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Retirement Plans And Other Postretirement Benefits (Schedule Of Percentage Composition Of Assets Held By Pension Plans) (Details)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 8.00% 12.80% 14.50%
Large/mid-capitalization equity securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 14.70% 13.80% 13.70%
Small-capitalization equity securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 5.30% 4.00% 4.30%
International and emerging market equity securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 11.50% 10.90% 11.00%
Total equity securities      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 31.50% 28.70% 29.00%
Private equity and hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 48.40% 52.40% 51.20%
Other assets      
Defined Benefit Plan Disclosure [Line Items]      
% Composition of Plan Assets at December 31, Total for continuing operations 12.10% 6.10% 5.30%