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Employee Benefit Plans - Schedule of Future Benefit Payments (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Pension benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 143
2021 143
2022 143
2023 142
2024 140
2025 - 2029 688
Total 1,399
Other postretirement benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 6
2021 5
2022 4
2023 4
2024 3
2025 - 2029 15
Total $ 37