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Postretirement Plans (Schedule Of Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected future benefit payments, 2018 $ 4,711
Expected future benefit payments, 2019 4,706
Expected future benefit payments, 2020 4,684
Expected future benefit payments, 2021 4,630
Expected future benefit payments, 2022 4,575
Expected future benefit payments, 2023-2027 22,171
Other Postretirement Benefits Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected future benefit payments, 2018 469
Expected future benefit payments, 2019 469
Expected future benefit payments, 2020 460
Expected future benefit payments, 2021 458
Expected future benefit payments, 2022 447
Expected future benefit payments, 2023-2027 1,976
Gross benefits paid, 2018 486
Gross benefits paid, 2019 486
Gross benefits paid, 2020 477
Gross benefits paid, 2021 476
Gross benefits paid, 2022 465
Gross benefits paid, 2023-2027 2,066
Subsidies, 2018 (17)
Subsidies, 2019 (17)
Subsidies, 2020 (17)
Subsidies, 2021 (18)
Subsidies, 2022 (18)
Subsidies, 2023-2027 $ (90)