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Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 71 | $ 74
Materials and supplies | 470 | 445
Finished goods | 990 | 788
Inventories, gross | 1,531 | 1,307
Revaluation to LIFO | (47) | (47)
Total | $ 1,484 | $ 1,260

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