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Pension Plans and Other Postretirement Plans - Defined Benefit Plans Expected Benefit (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2019 $ 375
2020 387
2021 411
2022 387
2023 391
2024-2028 1,916
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2019 17
2020 17
2021 17
2022 16
2023 16
2024-2028 $ 76