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Leases - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Lessee, Lease, Description [Line Items]    
Extended lease term 10 years  
Lessee, operating lease, termination period 1 year  
Operating lease liabilities $ 330 $ 338
Operating lease expense 16 $ 18
Affiliated entity    
Lessee, Lease, Description [Line Items]    
Operating lease liabilities $ 125  
Minimum    
Lessee, Lease, Description [Line Items]    
Lessee, operating lease, term of contract 1 year  
Maximum    
Lessee, Lease, Description [Line Items]    
Lessee, operating lease, term of contract 21 years