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Leases - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Lessee, Lease, Description [Line Items]      
Operating Lease, Weighted Average Remaining Lease Term 6 years 8 months 12 days    
Operating Lease, Weighted Average Discount Rate, Percent 3.20%    
Operating Lease, Cost $ 145 $ 138 $ 132
Gross Proceeds from Sale Leaseback Transaction     225
Other Operating Income (Expense)      
Lessee, Lease, Description [Line Items]      
Sale and Leaseback Transaction, Gain (Loss), Net     $ 158
Minimum      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 1 year    
Lessee, Operating Lease, Renewal Term     6 months
Minimum | Sale Leaseback Transaction, Term of Contract      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract     2 years
Maximum      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 25 years    
Lessee, Operating Lease, Renewal Term     12 months
Maximum | Sale Leaseback Transaction, Term of Contract      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract     3 years