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Inventories (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventories
Finished goods	$ 884us-gaap_InventoryFinishedGoodsNetOfReserves	$ 958us-gaap_InventoryFinishedGoodsNetOfReserves
Raw materials	110us-gaap_InventoryRawMaterialsNetOfReserves	113us-gaap_InventoryRawMaterialsNetOfReserves
Operating supplies	41us-gaap_InventorySuppliesNetOfReserves	46us-gaap_InventorySuppliesNetOfReserves
Inventories	$ 1,035us-gaap_InventoryNet	$ 1,117us-gaap_InventoryNet

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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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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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