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Leases, SoCF (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Lessee, Lease, Description [Line Items]      
Operating cash flows for operating leases $ 57 $ 53 $ 85
Operating cash flows for finance leases 42 39 33
Financing cash flows for finance leases 60 52 15
Lease assets obtained in exchange for lease obligations - finance 0 233 394
Lease assets obtained in exchange for lease obligations - operating $ 43 $ (22) $ 110