v3.20.4
Pension And Postretirement Benefits (Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 5,391
2022 4,597
2023 4,428
2024 4,323
2025 4,234
Years 2026 - 2030 19,646
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 1,392
2022 1,231
2023 1,159
2024 879
2025 832
Years 2026 - 2030 $ 3,651