Postretirement Plans (Schedule Of Actual Allocations For The Pension Assets And Target Allocations By Asset Class) (Details) (Pension Plans [Member])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations	100.00%	100.00%
Defined benefit plan, target plan asset allocations	100.00%	100.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations	49.00%	53.00%
Defined benefit plan, target plan asset allocations	47.00%	49.00%
Global equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations	29.00%	26.00%
Defined benefit plan, target plan asset allocations	26.00%	30.00%
Private equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations	5.00%	6.00%
Defined benefit plan, target plan asset allocations	6.00%	6.00%
Real estate and real assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations	8.00%	6.00%
Defined benefit plan, target plan asset allocations	11.00%	6.00%
Global strategies [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations	4.00%	4.00%
Defined benefit plan, target plan asset allocations	4.00%	4.00%
Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, actual plan asset allocations	5.00%	5.00%
Defined benefit plan, target plan asset allocations	6.00%	5.00%