Pension Plans And Other Postretirement Benefit Plans (Investment Allocation Percentages By Asset Classes) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation	51.00%	51.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation	31.00%	31.00%
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation	5.00%	5.00%
Absolute Return [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation	10.00%	10.00%
Other Return [Member]
Defined Benefit Plan Disclosure [Line Items]
Target investment allocation	3.00%	3.00%