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Inventories (Tables)
6 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in millions):
March 31, 2021September 30, 2020
Raw materials and supplies$676 $629 
Work-in-process175 142 
Finished goods1,143 1,002 
Inventories$1,994 $1,773