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Leases - Supplemental Disclosures (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]    
Cash paid for amounts included in the measurement of operating lease liabilities $ 59 $ 55
Right-of-use assets obtained in exchange for operating lease obligations $ 25 $ 14