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Postretirement Plans (Schedule Of Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected future benefit payments, 2018 $ 4,758
Expected future benefit payments, 2019 4,712
Expected future benefit payments, 2020 4,740
Expected future benefit payments, 2021 4,703
Expected future benefit payments, 2022 4,631
Expected future benefit payments, 2023-2027 22,770
Other Postretirement Benefits Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected future benefit payments, 2018 480
Expected future benefit payments, 2019 491
Expected future benefit payments, 2020 500
Expected future benefit payments, 2021 503
Expected future benefit payments, 2022 499
Expected future benefit payments, 2023-2027 2,277
Gross benefits paid, 2018 496
Gross benefits paid, 2019 507
Gross benefits paid, 2020 517
Gross benefits paid, 2021 520
Gross benefits paid, 2022 516
Gross benefits paid, 2023-2027 2,364
Subsidies, 2018 (16)
Subsidies, 2019 (16)
Subsidies, 2020 (17)
Subsidies, 2021 (17)
Subsidies, 2022 (17)
Subsidies, 2023-2027 $ (87)