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Other Financial Information (Accrued Expenses) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Sep. 30, 2021
Accrued Liabilities and Other Liabilities [Abstract]    
Customer advances (contract liabilities) $ 886 $ 730
Employee compensation $ 574 690
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accrued expenses  
Operating lease liabilities (current) $ 154 155
Product warranty $ 119 $ 146