Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Components of Inventories [Line Items]
Raw materials (primarily concentrates)	$ 297		$ 238
Work-in-process	154	[1]	199	[1]
Finished goods	1,214	[2]	1,146	[2]
Total product inventories	1,665		1,583
Mill and leach stockpiles	1,880		1,705
Total materials and supplies, net	1,825	[3]	1,730	[3]
Long-term mill and leach stockpiles	2,518		2,386
Inventory obsolescence reserves	21		24
Current [Member]
Components of Inventories [Line Items]
Mill stockpiles	104		91
Leach stockpiles	1,776		1,614
Mill and leach stockpiles	1,880		1,705
Long-Term [Member]
Components of Inventories [Line Items]
Mill stockpiles	753		698
Leach stockpiles	1,765		1,688
Long-term mill and leach stockpiles	$ 2,518	[4]	$ 2,386	[4]

[1] FCX's mining operations also have work-in-process inventories that are reflected as mill and leach stockpiles.

[2] Primarily included molybdenum concentrates; copper concentrates, anodes, cathodes and rod; and various cobalt products.

[3] Materials and supplies inventory was net of obsolescence reserves totaling $21 million at June 30, 2014, and $24 million at December 31, 2013.

[4] Estimated metals in stockpiles not expected to be recovered within the next 12 months.