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Inventories (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Inventories    
Raw materials $ 69 $ 63
Materials and supplies 433 414
Finished goods 772 636
Inventories, Gross 1,274 1,113
LIFO reserve (72) (72)
Total $ 1,202 $ 1,041