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INVENTORIES (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials and work in process $ 11,757 $ 12,636
Finished goods 9,169 8,798
Unbilled shipments 481 536
Inventories, gross 21,407 21,971
Revaluation to LIFO 516 383
Total inventories $ 21,923 $ 22,354