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Employee Benefit Plans (Details 9)	12 Months Ended
Employee Benefit Plans (Details 9)	Dec. 31, 2012	Dec. 31, 2011
Assumed healthcare cost trend rates
Healthcare cost trend rate	7.80%	7.30%
Year that rate reaches ultimate trend rate	2094	2083
Ultimate healthcare cost trend rate		4.30%
Ultimate healthcare cost trend rate for Pre-Medicare	4.40%
Ultimate healthcare cost trend rate for Post-Medicare	4.60%

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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