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Financial Information by Segment & Geographic Area - Schedule of Details of Certain Items (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]      
Indirect tax settlement charges $ (7)    
Loss on sale of business     $ (3)
Certain Items [Member]      
Segment Reporting Information [Line Items]      
Global restructuring activities (11) $ (13) (4)
Indirect tax settlement charges (7)    
Legal and environmental matters and reserves (7) (2) (10)
Employee benefit plan settlement and other charges (3)    
Acquisition and integration-related charges (1)   (4)
Loss on sale of business     (3)
Other certain items (1) (1) (1)
Total certain items $ (30) (59) (29)
Certain Items [Member] | Argentina [Member]      
Segment Reporting Information [Line Items]      
Currency devaluation and other losses   $ (43) $ (7)