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Leases Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Operating leases, weighted-average remaining term 5 years 9 months 18 days 4 years 7 months 6 days
Operating leases, weighted-average discount rate 2.60% 2.80%
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accrued expenses Accrued expenses
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other liabilities Other liabilities
Other Assets [Member]    
Operating lease right-of-use assets $ 558 $ 508
Other Current Liabilities [Member]    
Current lease liabilities (Accrued expenses) 155 148
Other Liabilities [Member]    
Noncurrent lease liabilities (Other liabilities) $ 413 $ 373