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Benefit Plans - Estimated future benefit payments (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension benefits  
Estimated future benefit payments  
2019 $ 600
2020 629
2021 636
2022 634
2023 626
2025-2029 2,401
Total benefit payments 5,526
Postretirement benefits  
Estimated future benefit payments  
2019 23
2020 24
2021 26
2022 27
2023 27
2025-2029 136
Total benefit payments $ 263