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Postretirement Plans (Schedule Of Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected future benefit payments, 2018 $ 4,838
Expected future benefit payments, 2019 4,808
Expected future benefit payments, 2020 4,744
Expected future benefit payments, 2021 4,650
Expected future benefit payments, 2022 4,608
Expected future benefit payments, 2023-2027 21,757
Other Postretirement Benefits Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected future benefit payments, 2018 461
Expected future benefit payments, 2019 452
Expected future benefit payments, 2020 444
Expected future benefit payments, 2021 432
Expected future benefit payments, 2022 417
Expected future benefit payments, 2023-2027 1,774
Gross benefits paid, 2018 479
Gross benefits paid, 2019 470
Gross benefits paid, 2020 462
Gross benefits paid, 2021 450
Gross benefits paid, 2022 435
Gross benefits paid, 2023-2027 1,867
Subsidies, 2018 (18)
Subsidies, 2019 (18)
Subsidies, 2020 (18)
Subsidies, 2021 (18)
Subsidies, 2022 (18)
Subsidies, 2023-2027 $ (93)