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Employee Benefit Plans (Details 10)	12 Months Ended
Employee Benefit Plans (Details 10)	Dec. 31, 2011	Dec. 31, 2010
Pre Medicare Eligible Claims [Member]
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	9.00%	8.00%
Defined Benefit Plan, Description of Direction and Pattern of Change for Assumed Health Care Cost Trend Rate	9% down to 5% in 2015	8% down to 5% in 2013
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2015	2013
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%	5.00%
Medicare Eligible Claims [Member]
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	8.00%	8.00%
Defined Benefit Plan, Description of Direction and Pattern of Change for Assumed Health Care Cost Trend Rate	8% down to 5% in 2013	8% down to 5% in 2013
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2013	2013
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%	5.00%

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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