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BUSINESS SEGMENTS INFORMATION (Business Segments Narrative) (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Workforce Subject to Collective Bargaining Arrangements |  |  |
Mining Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 38.00% |  |
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year |  |  |
Mining Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 16.00% |  |
North America | Inventory, Copper Metal Production | Product Concentration Risk | Morenci |  |  |
Mining Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 50.00% |  |
North America | Cost of Goods, Product Line | Supplier Concentration Risk | Atlantic Copper Smelting & Refining |  |  |
Mining Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 10.00% |  |
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 | 7.00% |  |
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% |  |
PT Smelting | Revenue from Contract with Customer Benchmark [Member] |  |  |
Mining Segment Reporting Information [Line Items] |  |  |
Concentration risk percentage | 12.00% | 13.00% | 12.00%
Morenci |  |  |
Mining Segment Reporting Information [Line Items] |  |  |
Ownership percentage | 72.00% |  |

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