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Retirement Benefits (Schedule Of Expected Payments From Qualified Trust And Company Funds) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Benefits | Paid From Qualified Trust  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 267
2020 272
2021 282
2022 285
2023 286
2024 - 2028 1,439
Pension Benefits | Paid From Company Funds  
Defined Benefit Plan Disclosure [Line Items]  
2019 3
2020 3
2021 3
2022 3
2023 3
2024 - 2028 12
Postretirement Benefits | Paid From Qualified Trust  
Defined Benefit Plan Disclosure [Line Items]  
2019 57
2020 59
2021 61
2022 62
2023 64
2024 - 2028 315
Postretirement Benefits | Paid From Company Funds  
Defined Benefit Plan Disclosure [Line Items]  
2019 2
2020 2
2021 2
2022 2
2023 2
2024 - 2028 $ 12