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Postretirement Plans (Schedule Of Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected future benefit payments, 2017 $ 4,558
Expected future benefit payments, 2018 4,622
Expected future benefit payments, 2019 4,611
Expected future benefit payments, 2020 4,662
Expected future benefit payments, 2021 4,637
Expected future benefit payments, 2022-2026 23,108
Other Postretirement Benefits Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected future benefit payments, 2017 466
Expected future benefit payments, 2018 484
Expected future benefit payments, 2019 499
Expected future benefit payments, 2020 517
Expected future benefit payments, 2021 523
Expected future benefit payments, 2022-2026 2,511
Gross benefits paid, 2017 498
Gross benefits paid, 2018 515
Gross benefits paid, 2019 530
Gross benefits paid, 2020 548
Gross benefits paid, 2021 553
Gross benefits paid, 2022-2026 2,654
Subsidies, 2017 (32)
Subsidies, 2018 (31)
Subsidies, 2019 (31)
Subsidies, 2020 (31)
Subsidies, 2021 (30)
Subsidies, 2022-2026 $ (143)