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Postretirement Plans (Schedule Of Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected future benefit payments, 2021 $ 4,959
Expected future benefit payments, 2022 4,825
Expected future benefit payments, 2023 4,720
Expected future benefit payments, 2024 4,657
Expected future benefit payments, 2025 4,581
Expected future benefit payments, 2026-2030 21,383
Other Postretirement Benefits Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Expected future benefit payments, 2021 430
Expected future benefit payments, 2022 420
Expected future benefit payments, 2023 403
Expected future benefit payments, 2024 384
Expected future benefit payments, 2025 364
Expected future benefit payments, 2026-2030 1,467
Gross benefits paid, 2021 462
Gross benefits paid, 2022 452
Gross benefits paid, 2023 435
Gross benefits paid, 2024 415
Gross benefits paid, 2025 394
Gross benefits paid, 2026-2030 1,606
Subsidies, 2021 (32)
Subsidies, 2022 (32)
Subsidies, 2023 (32)
Subsidies, 2024 (31)
Subsidies, 2025 (30)
Subsidies, 2026-2030 $ (139)