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DEBT - Components of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 30, 2016 | Jun. 30, 2016 | May 30, 2016 | Nov. 30, 2014 | Mar. 31, 2013 | Feb. 28, 2012
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Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  | $ 2,228 |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities | $ 13,117 | 16,027 |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months | 1,414 | 1,232 |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations | 11,703 | 14,795 |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Long-term Debt | $ 1,200 |  |  |  |  |  |  |
Senior Notes [Member] | 2.15% Senior Notes due 2017 [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.15% |  |  |  |  |  |  | 2.15%
Long-term Debt | $ 0 | 500 |  |  |  |  |  |
Senior Notes [Member] | 2.30% Senior Notes Due 2017 |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.30% |  |  |  |  | 2.30% |  |
Long-term Debt | $ 0 | 728 |  |  |  |  |  |
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 | $ 1,408 | 1,480 |  |  |  |  |  |
Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.125% |  |  |  |  |  |  |
Long-term Debt | $ 0 | 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 | $ 997 | 996 |  |  |  |  |  |
Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |  |  |  |  |  |  |
Long-term Debt | $ 0 | 583 |  |  |  |  |  |
Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.625% |  |  |  |  |  |  |
Long-term Debt | $ 0 | 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 | $ 596 | 595 |  |  |  |  |  |
Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.75% |  |  |  |  |  |  |
Long-term Debt | $ 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 | $ 1,884 | 1,882 |  |  |  |  |  |
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 | $ 776 | 784 | $ 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 | $ 1,914 | 1,912 |  |  |  |  |  |
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 | 844 |  |  |  |  |  |
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 | $ 740 | 739 |  |  |  |  |  |
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 | $ 1,842 | 1,842 |  |  |  |  |  |
Other Debt, Including Capital Leases and Short Term Borrowings [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities | 7 | 5 |  |  |  |  |  |
Revolving Credit Facility [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Long-term Debt | 0 | 0 |  |  |  |  |  |
Cerro Verde | Shareholder Loan [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Long-term Debt | 0 | 261 |  |  |  |  |  |
Cerro Verde | Line of Credit [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Long-term Debt | $ 1,269 | 1,390 |  | $ 1,500 | $ 1,275 |  |  |
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% |  |  |  |  |  |  |
Long-term Debt | $ 0 | 60 |  |  |  |  |  |
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% |  |  |  |  |  |  |
Long-term Debt | $ 0 | 69 |  |  |  |  |  |
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% |  |  |  |  |  |  |
Long-term Debt | $ 0 | 35 |  |  |  |  |  |
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% |  |  |  |  |  |  |
Long-term Debt | $ 0 | 48 |  |  |  |  |  |
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 | $ 54 | 55 |  |  |  |  |  |
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 | $ 127 | 128 |  |  |  |  |  |
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 | $ 116 | 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 |  |  |  |  |  |

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