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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventory, Net [Abstract]    
Finished products $ 2,524 $ 2,374
Raw materials and work in process 634 725
Gross inventories 3,158 3,099
Less: excess of FIFO cost over LIFO cost (126) (111)
Total inventories $ 3,032 $ 2,988
Percentage of LIFO Inventory 43.00% 38.00%