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Leases, SoCF (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Lessee, Lease, Description [Line Items]      
Operating cash flows for operating leases $ 77 $ 57 $ 53
Operating cash flows for finance leases 43 42 39
Financing cash flows for finance leases 56 60 52
Lease assets obtained in exchange for lease obligations - finance 3 0 233
Lease assets obtained in exchange for lease obligations - operating $ 84 $ 43 $ (22)