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Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
--- | --- | --- | ---
Inventories |  |  |
Finished goods | $ 954 | $ 858 | $ 858
Raw materials | 116 | 113 | 109
Operating supplies | 37 | 36 | 40
Inventories | $ 1,107 | $ 1,007 | $ 1,007

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