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Retirement Plans And Other Postretirement Benefits (Schedule Of Percentage Composition Of Assets Held By Pension Plans) (Details)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 100.00% 100.00% 100.00%
Fixed income securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 7.70% 8.70% 8.60%
Large/mid-capitalization equity securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 27.10% 21.30% 18.20%
Small-capitalization equity securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 8.60% 7.80% 6.80%
International and emerging market equity securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 20.60% 19.70% 16.00%
Total equity securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 56.30% 48.80% 41.00%
Private equity and hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 12.10% 35.00% 42.30%
Other assets      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 6.40% 6.10% 6.70%
Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 17.50% 1.40% 1.40%