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Inventories (Schedule of Inventory) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Inventory, Net [Abstract]    
Finished products $ 2,082 $ 1,948
Raw materials and work in process 596 596
Gross inventories 2,678 2,544
Less: excess of FIFO cost over LIFO cost (173) (190)
Total inventories $ 2,505 $ 2,354
LIFO Method Related Items [Abstract]    
Percentage of LIFO Inventory 39.00% 40.00%