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Pension and Other Postretirement Benefits (Schedule Of Key Assumptions That Were Used To Calculate The Net Periodic Benefits Cost) (Details)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Expected Long-Term Rate of Return on Plan Assets 7.00%    
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discount Rate 3.79% [1] 4.40% 4.24% [1]
Defined Benefit Plan Assumptions Used In Calculating Net Periodic Cost Discount Rate for Interest Cost 3.15% [1] 3.31% 4.24% [1]
Expected Long-Term Rate of Return on Plan Assets 7.00% 7.25% 8.00%
Rate of Compensation Increases 4.00% 4.00% 4.00%
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Discount Rate [1] 3.89% 4.58% 4.33%
Defined Benefit Plan Assumptions Used In Calculating Net Periodic Cost Discount Rate for Interest Cost [1] 3.27% 3.48% 4.33%
Expected Long-Term Rate of Return on Plan Assets 5.80% 6.99% 7.85%
Rate of Compensation Increases 0.00% 0.00% 0.00%
[1] In January 2017, we changed the method used to estimate the service and interest components of net periodic benefit cost for pension and other postretirement benefits. This change, compared to the previous method, resulted in a decrease in the actuarially-determined service and interest cost components. Historically, we estimated service and interest cost utilizing a single weighted-average discount rate derived from the yield curve used to measure the benefit obligation at the beginning of the period. For fiscal 2017 and beyond, we now utilize a full yield curve approach to estimate these components by applying the specific spot rates along the yield curve used in the determination of the benefit obligation to the relevant projected cash flows.