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Employee Benefit Plans (Schedule Of Target Asset Allocations) (Details)
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations 100.00% 100.00%
Domestic equities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations 31.60% 31.70%
Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations 62.60% 57.70%
Other Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations 5.80% 10.60%