Pension and Other Benefits (Schedule Of Benefit Obligations Weighted Average Asset Allocation) (Details)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%	100.00%
Equity securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	60.00%	47.00%	44.00%
Debt And Fixed Income Securities [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	39.00%	41.00%	37.00%
Alternative Investments [Member]
Defined Benefit Plan, Actual Plan Asset Allocations	1.00%	4.00%
Cash And Other Alternative Investments [Member]
Defined Benefit Plan, Actual Plan Asset Allocations		8.00%	19.00%