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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Inventories      
Finished goods $ 873 $ 884 $ 954
Raw materials 114 110 116
Operating supplies 36 41 42
Inventories $ 1,023 $ 1,035 $ 1,112