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Employee Benefit Plans Assumed Health Care Cost Trent Rates for Medical Plans (Details) (Other Postretirement Benefit Plans, Defined Benefit)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Medical cost trend rate	8.00%	8.50%	8.00%
Ultimate medical cost trend rate	5.00%	5.00%	5.00%
Year ultimate medical cost trend rate will be reached	2019	2018	2013

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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