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DISPOSITIONS AND ACQUISITIONS (Oil and Gas Operations) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) $ / bbl | Dec. 31, 2019 USD ($) $ / bbl | Dec. 31, 2018 USD ($) $ / bbl | Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sales | $ 0 |  |  |
Net gain on sales of assets | 473 | $ 417 | $ 208 |
Other current assets | (341) | (655) |  |
Other assets | (1,560) | (1,885) |  |
Freeport-McMoRan Oil & Gas |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sales |  | 36 |  |
Net gain (loss) on sales of assets |  |  | 27 |
Freeport-McMoRan Oil & Gas | Onshore California |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Contingent receivable | 50 |  |  | $ 150
Contingent consideration asset, per year | $ 50 | 50 | $ 50 |
Other assets |  | $ (11) |  |
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 | Deepwater Gulf of Mexico Interests |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Contingent receivable |  |  |  | $ 150
Other current assets | $ (12) | $ (18) |  |
Other assets | (96) | (104) |  |
Corporate And Eliminations [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net gain on sales of assets | $ 473 | 417 | $ 208 |
Corporate And Eliminations [Member] | Gulf of Mexico Shelf and Madden properties [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net gain on sales of assets |  | $ 20 |  |

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