v3.26.3
Restructuring Charges - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges $ 25 $ (5) $ 97
Expected restructuring charges 115    
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges     $ 22
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]     Cost of Product and Service Sold
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges     $ 9
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]     Selling, General and Administrative Expense
Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges     $ 66
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]     Selling, General and Administrative Expense
Severance Benefits      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges 25 (5) $ 92
Severance Benefits | Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges $ 4    
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Product and Service Sold    
Severance Benefits | Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges $ 21    
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, General and Administrative Expense    
Other      
Restructuring Cost and Reserve [Line Items]      
Restructuring Charges $ 0 $ 0 $ 5