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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Inventories    
Raw materials $ 70 $ 69
Materials and supplies 475 443
Finished goods 803 655
Inventories, Gross 1,348 1,167
LIFO reserve (98) (98)
Total $ 1,250 $ 1,069