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Pension and Other Post-Retirement Benefits (Details 5)	12 Months Ended
Pension and Other Post-Retirement Benefits (Details 5)	Dec. 31, 2011	Dec. 31, 2010
Medical Claims [Member]
Review of historical returns
Health care cost trend assumed for next year	7.50%	8.00%
Rate to which the cost trend is expected to decline (the ultimate trend rate)	5.00%	5.00%
Year that rate reaches the ultimate trend rate	2018	2018
Prescription drugs claims [Member]
Review of historical returns
Health care cost trend assumed for next year	7.50%	8.50%
Rate to which the cost trend is expected to decline (the ultimate trend rate)	5.00%	5.00%
Year that rate reaches the ultimate trend rate	2018	2018

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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