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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Lessee, Lease, Description [Line Items]      
Operating Lease, Weighted Average Remaining Lease Term 6 years 9 months 18 days    
Operating Lease, Weighted Average Discount Rate, Percent 2.30%    
Operating Lease, Cost $ 138 $ 132 $ 131
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