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Employee Benefit Plans (Assumed Health Care Cost Trend Rates Used to Determine the Postretirement Benefit Obligations) (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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| Health care cost trend rate assumed for next year: | ||
| Rate to which the cost trend rate is assumed to decline (ultimate trend rate) | 4.50% | 4.50% |
| Year that the rate reaches the ultimate trend rate | 2029 | |
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Medical | Minimum
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| Health care cost trend rate assumed for next year: | ||
| Health care cost trend rate assumed for next year | 6.93% | 6.95% |
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Medical | Maximum
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| Health care cost trend rate assumed for next year: | ||
| Health care cost trend rate assumed for next year | 7.53% | 7.68% |
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Prescription
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| Health care cost trend rate assumed for next year: | ||
| Health care cost trend rate assumed for next year | 8.66% | 9.08% |