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Inventories
6 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories are stated at the lower of cost (using FIFO or average methods) or market (determined on the basis of estimated realizable values) and are summarized as follows (in millions):
 
March 31,
2020
 
September 30,
2019
Finished goods
$
139

 
$
153

Work in process
46

 
39

Raw materials, parts and supplies
344

 
334

Total
$
529

 
$
526