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BUSINESS SEGMENTS INFORMATION (Business Segments Narrative) (Details) | 12 Months Ended
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Dec. 31, 2018
Workforce Subject to Collective Bargaining Arrangements |
Mining Segment Reporting Information [Line Items] |
Concentration risk percentage | 37.00%
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year |
Mining Segment Reporting Information [Line Items] |
Concentration risk percentage | 21.00%
North America | Inventory, Copper Metal Production | Product Concentration Risk | Morenci |
Mining Segment Reporting Information [Line Items] |
Concentration risk percentage | 49.00%
North America | Cost of Goods, Product Line | Supplier Concentration Risk | Atlantic Copper Smelting & Refining |
Mining Segment Reporting Information [Line Items] |
Concentration risk percentage | 14.00%
South America | Inventory, Copper Metal Production | Product Concentration Risk | Cerro Verde |
Mining Segment Reporting Information [Line Items] |
Concentration risk percentage | 84.00%
South America | Cost of Goods, Product Line | Supplier Concentration Risk | Atlantic Copper Smelting & Refining |
Mining Segment Reporting Information [Line Items] |
Concentration risk percentage | 5.00%
Indonesia | Cost of Goods, Product Line | Supplier Concentration Risk | Atlantic Copper Smelting & Refining |
Mining Segment Reporting Information [Line Items] |
Concentration risk percentage | 4.00%
PT Smelting |
Mining Segment Reporting Information [Line Items] |
Deferred intercompany profit | 25.00%
Morenci |
Mining Segment Reporting Information [Line Items] |
Ownership percentage | 72.00%

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