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Leases - Schedule of Supplemental Disclosures (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Leases [Abstract]    
Cash paid for amounts included in the measurement of operating lease liabilities $ 56 $ 58
Right-of-use assets obtained in exchange for operating lease obligations $ 77 $ 7