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INVENTORIES, INCLUDING LONG-TERM MILL AND LEACH STOCKPILES | 12 Months Ended
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Dec. 31, 2017
Inventory Disclosure [Abstract] |
Inventories, Including Long-Term Mill And Leach Stockpiles | INVENTORIES, INCLUDING LONG-TERM MILL AND LEACH STOCKPILES The components of inventories follow:
| December 31, |
| 2017 |  | 2016 |
Current inventories: |  |  |  |
Total materials and supplies, net a | $ | 1,305 |  |  | $ | 1,306 |  |
Mill stockpiles | $ | 360 |  |  | $ | 259 |  |
Leach stockpiles | 1,062 |  |  | 1,079 |  |
Total current mill and leach stockpiles | $ | 1,422 |  |  | $ | 1,338 |  |
Raw materials (primarily concentrate) | $ | 265 |  |  | $ | 255 |  |
Work-in-process | 154 |  |  | 114 |  |
Finished goods | 747 |  |  | 629 |  |
Total product inventories | $ | 1,166 |  |  | $ | 998 |  |
Long-term inventories: |  |  |  |
Mill stockpiles | $ | 300 |  |  | $ | 487 |  |
Leach stockpiles | 1,109 |  |  | 1,146 |  |
Total long-term inventories b | $ | 1,409 |  |  | $ | 1,633 |  |
a. | Materials and supplies inventory was net of obsolescence reserves totaling $29 million at December 31, 2017 and 2016.
b. | Estimated metals in stockpiles not expected to be recovered within the next 12 months.
FCX recorded charges for adjustments to metals inventory carrying values of $8 million in 2017 and $36 million in 2016 (primarily for molybdenum inventories), and $338 million in 2015 ($215 million for copper inventories and $123 million for molybdenum inventories). Refer to Note 16 for metals inventory adjustments by business segment.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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