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Inventories
3 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories
4. Inventories

Inventories consisted of the following:
(in millions)December 31, 2019September 30, 2019
Raw materials and supplies$586  $609  
Work-in-process29  32  
Finished goods157  152  
Inventories$772  $793