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Retirement Plans And Other Postretirement Benefits (Schedule Of Targeted Allocation Percentage For Pension Plan Assets And Expected Long-Term Rate Of Return On Assets) (Details)
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]  
Target % Composition of Plan Assets, Total for continuing operations 100.00%
Expected Long-term Return %, Total for continuing operations 5.00%
Fixed income securities  
Defined Benefit Plan Disclosure [Line Items]  
Target % Composition of Plan Assets, Total for continuing operations 12.00%
Expected Long-term Return %, Total for continuing operations 1.30%
Large/mid-capitalization equity securities  
Defined Benefit Plan Disclosure [Line Items]  
Target % Composition of Plan Assets, Total for continuing operations 27.00%
Expected Long-term Return %, Total for continuing operations 6.30%
Small-capitalization equity securities  
Defined Benefit Plan Disclosure [Line Items]  
Target % Composition of Plan Assets, Total for continuing operations 8.00%
Expected Long-term Return %, Total for continuing operations 6.80%
International and emerging market equity securities  
Defined Benefit Plan Disclosure [Line Items]  
Target % Composition of Plan Assets, Total for continuing operations 20.00%
Expected Long-term Return %, Total for continuing operations 5.60%
Total equity securities  
Defined Benefit Plan Disclosure [Line Items]  
Target % Composition of Plan Assets, Total for continuing operations 55.00%
Expected Long-term Return %, Total for continuing operations 6.10%
Private equity and hedge funds  
Defined Benefit Plan Disclosure [Line Items]  
Target % Composition of Plan Assets, Total for continuing operations 33.00%
Expected Long-term Return %, Total for continuing operations 4.40%