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DEBT - Components of Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Mar. 31, 2014 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | May 30, 2016 | Nov. 30, 2014 | Mar. 31, 2013 | Feb. 28, 2012
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  | $ 2,228 |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  | $ 11,141 | $ 13,229 |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months |  |  | 17 | 1,414 |  |  |  |  |  |
Long-term debt, less current portion |  |  | 11,124 | 11,815 |  |  |  |  |  |
Term of Debt Agreement | 5 years |  |  |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | $ 800 |  |  |  |  |  |  |
Senior Notes [Member] | 2.15% Senior Notes due 2017 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.15% |  |  |  |  |  |  | 2.15%
Senior Notes [Member] | 2.30% Senior Notes Due 2017 |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.30% |  |  |  |  | 2.30% |  |
Senior Notes [Member] | 2.375% Senior Notes due March 2018 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.375% |  |  |  |  |  | 2.375% |
Long-term Debt |  |  | $ 0 | $ 1,408 |  |  |  |  |  |
Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.125% | 6.125% |  |  |  |  |  |
Long-term Debt |  |  |  |  | 186 |  |  |  |  |
Senior Notes [Member] | 3.100% Senior Notes due March 2020 |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.10% |  |  |  |  |  | 3.10% |
Long-term Debt |  |  | $ 999 | $ 997 |  |  |  |  |  |
Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.50% | 6.50% |  |  |  |  |  |
Long-term Debt |  |  |  |  | 583 |  |  |  |  |
Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.625% | 6.625% |  |  |  |  |  |
Long-term Debt |  |  |  |  | 242 |  |  |  |  |
Senior Notes [Member] | 4.00% Senior Notes Due 2021 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.00% |  |  |  |  | 4.00% |  |
Long-term Debt |  |  | $ 597 | $ 596 |  |  |  |  |  |
Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.75% | 6.75% |  |  |  |  |  |
Long-term Debt |  |  | $ 0 | $ 427 | 432 |  |  |  |  |
Senior Notes [Member] | 3.55% Senior Notes Due 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.55% |  |  |  |  |  |  | 3.55%
Long-term Debt |  |  | $ 1,886 | $ 1,884 |  |  |  |  |  |
Senior Notes [Member] | 6.875% Senior Notes due 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.875% | 6.875% |  |  |  |  |  |
Long-term Debt |  |  | $ 768 | $ 776 | $ 785 |  |  |  |  |
Senior Notes [Member] | 3.875% Senior Notes due March 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.875% |  |  |  |  |  | 3.875% |
Long-term Debt |  |  | $ 1,915 | 1,914 |  |  |  |  |  |
Senior Notes [Member] | senior notes 4.55 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.55% |  |  |  |  | 4.55% |  |
Long-term Debt |  |  | $ 845 | 845 |  |  |  |  |  |
Senior Notes [Member] | Senior Notes due 2034 5 point 4 percent [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.40% |  |  |  |  | 5.40% |  |
Long-term Debt |  |  | $ 741 | 740 |  |  |  |  |  |
Senior Notes [Member] | 5.450% Senior Notes due March 2043 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.45% |  |  |  |  |  | 5.45% |
Long-term Debt |  |  | $ 1,843 | 1,842 |  |  |  |  |  |
Other Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  | 166 | 119 |  |  |  |  |  |
Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  | 0 | 0 |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  | 3,500 |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 3,500 |  |  |  |  |  |  |  |  |
Amount of revolving credit facility available to PT Freeport Indonesia | 500 |  |  |  |  |  |  |  |  |
Letter of Credit [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  | 13 |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 1,500 |  | 1,500 |  |  |  |  |  |  |
Cerro Verde | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities |  |  |  | 1,269 |  |  |  |  |  |
Cerro Verde | Line of Credit [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment |  |  | 20 |  |  |  |  |  |  |
Long-term Debt |  |  | $ 1,023 |  |  | $ 1,500 | $ 1,275 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 1,800 |  |  |  |  |  |  |  |
Term of Debt Agreement |  | 5 years |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.875% Senior Notes due 2023 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.875% |  |  |  |  |  |  |
Long-term Debt |  |  | $ 0 | 54 |  |  |  |  |  |
Freeport McMoRan Corporation [Member] | Senior Notes [Member] | Senior Notes Due 2031 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 9.50% |  |  |  |  |  |  |
Long-term Debt |  |  | $ 126 | 127 |  |  |  |  |  |
Freeport McMoRan Corporation [Member] | Senior Notes [Member] | Senior Notes Due 2034 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.125% |  |  |  |  |  |  |
Long-term Debt |  |  | $ 117 | 116 |  |  |  |  |  |
Freeport McMoRan Corporation [Member] | Debentures [Member] | Debentures Due 2027 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.125% |  |  |  |  |  |  |
Long-term Debt |  |  | $ 115 | 115 |  |  |  |  |  |
Debt Instrument, Payment Period One [Member] | Cerro Verde | Line of Credit [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment |  |  | 225 |  |  |  |  |  |  |
Repayments of Lines of Credit |  |  | 5 | $ 220 |  |  |  |  |  |
Debt Instrument, Payment Period Three [Member] | Cerro Verde | Line of Credit [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment |  |  | $ 525 |  |  |  |  |  |  |

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