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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Inventories      
Finished goods $ 892 $ 858 $ 842
Raw materials 121 113 103
Operating supplies 38 36 40
Inventories $ 1,051 $ 1,007 $ 985