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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Inventory, Net [Abstract]    
Finished products $ 2,880 $ 3,113
Semi-finished products 1,424 2,009
Raw materials, stores and supplies 713 719
Total inventories before LIFO adjustment 5,017 5,841
Adjustment of inventories to a last-in, first-out (LIFO) basis (161) (168)
Total $ 4,856 $ 5,673