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CONTINGENCIES (Tax and Other Matters) (Details) $ in Millions, Rp in Billions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 21 Months Ended | 36 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 07, 2021 USD ($) | Feb. 28, 2021 USD ($) | Feb. 28, 2021 IDR (Rp) | Oct. 31, 2019 USD ($) | Oct. 31, 2019 IDR (Rp) | May 31, 2019 USD ($) | May 31, 2019 IDR (Rp) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 IDR (Rp) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 21, 2018 USD ($) | Dec. 31, 2019 USD ($)
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  | $ 944 | $ 510 | $ 991 |  |  |
Net income (Net income from continuing operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 266 | 50 | 292 |  |  |
Long-term receivable for taxes |  |  |  |  |  |  |  |  |  | $ 106 | 106 | 290 |  |  |  | $ 290
Other assets |  |  |  |  |  |  |  |  |  | 1,560 | $ 1,560 | 1,885 |  |  |  | 1,885
Smelter development export duty, threshold |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Production and delivery |  |  |  |  |  |  |  |  |  |  | $ 10,031 | 11,534 | 11,708 |  |  |
Export Duties Expense |  |  |  |  |  |  |  |  |  |  | 92 | 221 | 180 |  |  |
Cerro Verde Royalty Dispute | Cerro Verde | Royalty Assessments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  |  | (2) | (35) | $ 7 |  | (30)
Net income (Net income from continuing operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  | (7) | (176) | (169) |  | (352)
Production and delivery |  |  |  |  |  |  |  |  |  |  |  | 6 | 14 | 203 |  | 223
Loss contingency, loss In period, attributable to parent |  |  |  |  |  |  |  |  |  |  |  | 7 | 195 | $ 186 |  | 388
Surface Water Taxes, Papua, Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  |  | $ 28 |  | $ 69 |  |  |  |  |  |  |  |
Judicial Ruling | Cerro Verde Royalty Dispute | Tax Year 2006 To Tax Year 2008 | Royalty Assessments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for legal settlements |  |  |  |  |  |  |  |  |  |  | $ 477 |  |  |  |  |
Judicial Ruling | Cerro Verde Royalty Dispute | December 2006 to Tax Year 2013 | Unfavorable Regulatory Actions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  |  |  | (35) |  |  |
PT-FI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, loss in period, including tax charges |  |  |  |  |  |  |  |  |  | (42) |  | (304) |  |  |  |
Progressive export duty on copper concentrates, lower threshold, percent |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |
Progressive export duty on copper concentrates, higher threshold, percent |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  | 7.50% |
Export Duties Expense |  |  |  |  |  |  |  |  |  |  | $ 92 | 66 | 180 |  |  |
PT-FI | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Administrative Fees Expense | $ 149 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cerro Verde |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  |  |  |  | 44 | 58 |  |  |  |
SUNAT | Cerro Verde |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivable for taxes |  |  |  |  |  |  |  |  |  | 433 | 433 |  |  |  |  |
Increase (decrease) in income taxes receivable |  |  |  |  |  |  |  |  |  | 243 | 243 |  |  |  |  |
Tax Authority, In Papau, Indonesia | PT-FI | Surface Water Taxes, Papua, Indonesia [Member] | Penalties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for legal settlements |  |  |  | $ 50 | Rp 708.5 |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  |  |  |  | $ 99 | Rp 1,394.0 |  | Rp 1,000,000,000,000,000.0 |  |  |  |  |  |  |
Indonesian Supreme Court | PT-FI | The year 2005 and the year 2007 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, loss in period |  |  |  |  |  |  |  |  |  |  |  | (47) | $ (61) |  |  |
Cerro Verde |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivable for taxes |  |  |  |  |  |  |  |  |  | 190 | 190 | 187 |  |  |  | 187
PT-FI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term receivable for taxes |  |  |  |  |  |  |  |  |  | $ 143 | 143 | 178 |  |  |  | $ 178
Annual Surface Water Tax Payments [Member] | PT-FI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquire water systems |  |  |  |  |  |  |  |  |  |  | $ 15 |  |  |  |  |
Forecast [Member] | Tax Authority, In Papau, Indonesia | PT-FI | Surface Water Taxes, Papua, Indonesia [Member] | Penalties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for legal settlements |  | $ 49 | Rp 685.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Indonesia Tax Authority | PT-FI | Memorandum of Understanding with the Indonesian Government [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Progressive export duty on copper concentrates, lower threshold, percent |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |
Progressive export duty on copper concentrates, higher threshold, percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50% |
Export Duties Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 155 |
Litigation Settlement, Amount Awarded from Other Party |  |  |  |  |  |  |  |  |  |  |  | 29 |  |  |  |
Indonesia Tax Authority | PT-FI | Memorandum of Understanding with the Indonesian Government, Indonesia Supreme Court Appeal [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, loss in period |  |  |  |  |  |  |  |  |  |  |  | $ (155) |  |  |  |
Progressive export duty on copper concentrates, lower threshold, percent |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |

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