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Benefit Plans (Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 495
2022 483
2023 483
2024 483
2025 485
2026-2030 2,437
Postretirement Benefit Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 120
2022 118
2023 115
2024 113
2025 112
2026-2030 $ 563