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Retirement Plans (Schedule Of Expected Benefit Payments For OPEB) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
OPEB, Gross Benefits [Member]  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2020 $ 43
2021 49
2022 49
2023 48
2024 53
2025 - 2029 274
Total 516
Medicare Part D Subsidy [Member]  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2025 - 2029 2
Total 2
Postretirement Benefits Other Than Pensions (OPEB) [Member]  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]  
2020 43
2021 49
2022 49
2023 48
2024 53
2025 - 2029 276
Total $ 518