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Inventories
12 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
4. Inventories

Inventories consisted of the following:
September 30,
(in millions)2019  2018  
Raw materials and supplies$609  $626  
Work-in-process32  38  
Finished goods152  160  
Inventories$793  $824