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Pension Plans and Other Postretirement Benefits - Defined Benefit Plans Expected Benefit (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 423
2022 376
2023 375
2024 375
2025 375
2026-2030 1,807
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 13
2022 13
2023 13
2024 13
2025 13
2026-2030 $ 61