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DISPOSITIONS AND ACQUISITIONS (Oil and Gas Operations) (Details) $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2016 USD ($) | Dec. 15, 2016 USD ($) | Jul. 25, 2016 USD ($) | Jun. 17, 2016 USD ($) | Dec. 31, 2016 USD ($) $ / bbl | Dec. 31, 2016 USD ($) $ / bbl | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2016 USD ($) $ / bbl | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 20, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  | $ 1,956 | $ 1,956 |  |  |  | $ 1,956 | $ 1,987 |  |  |  |  |
Net gain on sales of assets |  |  |  |  |  |  |  |  |  | (649) | (39) | $ (717) |  |  |  |
Adjustment to goodwill |  |  |  |  |  |  |  |  |  |  |  | 221 |  |  |  |
Vito Basin [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | $ 496 |  |  |  |  |  |  |  |  |
Lucas Heidelberg |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  | $ 918 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 2,272 | 0 | 0 |  |  |  |
Eagle Ford shale assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  |  |  |  |  |  |  |  | 3,100 | 0 | $ 0 | $ 2,910 |  |  |  |
Changes in deferred tax liabilities and deferred tax asset valuation allowances |  |  |  |  |  |  |  | $ 84 |  |  |  |  |  |  |  |
Adjustment to goodwill |  |  |  |  |  |  |  |  | $ 221 |  |  |  |  |  |  |
Deposits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300
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 |  |  |  |  |  |
Preferred stock redemption amount |  |  |  |  | 582 | 582 |  |  |  | 582 |  |  |  |  |  |
Gain on redemption of preferred stock |  |  |  |  | 199 | 199 |  |  |  | 199 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  | $ 33 | $ 33 |  |  |  | $ 33 |  |  |  |  |  |
Proceeds from sales | 592 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 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 | $ 50 | $ 50 |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales |  | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |

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