Pension And Postretirement Benefits (Schedule Of Pension Plan Target Allocations And Weighted-Average Asset Allocations By Asset Category) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
DefinedBenefitPlantargetallocationrange	15%-75%
Actual asset allocation, percentage	43.00%	39.00%
Fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]
DefinedBenefitPlantargetallocationrange	15%-75%
Actual asset allocation, percentage	26.00%	24.00%
Alternative assets/Other [Member]
Defined Benefit Plan Disclosure [Line Items]
DefinedBenefitPlantargetallocationrange	0%-45%
Actual asset allocation, percentage	29.00%	32.00%
Money market [Member]
Defined Benefit Plan Disclosure [Line Items]
DefinedBenefitPlantargetallocationrange	0%-10%
Actual asset allocation, percentage	2.00%	5.00%