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Pension Plans and Other Postretirement Benefits - Defined Benefit Plans Expected Benefit (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 373
2021 415
2022 379
2023 384
2024 380
2025-2029 1,851
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 15
2021 15
2022 15
2023 15
2024 15
2025-2029 $ 72