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Summary of Significant Accounting Policies - Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Leases      
Finance lease under PPA $ 550 $ 390  
Operating lease under PPA 121 135  
Operating cash flows for operating leases 78 $ 77 $ 57
Finance Lease, Liability, Payment, Due $ 1,133