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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Inventory    
Raw materials and work in process $ 13,917 $ 13,415
Finished goods 9,387 8,265
Unbilled shipments 500 628
Inventory, Gross, Total 23,804 22,308
Revaluation to LIFO 312 207
Total inventories $ 24,116 $ 22,515