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Leases, SoCF (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Lessee, Lease, Description [Line Items]      
Operating cash flows for operating leases $ 78 $ 77 $ 57
Operating cash flows for finance leases 37 43 42
Financing cash flows for finance leases 76 56 60
Lease assets obtained in exchange for lease obligations - finance 230 3 0
Lease assets obtained in exchange for lease obligations - operating $ 115 $ 84 $ 43