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Inventories (Schedule of Inventory) (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Inventory, Net [Abstract]    
Finished products $ 2,516 $ 2,189
Raw materials and work in process 724 724
Gross inventories 3,240 2,913
Less: excess of FIFO cost over LIFO cost (154) (173)
Total inventories $ 3,086 $ 2,740
Percentage of LIFO Inventory 36.00% 35.00%