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Retirement Benefits (Schedule Of Expected Payments From Qualified Trust And Company Funds) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Benefits | Paid From Qualified Trust  
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 255
2019 261
2020 266
2021 277
2022 280
2023 - 2027 1,421
Pension Benefits | Paid From Company Funds  
Defined Benefit Plan Disclosure [Line Items]  
2018 3
2019 3
2020 3
2021 3
2022 3
2023 - 2027 13
Postretirement Benefits | Paid From Qualified Trust  
Defined Benefit Plan Disclosure [Line Items]  
2018 57
2019 59
2020 62
2021 64
2022 65
2023 - 2027 331
Postretirement Benefits | Paid From Company Funds  
Defined Benefit Plan Disclosure [Line Items]  
2018 2
2019 2
2020 2
2021 2
2022 2
2023 - 2027 $ 12