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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Inventories footnote [Abstract]    
Percentage Of LIFO Inventory To Total Inventory 22.00% 17.00%
Inventory, Net [Abstract]    
Raw materials, work-in-process and supplies $ 3,891 $ 2,847
Finished products 5,271 3,982
Total inventories under FIFO 9,162 6,829
Less: LIFO adjustment (954) (928)
Total inventories 8,208 5,901
Automotive [Member]
   
Inventory, Net [Abstract]    
Total inventories $ 8,208 $ 5,901