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Inventories (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Inventories
Finished goods	$ 838	$ 849	$ 821
Raw materials	131	125	123
Operating supplies	46	44	41
Inventories	$ 1,015	$ 1,018	$ 985

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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