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Pension And Other Postretirement Benefits (Schedule Of Assumptions Used) (Details)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Defined Benefit Plan, Healthcare cost trend on covered charges 5.00%    
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Actuarial Present Value   5.00%  
Pension Benefits      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate   3.38% 4.31%
Rate of compensation increase   4.36% 4.49%
Postretirement Benefits      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate   3.19% 4.16%
Defined Benefit Plan, Healthcare cost trend on covered charges   5.00% 5.00%