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Leases - Maturities of Operating Lease Liabilities (Details)
$ in Millions
Sep. 30, 2020
USD ($)
Leases [Abstract]  
2021 $ 112
2022 82
2023 65
2024 47
2025 37
Thereafter 65
Total lease payments 408
Less: imputed interest (69)
Operating lease, liability $ 339