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Debt and Financing Arrangements - Short-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Short-term Debt [Line Items]    
Short-term debt $ 953 $ 361
Weighted average interest rate on short-term debt outstanding 4.80% 4.90%
Term loans    
Short-term Debt [Line Items]    
Short-term debt $ 603 $ 159
Commercial paper    
Short-term Debt [Line Items]    
Short-term debt 350 200
Bank borrowings    
Short-term Debt [Line Items]    
Short-term debt $ 0 $ 2