Postretirement Plans (Schedule Of Assumptions Used To Calculate The Benefit Obligation) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	7.75%	7.75%	8.00%
Rate of compensation increase	3.90%	5.20%	5.50%
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.40%	5.30%	5.80%
Other Postretirement Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.00%	4.90%	5.40%