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Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Inventories
Finished goods	$ 836	$ 849	$ 808
Raw materials	134	125	119
Operating supplies	45	44	46
Inventories	$ 1,015	$ 1,018	$ 973

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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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