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Employee Benefits (Schedule Of Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Plan Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Year 1 $ 51
Year 2 53
Year 3 52
Year 4 52
Year 5 53
Years 6 to 10 265
Other Postretirement Plan Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Year 1 8
Year 2 8
Year 3 8
Year 4 8
Year 5 8
Years 6 to 10 $ 30