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Employee Benefit Plans - Schedule of Future Expected Benefit Payments (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure  
2020 $ 136
2021 134
2022 136
2023 137
2024 142
2025-2029 749
Other Postretirement Benefits  
Defined Benefit Plan Disclosure  
2020 11
2021 9
2022 7
2023 6
2024 6
2025-2029 $ 24