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Leases - Additional Information (Details)
$ in Millions
12 Months Ended
Sep. 30, 2020
USD ($)
Lessee, Lease, Description [Line Items]  
Extended lease term 10 years
Lessee, operating lease, termination period 1 year
Operating lease liabilities $ 338
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 11 years