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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Inventories footnote [Abstract]    
Inventories under LIFO, Ratio 36.00% 32.00%
Inventory, Net [Abstract]    
Raw materials, work-in-process and supplies $ 3,409 $ 2,847
Finished products 4,559 3,982
Total inventories under FIFO 7,968 6,829
Less: LIFO adjustment (937) (928)
Total inventories 7,031 5,901
Automotive [Member]
   
Inventory, Net [Abstract]    
Total inventories $ 7,031 $ 5,901