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DEBT - Schedule of Senior Notes (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2013 | May 31, 2013 | Mar. 30, 2013 | Feb. 29, 2012 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 30, 2016 | Mar. 31, 2013
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment |  |  |  |  | $ 97 | $ 179 |  |
Debt Instrument, Face Amount |  |  |  |  |  | 2,342 |  |
Principal Amount of Senior Notes Tendered |  |  |  |  |  | 2,091 |  |
Long-term Debt |  |  |  |  |  | $ 2,228 |  |
Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Percentage of FM O&G LLC senior notes tendered for new FCX senior notes |  |  |  |  |  | 89.00% |  |
Debt Instrument, Unamortized Consideration Paid |  |  |  |  | 9 |  |  |
Liabilities, Fair Value Adjustment |  |  |  |  | 49 | $ 151 |  |
Debt Instrument, Unamortized Fair Value Adjustments |  |  |  |  | 81 |  |  |
Debt Instrument, Face Amount |  |  |  |  | 1,234 | 407 |  | $ 6,500
Proceeds from Issuance of Long-term Debt | $ 2,970 |  | $ 6,400 | $ 2,470 |  |  |  |
Long-term Debt |  |  |  |  | 1,200 |  |  |
Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment |  |  |  |  | $ 5 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.125% |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 179 | 237 |  |
Principal Amount of Senior Notes Tendered |  |  |  |  |  | 179 |  |
Long-term Debt |  |  |  |  | 0 | 186 |  |
Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment |  |  |  |  | $ 23 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.50% |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 552 | 617 |  |
Principal Amount of Senior Notes Tendered |  |  |  |  |  | 552 |  |
Long-term Debt |  |  |  |  | 0 | 583 |  |
Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment |  |  |  |  | $ 12 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.625% |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 228 | 261 |  |
Principal Amount of Senior Notes Tendered |  |  |  |  |  | 228 |  |
Long-term Debt |  |  |  |  | $ 0 | 242 |  |
Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.75% |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | 449 |  |
Principal Amount of Senior Notes Tendered |  |  |  |  |  | 404 |  |
Long-term Debt |  |  |  |  | $ 427 | 432 |  |
Senior Notes [Member] | 6.875% Senior Notes due 2023 [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.875% |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | 778 |  |
Principal Amount of Senior Notes Tendered |  |  |  |  |  | 728 |  |
Long-term Debt |  |  |  |  | $ 776 | 784 | $ 785 |
Freeport-McMoRan Oil & Gas | Senior Notes [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment |  | $ 716 |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 6,400 |  |  |  |  |  |
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] |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment |  |  |  |  | $ 2 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.625% |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 33 |  |  |
Long-term Debt |  |  |  |  | 0 | 35 |  |
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Liabilities, Fair Value Adjustment |  |  |  |  | $ 2 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.75% |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 45 |  |  |
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 |  |

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