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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 30, 2017
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 1,006 $ 919
Work-in-process 543 567
Finished goods 1,910 1,723
Inventories $ 3,459 $ 3,209