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Leases, SoCF (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2020
USD ($)
Lessee, Lease, Description [Line Items]  
Operating cash flows for operating leases $ 85
Operating cash flows for finance leases 33
Financing cash flows for finance leases 15
Lease assets obtained in exchange for lease obligations - finance 394
Lease assets obtained in exchange for lease obligations - operating $ 110