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Employee Benefits (Schedule Of Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Year 1 $ 45
Year 2 45
Year 3 47
Year 4 46
Year 5 47
Years 6 to 10 234
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Year 1 8
Year 2 8
Year 3 8
Year 4 7
Year 5 7
Years 6 to 10 $ 18