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Inventories (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Inventory, Net [Abstract]    
Finished products $ 2,557 $ 2,093
Raw materials and work in process 663 655
Gross inventories 3,220 2,748
Less: excess of FIFO cost over LIFO cost (124) (129)
Total inventories $ 3,096 $ 2,619
Percentage of LIFO Inventory 37.00% 37.00%