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Note 3. Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 30, 2017
Inventory Disclosure [Abstract]    
Inventory, Raw Materials, Net of Reserves $ 559 $ 552
Inventory, Work in Process, Net of Reserves 41 37
Inventory, Finished Goods, Net of Reserves 162 146
Inventory, Net $ 762 $ 735