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DISPOSITIONS AND ACQUISITIONS (Oil and Gas Operations) (Details) $ in Millions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) | Mar. 17, 2017 USD ($) | Dec. 30, 2016 USD ($) | Dec. 15, 2016 USD ($) | Jul. 25, 2016 USD ($) | Jun. 17, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) $ / bbl | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current assets |  |  |  |  |  |  | $ 199.0 | $ 199.0 | $ 270.0 | $ 199.0 |  |  |  |
Other assets |  |  |  |  |  |  | 1,956.0 | 1,956.0 | 2,270.0 | 1,956.0 |  |  |  |
Net gain on sales of assets |  |  |  |  |  |  |  |  | (81.0) | (649.0) | $ (39.0) |  |  |
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 | 2,272.0 | $ 0.0 |  |  |
Freeport-McMoRan Oil & Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain on sales of assets |  |  |  |  |  |  |  |  | (49.0) |  |  |  |  |
Freeport-McMoRan Oil & Gas | Gulf of Mexico [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales | $ 62.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Freeport-McMoRan Oil & Gas | Madden [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  | $ 17.5 |  |  |  |  |  |  |  |  |  |  |  |
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 on sales of assets |  |  |  |  |  |  |  |  |  | 9.0 |  |  |  |
Preferred stock redemption amount |  |  |  |  |  |  | 582.0 | 582.0 |  | 582.0 |  |  |  |
Gain on redemption of preferred stock |  |  |  |  |  |  | 199.0 | 199.0 |  |  |  |  |  |
Freeport-McMoRan Oil & Gas | Onshore California |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration asset |  |  | $ 150.0 |  |  |  | 33.0 | 33.0 |  | 33.0 |  |  |  |
Other assets |  |  |  |  |  |  | 33.0 | 33.0 | $ 34.0 | 33.0 |  |  |  |
Proceeds from sales |  |  | 592.0 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |
Freeport-McMoRan Oil & Gas | Onshore California | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration asset |  |  |  |  |  |  |  |  |  |  |  | $ 50.0 | $ 50.0 | $ 50.0
Freeport-McMoRan Oil & Gas | Deepwater Gulf of Mexico Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration asset |  |  | $ 150.0 |  |  |  | $ 150.0 | $ 150.0 |  | $ 150.0 |  |  |  |
Other current assets |  |  |  |  |  |  |  |  | $ 24.0 |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  | $ 126.0 |  |  |  |  |
Proceeds from sales |  |  |  | $ 2,000.0 |  |  |  |  |  |  |  |  |  |
Freeport-McMoRan Oil & Gas | Haynesville |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  |  |  |  | $ 87.0 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | $ 102.0 |  |  |  |  |  |  |  |

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