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Debt and Financing Arrangements - Short-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Sep. 30, 2022
Short-Term Debt [Line Items]    
Short-term debt $ 186 $ 669
Weighted average interest rate on short-term debt outstanding 3.80% 0.50%
Bank borrowings    
Short-Term Debt [Line Items]    
Short-term debt $ 23 $ 10
Commercial paper    
Short-Term Debt [Line Items]    
Short-term debt 0 172
Term loans    
Short-Term Debt [Line Items]    
Short-term debt $ 163 $ 487