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Inventories (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Inventory, Net [Abstract]    
Finished products $ 2,093 $ 2,189
Raw materials and work in process 655 724
Gross inventories 2,748 2,913
Less: excess of FIFO cost over LIFO cost (129) (173)
Total inventories $ 2,619 $ 2,740
Percent of LIFO inventories to total inventories 37.00% 35.00%