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Pension Plans and Other Postretirement Benefits (Details15)	12 Months Ended
	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Year That Rate Reaches Ultimate Trend Rate	2028
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Ultimate Health Care Cost Trend Rate	5.00%
Defined Benefit Plan Health Care Cost Trend Rate Assumed For Next Fiscal Year	9.10%

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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