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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Inventories      
Finished goods $ 1,032 $ 958 $ 1,006
Raw materials 127 113 125
Operating supplies 45 46 44
Inventories $ 1,204 $ 1,117 $ 1,175