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Commitments and Contingencies Future Minimum Rental Commitments (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Future minimum rental commitments on noncancelable leases due in 2020 $ 122
Future minimum rental commitments on noncancelable leases due in 2021 103
Future minimum rental commitments on noncancelable leases due in 2022 83
Future minimum rental commitments on noncancelable leases due in 2023 57
Future minimum rental commitments on noncancelable leases due in 2024 56
Future minimum rental commitments on noncancelable leases thereafter $ 123