Supplemental Data (Summary of Inventories) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventory [Line Items]
Raw materials	$ 426us-gaap_InventoryRawMaterials	$ 462us-gaap_InventoryRawMaterials
Work in process	215us-gaap_InventoryWorkInProcess	286us-gaap_InventoryWorkInProcess
Finished goods	1,183us-gaap_InventoryFinishedGoods	1,401us-gaap_InventoryFinishedGoods
Supplies and other	288us-gaap_OtherInventorySupplies	326us-gaap_OtherInventorySupplies
Gross inventories	2,112us-gaap_InventoryGross	2,475us-gaap_InventoryGross
Excess of FIFO or weighted-average cost over LIFO cost	(220)us-gaap_InventoryLIFOReserve	(242)us-gaap_InventoryLIFOReserve
Total	1,892us-gaap_InventoryNet	2,233us-gaap_InventoryNet
LIFO
Inventory [Line Items]
Raw materials	104	143
Work in process	120	189
Finished goods	511	648
Supplies and other	0	0
Gross inventories	735	980
Excess of FIFO or weighted-average cost over LIFO cost	(220)	(242)
Total	515	738
Non- LIFO
Inventory [Line Items]
Raw materials	322	319
Work in process	95	97
Finished goods	672	753
Supplies and other	288	326
Gross inventories	1,377	1,495
Excess of FIFO or weighted-average cost over LIFO cost	0	0
Total	$ 1,377	$ 1,495

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost.

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

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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