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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 21, 2018
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Operating Lease, Right-of-Use Asset | $ 207 | $ 232 |  |
Total cost of sales | 11,655 | 13,125 | $ 13,466 |
Selling, general and administrative expenses | 370 | 394 | 422 |
Exploration Expense | 50 | 104 | 105 |
Environmental obligations and shutdown costs | 159 | 105 | 89 |
Costs and Expenses | 11,761 | 13,311 | 13,874 |
Operating income (loss) | 2,437 | 1,091 | 4,754 |
Accrued income taxes and timing of other tax payments | 403 | (29) | (634) |
Net cash provided by (used in) operating activities | 3,017 | 1,482 | 3,863 |
Foreign currency transaction gains (losses), before tax | 34 | 24 | 14 |
Payments for (Proceeds from) Other Investing Activities | (7) | (12) | (97) |
Net cash provided by (used in) investing activities | (1,264) | (2,103) | (5,018) |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | 1,625 | (2,177) | (255) |
Other income (expense), net | $ 59 | (138) | 76 |
PT Freeport Indonesia [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Ownership percentage of subsidiary |  |  |  | 48.76%
Production and Delivery Costs [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Prior Period Reclassification Adjustment |  | $ 20 | $ 21 |
Copper |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of ultimate copper recovery from leach stockpiles | 90.00% |  |  |
Percentage of copper ultimately recoverable from newly placed material on active stockpiles extracted during the first year | 80.00% |  |  |
PT Freeport Indonesia [Member] | PT Freeport Indonesia [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Ownership percentage of subsidiary | 48.76% |  |  |

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- Definition The percentage of recoverable copper material in active copper leach stockpiles. Ultimate recoveries can vary (exceeding the stated percentage) based on the type of copper recovery, mineralogy and particle size of the rock. + References No definition available. + Details
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- Definition Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 + Details
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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109237650&loc=d3e13064-110858 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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- Definition Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 + Details
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