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Leases - Schedule of Components of Lease Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Leases [Abstract]      
Operating lease cost $ 121 $ 111 $ 104
Finance lease cost:      
Amortization of ROU assets 5 4 3
Interest on lease liabilities 3 3 3
Variable lease cost 0 1 2
Short-term lease cost 6 10 4
Total lease cost 135 129 116
Cash paid related to lease liabilities:      
Operating cash flows — operating leases 119 109 103
Operating cash flows — finance leases 3 4 3
Financing cash flows — finance leases 3 2 1
Non-cash lease liability activities:      
ROU assets obtained in exchange for operating lease liabilities 40 84 136
ROU assets obtained in exchange for finance lease liabilities $ 2 $ 7 $ 6
Weighted-average remaining lease term (in years)      
Operating leases 6 years 3 months 18 days 6 years 9 months 18 days  
Finance leases 6 years 3 months 18 days 6 years 8 months 12 days  
Weighted-average discount rate (%)      
Operating leases 7.50% 4.80%  
Finance leases 6.50% 6.90%