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Other Financial Information (Accrued Expenses) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Sep. 30, 2020
Accrued Liabilities and Other Liabilities [Abstract]    
Customer advances (contract liabilities) $ 749 $ 583
Employee compensation 516 577
Product warranty 152 148
Operating lease liabilities (current) $ 150 $ 148