Pension And Other Postretirement Benefits (Schedule Of Weighted Average Assumptions Used In Determining Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Ultimate healthcare trend rate	8.50%
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.50%	5.78%	6.06%
Rate of return	8.31%	8.27%	8.17%
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.10%	5.60%	6.05%
Initial healthcare trend rate	8.00%	9.00%	10.00%
Ultimate healthcare trend rate	5.00%	5.00%	5.00%