Postretirement Plans (Schedule Of Assumptions Used To Calculate The Benefit Obligation) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	7.50%	7.75%	7.75%
Rate of compensation increase	4.00%	3.90%	5.20%
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.80%	4.40%	5.30%
Other Postretirement Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.30%	4.00%	4.90%