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Retirement Benefits (Schedule Of Expected Payments From Qualified Trust And Company Funds) (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Pension Benefits | Paid From Qualified Trust  
Defined Benefit Plan Disclosure [Line Items]  
2016 $ 233
2017 244
2018 250
2019 257
2020 261
2021 - 2025 1,377
Pension Benefits | Paid From Company Funds  
Defined Benefit Plan Disclosure [Line Items]  
2016 3
2017 3
2018 3
2019 3
2020 3
2021 - 2025 13
Postretirement Benefits | Paid From Qualified Trust  
Defined Benefit Plan Disclosure [Line Items]  
2016 55
2017 58
2018 60
2019 62
2020 65
2021 - 2025 341
Postretirement Benefits | Paid From Company Funds  
Defined Benefit Plan Disclosure [Line Items]  
2016 2
2017 2
2018 2
2019 2
2020 2
2021 - 2025 $ 12