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Benefit Plans - Estimated future benefit payments (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Pension benefits |
Estimated future benefit payments |
2019 | $ 448
2020 | 462
2021 | 495
2022 | 509
2023 | 528
2024-2028 | 2,383
Total benefit payments | 4,825
Postretirement benefits |
Estimated future benefit payments |
2019 | 24
2020 | 25
2021 | 26
2022 | 27
2023 | 28
2024-2028 | 142
Total benefit payments | $ 272

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