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Inventories (Schedule of Inventory) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory, Net [Abstract]    
Finished products $ 2,195 $ 1,950
Raw materials and work in process 631 622
Gross inventories 2,826 2,572
Less: excess of FIFO cost over LIFO cost (160) (164)
Total inventories $ 2,666 $ 2,408
LIFO Method Related Items [Abstract]    
Percentage of LIFO Inventory 41.00% 39.00%