Pension And Other Postretirement Benefits (Schedule Of Allocation Of Plan Assets) (Details)	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	100.00%	100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%	100.00%
Equity Securities - U.S. [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	6.00%	7.00%
Equity Securities - International [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	5.00%	5.00%
Fixed Income Investments - U.S. [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	52.00%	46.00%
Hedge Funds [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	1.00%	6.00%
Private equity [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	8.00%	8.00%
Real assets [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	6.00%	5.00%
Other investments [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	4.00%	4.00%
Short-term Investments [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual Allocation	18.00%	19.00%
Minimum [Member] | Equity Securities - U.S. [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	3.00%	3.00%
Minimum [Member] | Equity Securities - International [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	2.00%	2.00%
Minimum [Member] | Fixed Income Investments - U.S. [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	40.00%	40.00%
Minimum [Member] | Hedge Funds [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	2.00%	2.00%
Minimum [Member] | Private equity [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	2.00%	2.00%
Minimum [Member] | Real assets [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	2.00%	2.00%
Minimum [Member] | Other investments [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%	0.00%
Minimum [Member] | Short-term Investments [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	1.00%	1.00%
Maximum [Member] | Equity Securities - U.S. [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10.00%	10.00%
Maximum [Member] | Equity Securities - International [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10.00%	10.00%
Maximum [Member] | Fixed Income Investments - U.S. [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	80.00%	80.00%
Maximum [Member] | Hedge Funds [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	8.00%	8.00%
Maximum [Member] | Private equity [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	8.00%	8.00%
Maximum [Member] | Real assets [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10.00%	10.00%
Maximum [Member] | Other investments [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	8.00%	8.00%
Maximum [Member] | Short-term Investments [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10.00%	10.00%