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INVENTORIES, INCLUDING LONG-TERM MILL AND LEACH STOCKPILES (Tables) | 12 Months Ended
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Dec. 31, 2017
Inventory Disclosure [Abstract] |
Schedule of Inventory, Noncurrent | 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.
Components of Inventories | 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.

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- Definition Tabular disclosure of the carrying 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle including inventoried costs relating to long-term contracts or programs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(d)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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