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Retirement Benefits (Schedule Of Expected Payments From Qualified Trust And Company Funds) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Pension Benefits | Paid From Qualified Trust  
Defined Benefit Plan Disclosure [Line Items]  
2017 $ 248
2018 254
2019 261
2020 265
2021 273
2022 - 2026 1,405
Pension Benefits | Paid From Company Funds  
Defined Benefit Plan Disclosure [Line Items]  
2017 3
2018 3
2019 3
2020 3
2021 3
2022 - 2026 13
Postretirement Benefits | Paid From Qualified Trust  
Defined Benefit Plan Disclosure [Line Items]  
2017 54
2018 57
2019 59
2020 61
2021 63
2022 - 2026 331
Postretirement Benefits | Paid From Company Funds  
Defined Benefit Plan Disclosure [Line Items]  
2017 2
2018 2
2019 2
2020 2
2021 2
2022 - 2026 $ 12