the rate reaches the ultimate trend rate |
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|
2027 |
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Minimum [Member] | Defined Pension Benefits [Member]
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| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase |
2.00% |
2.00% |
2.00% |
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Minimum [Member] | Other Benefits [Member]
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|
|
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| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase |
2.00% |
2.00% |
2.00% |
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Maximum [Member] | Defined Pension Benefits [Member]
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|
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| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase |
7.00% |
7.00% |
7.00% |
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Maximum [Member] | Other Benefits [Member]
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| Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase |
7.00% |
7.00% |
7.00% |