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DISPOSITIONS AND ACQUISITIONS (Oil and Gas Operations) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) $ / bbl | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) $ / bbl | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain on sales of assets |  |  |  | $ 82 | $ 70 | $ 45 | $ 11 | $ 15 | $ 33 | $ 10 | $ 23 | $ 208 | $ 81 | $ 649 |  |
Net gain (loss) on sales of assets |  |  |  |  |  |  |  |  |  |  |  | 208 | 81 | 649 |  |
Other current assets |  |  |  | (422) |  |  |  | (286) |  |  |  | (422) | (286) |  |  |
Other assets |  |  |  | (2,172) |  |  |  | (2,273) |  |  |  | (2,172) | (2,273) |  |  |
Deepwater Gulf of Mexico and onshore California oil and gas properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 2,272 |  |
Freeport-McMoRan Oil & Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  |  |  |  |  |  |  |  |  |  |  |  | 80 |  |  |
Net gain (loss) on sales of assets |  |  |  |  |  |  |  |  |  |  |  | 27 |  |  |  |
Freeport-McMoRan Oil & Gas | Deepwater Gulf of Mexico and onshore California oil and gas properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sales of assets |  |  |  |  |  |  |  |  |  |  |  |  |  | (9) |  |
Preferred stock redemption amount | $ 582 |  |  |  |  |  |  |  |  |  |  |  |  | 582 |  |
Gain on redemption of preferred stock | 199 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Freeport-McMoRan Oil & Gas | Onshore California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales | 592 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent receivable | 33 |  |  | 150 |  |  |  |  |  |  |  | 150 |  | 33 |  |
Contingent consideration asset, per year |  |  |  |  |  |  |  |  |  |  |  | 50 |  |  |  |
Other assets |  |  |  | $ (16) |  |  |  | (34) |  |  |  | $ (16) | (34) |  |  |
Freeport-McMoRan Oil & Gas | Onshore California | Crude Oil |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration, reference threshold, price per barrel (in us dollars per pound) | $ / bbl |  |  |  | 70 |  |  |  |  |  |  |  | 70 |  |  |  |
Freeport-McMoRan Oil & Gas | Deepwater Gulf of Mexico Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales | 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent receivable | $ 150 |  |  |  |  |  |  |  |  |  |  |  |  | $ 150 |  |
Contingent payments, collections |  |  |  |  |  |  |  |  |  |  |  | $ 7 |  |  |  |
Other current assets |  |  |  | $ (27) |  |  |  | (24) |  |  |  | (27) | (24) |  |  |
Other assets |  |  |  | $ (116) |  |  |  | $ (126) |  |  |  | $ (116) | $ (126) |  |  |
Freeport-McMoRan Oil & Gas | Haynesville |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  | $ 87 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Freeport-McMoRan Oil & Gas | Black Stone Minerals, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  |  | $ 102 |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast [Member] | Freeport-McMoRan Oil & Gas | Onshore California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50 | $ 50

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