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Inventories (Tables)
12 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in millions):
 September 30,
 20202019
Raw materials and supplies$629 $588 
Work-in-process142 176 
Finished goods1,002 1,050 
Inventories$1,773 $1,814