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Inventories (Tables)
12 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in millions):
 
September 30,
 
2018
 
2017
 
 
 
 
Raw materials and supplies
$
990

 
$
919

Work-in-process
545

 
567

Finished goods
1,689

 
1,723

Inventories
$
3,224

 
$
3,209