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Inventories
6 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Inventories
4. Inventories

Inventories consisted of the following:
(in millions)March 31,
2020
September 30,
2019
Raw materials and supplies$592  $609  
Work-in-process25  32  
Finished goods158  152  
Inventories$775  $793