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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, 2024
Sep. 30, 2023
Sep. 30, 2022
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenues $ 3,994 $ 3,931 $ 4,321
Net property, plant and equipment 1,534 1,412  
United States [Member]      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenues 733 738 842
Net property, plant and equipment 643 588  
China [Member]      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenues 983 972 1,129
Net property, plant and equipment 371 356  
Other Countries [Member]      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenues 2,278 2,221 $ 2,350
Net property, plant and equipment $ 520 $ 468