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Inventories
9 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
4. Inventories

Inventories consisted of the following:
(in millions)
 
June 30,
2019
 
September 30, 2018
Raw materials and supplies
 
$
601

 
$
626

Work-in-process
 
33

 
38

Finished goods
 
149

 
160

Inventories
 
$
783

 
$
824