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Retirement Benefits (Assumptions Used To Determine Benefit Obligations) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Discount rate at measurement date	4.50%	5.25%
Increase in future compensation	3.50%	3.50%
Medical cost trend rate (initial)
Medical cost trend rate (ultimate)
Years to ultimate rate	-	-
Postretirement Benefits [Member]
Discount rate at measurement date	4.50%	5.25%
Increase in future compensation	3.50%	3.50%
Medical cost trend rate (initial)	5.50%	6.00%
Medical cost trend rate (ultimate)	5.00%	5.00%
Years to ultimate rate	10 year	2 years

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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