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Restructuring - Recorded Restructuring Activities (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]      
Total $ 11 $ 13 $ 4
Cost of Sales [Member]      
Restructuring Cost and Reserve [Line Items]      
Total 6 12 $ 4
Selling and Administrative Expenses [Member]      
Restructuring Cost and Reserve [Line Items]      
Total 3 $ 1  
Research and Technical Expenses [Member]      
Restructuring Cost and Reserve [Line Items]      
Total $ 2