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BUSINESS SEGMENTS INFORMATION (Product Revenue) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Product revenue [Line Items] |  |  |
Revenues | $ 14,198 | $ 14,402 | $ 18,628
Treatment and refining charges included in copper concentrates revenues | (362) | (404) | (535)
Royalty Expense | (165) | (113) | (246)
Revenue from Contract with Customer, Excluding Assessed Tax | 13,894 | 14,348 | 18,945
Copper in concentrate |  |  |
Product revenue [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 4,294 | 4,566 | 6,180
Rod and other refined copper products |  |  |
Product revenue [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 2,052 | 2,110 | 2,396
Purchased Copper [Member] |  |  |
Product revenue [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 821 | 1,060 | 1,053
Copper Cathode |  |  |
Product revenue [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 4,204 | 3,656 | 4,366
Gold |  |  |
Product revenue [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,702 | 1,620 | 3,231
Molybdenum |  |  |
Product revenue [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 848 | 1,169 | 1,190
Other |  |  |
Product revenue [Line Items] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 592 | 905 | 1,490
Derivatives Not Designated as Hedging Instruments | Sales [Member] |  |  |
Product revenue [Line Items] |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | 304 | 54 | (317)
PT Freeport Indonesia [Member] |  |  |
Product revenue [Line Items] |  |  |
Royalty Expense | $ (160) | (106) | $ (238)
Indonesia Tax Authority | PT Freeport Indonesia [Member] | Memorandum of Understanding with the Indonesian Government, Indonesia Supreme Court Appeal [Member] |  |  |
Product revenue [Line Items] |  |  |
Export Duties Expense |  | $ (155) |

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