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Leases - Lease, Cost (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Leases [Abstract]      
Operating lease cost $ 381 $ 374 $ 365
Variable lease cost 153 170 154
Total lease costs $ 534 $ 544 $ 519