v3.26.1
Debt and Financing Arrangements - Summary (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Sep. 30, 2025
Short-Term Debt [Line Items]    
Short-term debt $ 882 $ 723
Weighted average interest rate on short-term debt outstanding 3.40% 4.50%
Commercial paper    
Short-Term Debt [Line Items]    
Short-term debt $ 441 $ 400
Term loans    
Short-Term Debt [Line Items]    
Short-term debt 437 320
Bank borrowings    
Short-Term Debt [Line Items]    
Short-term debt $ 4 $ 3