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Inventories (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Inventories |  |
Raw materials | $ 68 | $ 66
Materials and supplies | 466 | 447
Finished goods | 858 | 776
Inventories, Gross | 1,392 | 1,289
Revaluation to LIFO | (45) | (43)
Total | $ 1,347 | $ 1,246

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