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Leases - Lease, Cost (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]      
Operating lease cost $ 352 $ 384 $ 399
Variable lease cost 165 130 145
Total lease costs $ 517 $ 514 $ 544