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Inventories (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | ---
Inventories |  |  |
Finished goods | $ 892 | $ 858 | $ 873
Raw materials | 127 | 113 | 114
Operating supplies | 38 | 36 | 36
Inventories | $ 1,057 | $ 1,007 | $ 1,023

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