v3.23.3
Leases - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Lessee, Lease, Description [Line Items]      
Renewal term (in years) 5 years    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets  
ROU assets $ 488 $ 480  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued liabilities Accrued liabilities  
Current portion of lease liabilities $ 106 $ 98  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other liabilities Other liabilities  
Noncurrent portion of lease liabilities $ 412 $ 422  
Operating lease cost $ 129 $ 117 $ 111
Weighted average remaining lease term (in years) 6 years 6 years  
Weighted average discount rate 2.43% 2.15%  
Right-of-use asset obtained in exchange for operating lease liability $ 82 $ 74 $ 96
Operating leases, not yet commenced, lease obligations $ 433    
Minimum      
Lessee, Lease, Description [Line Items]      
Operating leases, non-cancellable lease terms 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Operating leases, non-cancellable lease terms 14 years