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Note 3. Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Inventory Disclosure [Abstract]    
Inventory, Raw Materials, Net of Reserves $ 552 $ 502
Inventory, Work in Process, Net of Reserves 37 35
Inventory, Finished Goods, Net of Reserves 146 123
Inventory, Net $ 735 $ 660