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Inventories, Including Long-Term Mill and Leach Stockpiles (Unaudited) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Components of Inventories [Line Items]    
Raw materials (primarily concentrates) $ 247 $ 238
Work-in-process 188 [1] 199 [1]
Finished goods 1,269 [2] 1,146 [2]
Total product inventories 1,704 1,583
Mill and leach stockpiles 1,772 1,705
Total materials and supplies, net 1,744 [3] 1,730 [3]
Long-term mill and leach stockpiles 2,472 2,386
Inventory obsolescence reserves 21 24
Current [Member]
    
Components of Inventories [Line Items]    
Mill stockpiles 90 91
Leach stockpiles 1,682 1,614
Mill and leach stockpiles 1,772 1,705
Long-Term [Member]
    
Components of Inventories [Line Items]    
Mill stockpiles 730 698
Leach stockpiles 1,742 1,688
Long-term mill and leach stockpiles $ 2,472 [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 March 31, 2014, and $24 million at December 31, 2013.
[4] Estimated metals in stockpiles not expected to be recovered within the next 12 months.