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DEBT - Schedule of Senior Notes (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Aug. 15, 2019
Debt Instruments [Line Items] |  |  |  |
Gain (Loss) on Extinguishment of Debt | $ (27) | $ 7 | $ 21 |
Liabilities, Fair Value Adjustment | 11 | 58 |  |
Long-term Debt | 9,826 | 11,141 |  |
Debt Issuance Costs, Net | $ 66 | 69 |  |
Senior Notes due 2027, 5% [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% |  |  | 5.00%
Long-term Debt |  |  |  | $ 600
Senior Notes Due 2023 [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 6.875%
Senior Notes due 2029, 5.25% [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |  |  | 5.25%
Long-term Debt |  |  |  | $ 600
Senior Notes [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Extinguishment Of Debt, Redemption Value | $ 2,201 | 470 | 1,257 |
Gain (Loss) on Extinguishment of Debt | 26 | (10) | (26) |
Debt Instrument, Face Amount | 2,145 | 454 | 1,234 |
Extinguishment of Debt, Amount | 2,175 | 480 | 1,283 |
Senior Notes [Member] | Senior Notes due 2027, 5% [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Long-term Debt | 592 | 0 |  |
Senior Notes [Member] | 3.100% Senior Notes due March 2020 |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Extinguishment Of Debt, Redemption Value | 1,003 |  |  |
Gain (Loss) on Extinguishment of Debt | $ 5 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.10% |  |  |
Debt Instrument, Face Amount | $ 1,000 |  |  |
Long-term Debt | 0 | $ 999 |  |
Extinguishment of Debt, Amount | 998 |  |  |
Senior Notes [Member] | Senior Notes Due 2023 [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Extinguishment Of Debt, Redemption Value | 768 |  |  |
Gain (Loss) on Extinguishment of Debt | 6 |  |  |
Debt Instrument, Face Amount | 728 |  |  |
Extinguishment of Debt, Amount | $ 762 |  |  |
Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Extinguishment Of Debt, Redemption Value |  |  | 182 |
Gain (Loss) on Extinguishment of Debt |  |  | (2) |
Debt Instrument, Interest Rate, Stated Percentage | 6.125% | 6.125% |  |
Debt Instrument, Face Amount |  |  | 179 |
Extinguishment of Debt, Amount |  |  | 184 |
Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Extinguishment Of Debt, Redemption Value |  |  | 562 |
Gain (Loss) on Extinguishment of Debt |  |  | (13) |
Debt Instrument, Interest Rate, Stated Percentage | 6.50% | 6.50% |  |
Debt Instrument, Face Amount |  |  | 552 |
Extinguishment of Debt, Amount |  |  | 575 |
Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Extinguishment Of Debt, Redemption Value |  |  | 234 |
Gain (Loss) on Extinguishment of Debt |  |  | (6) |
Debt Instrument, Interest Rate, Stated Percentage | 6.625% | 6.625% |  |
Debt Instrument, Face Amount |  |  | 228 |
Extinguishment of Debt, Amount |  |  | $ 240 |
Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.75% | 6.75% |  |
Senior Notes [Member] | 3.55% Senior Notes Due 2022 [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Extinguishment Of Debt, Redemption Value | $ 12 |  |  |
Gain (Loss) on Extinguishment of Debt | $ 0 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.55% |  |  |
Debt Instrument, Face Amount | $ 12 |  |  |
Long-term Debt | 1,876 | $ 1,886 |  |
Extinguishment of Debt, Amount | 12 |  |  |
Senior Notes [Member] | Senior Notes due 2029, 5.25% [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Long-term Debt | $ 592 | $ 0 |  |
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.125% |  |  |
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |  |  |
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.625% |  |  |
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member] |  |  |  |
Debt Instruments [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.75% |  |  |

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