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Employee Benefit Plans (Details 9)	12 Months Ended
Employee Benefit Plans (Details 9)	Dec. 31, 2011	Dec. 31, 2010
Assumed healthcare cost trend rates
Healthcare cost trend rate	7.30%	7.80%
Direction and pattern of change, year	2012	2011
Year that rate reaches ultimate trend rate	2083	2083
Ultimate healthcare cost trend rate	4.30%	4.40%

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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