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Inventories
12 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
4. Inventories

Inventories consisted of the following:
September 30,
(in millions)20202019
Raw materials and supplies$530 $609 
Work-in-process22 32 
Finished goods133 152 
Inventories$685 $793