v3.21.2
Leases - Additional Information (Details)
$ in Millions
12 Months Ended
Sep. 30, 2021
USD ($)
option_to_renew
Sep. 30, 2020
USD ($)
Lessee, Lease, Description [Line Items]    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
ROU assets $ 515 $ 508
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued liabilities Accrued liabilities
Current portion of lease liabilities $ 103 $ 97
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other liabilities Other liabilities
Noncurrent portion of lease liabilities $ 471 $ 473
Operating lease cost $ 111 $ 114
Weighted average remaining lease term (in years) 6 years 6 years
Weighted average discount rate 2.23% 2.29%
Right-of-use asset obtained in exchange for operating lease liability $ 96 $ 76
Operating leases, not yet commenced, lease obligations $ 467  
Minimum    
Lessee, Lease, Description [Line Items]    
Number of renewal options | option_to_renew 1  
Operating leases, non-cancellable lease terms 1 year  
Maximum    
Lessee, Lease, Description [Line Items]    
Operating leases, non-cancellable lease terms 15 years