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Leases - Supplemental Cash Flow Information, Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liability:      
Operating cash outflows from operating leases $ 367 $ 398 $ 397
Noncash operating lease activity:      
Right-of-use assets obtained in exchange for operating lease liabilities $ 369 $ 515 $ 467