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Postretirement Plans (Schedule Of Assumed Health Care Cost Trend Rates) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Postretirement Plans [Abstract]
Health care cost trend rate assumed next year	7.50%	7.50%	7.00%
Ultimate trend rate	5.00%	5.00%	5.00%
Year that trend reached ultimate rate	2018	2018	2014

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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