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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Inventories      
Finished goods $ 1,014 $ 957 $ 1,061
Raw materials 124 137 126
Operating supplies 40 45 50
Inventories $ 1,178 $ 1,139 $ 1,237