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Inventories (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Inventory, Net [Abstract]    
Finished products $ 2,729 $ 2,070
Raw materials and work in process 715 651
Gross inventories 3,444 2,721
Less: excess of FIFO cost over LIFO cost (99) (98)
Total inventories $ 3,345 $ 2,623
Percentage of LIFO Inventory 37.00% 37.00%