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Employee Benefit Plans (Schedule Of Target Asset Allocations) (Details)
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations 100.00% 100.00%
Cash And Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations 0.00% 4.20%
Domestic equities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations 31.70% 46.10%
Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations 57.70% 45.80%
Other Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations 10.60% 3.90%