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Financial Instruments and Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration] Accounts payable Accounts payable
Research and development expense    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset impairment charges $ 30  
Integration and Restructuring Expense    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset impairment charges $ 24 $ 83
Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Maturity period of short-term investments at the time of purchase 3 months  
Supplier finance program, payment timing, period 90 days  
Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Maturity period of short-term investments at the time of purchase 1 year  
Supplier finance program, payment timing, period 150 days