Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Components of Inventories [Line Items]
Total product inventories	$ 1,231		$ 1,409
Total materials and supplies, net	1,323	[1]	1,169	[1]
Total inventories, less current portion of mill and leach stockpiles	2,554		2,578
Inventory obsolescence reserves	26		26
Mining Operations [Member]
Components of Inventories [Line Items]
Raw materials (concentrates)	1		1
Work-in-process	77		93
Finished goods	758	[2]	704	[2]
Atlantic Copper [Member]
Components of Inventories [Line Items]
Raw materials (concentrates)	146		336
Work-in-process	247		266
Finished goods	$ 2		$ 9

[1] Materials and supplies inventory is net of obsolescence reserves totaling $26 million at September 30, 2011, and December 31, 2010.

[2] Primarily includes molybdenum concentrates, and copper concentrates, anodes, cathodes and rod.