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Pension and Other Postretirement Benefits (Details 8)	12 Months Ended
Pension and Other Postretirement Benefits (Details 8)	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	5.00%	5.00%
Pre Medicare [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Year that the rate reaches the ultimate trend rate	2016	2016
Health care cost trend rate assumed	7.50%	8.00%
Post Medicare [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Year that the rate reaches the ultimate trend rate	2018	2018
Health care cost trend rate assumed	8.50%	9.00%

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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