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Financial Information by Segment & Geographic Area - Revenue from External Customers and Property, Plant and Equipment Information by Geographic Area (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenues $ 3,931 $ 4,321 $ 3,409
Net property, plant and equipment 1,412 1,270  
United States [Member]      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenues 738 842 668
Net property, plant and equipment 588 524  
China [Member]      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenues 972 1,129 858
Net property, plant and equipment 356 333  
Other Countries [Member]      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenues 2,221 2,350 $ 1,883
Net property, plant and equipment $ 468 $ 413