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Pensions and Other Postretirement Benefits - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 147
2022 146
2023 145
2024 145
2025 144
Years 2026 – 2030 719
OPEB  
Defined Benefit Plan Disclosure [Line Items]  
2021 36
2022 35
2023 33
2024 32
2025 31
Years 2026 – 2030 $ 142