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Summary of Significant Accounting Policies - Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Leases      
Finance lease under PPA $ 390 $ 425  
Operating lease under PPA 135 133  
Operating cash flows for operating leases $ 77 $ 57 $ 53