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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Inventories footnote [Abstract]    
Inventories under LIFO, Ratio 32.00% 32.00%
Inventory, Net [Abstract]    
Raw materials, work-in-process and supplies $ 2,847 $ 2,812
Finished products 3,982 3,970
Total inventories under FIFO 6,829 6,782
Less: LIFO adjustment (928) (865)
Total inventories 5,901 5,917
Automotive [Member]
   
Inventory, Net [Abstract]    
Total inventories $ 5,901 $ 5,917