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DEBT - Debt Extinguishment (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2014 | Mar. 31, 2013 | Feb. 28, 2012
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 2,342,000,000 |  |  |
Debt Issuance Costs, Net | $ (69,000,000) | $ (85,000,000) |  |  |  |
Liabilities, Fair Value Adjustment | 58,000,000 | 97,000,000 |  |  |  |
Gain (Loss) on Extinguishment of Debt | 7,000,000 | 21,000,000 | 26,000,000 |  |  |
Senior Notes [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount | 454,000,000 | 1,234,000,000 | 407,000,000 |  | $ 6,500,000,000 |
Debt Issuance Costs, Net | (26,000,000) |  | (4,000,000) |  |  |
Liabilities, Fair Value Adjustment |  | 49,000,000 | 151,000,000 |  |  |
Extinguishment of Debt, Amount | 480,000,000 | 1,283,000,000 | 403,000,000 |  |  |
Extinguishment Of Debt, Redemption Value | 470,000,000 | 1,257,000,000 | 349,000,000 |  |  |
Gain (Loss) on Extinguishment of Debt | 10,000,000 | 26,000,000 | 54,000,000 |  |  |
Gains (losses) primarily associated with modification of credit facility | 3,000,000 | (5,000,000) |  |  |  |
Losses related to deferred debt issuance costs and senior note exchange offer |  |  | 28,000,000 |  |  |
Senior Notes [Member] | 2.30% Senior Notes Due 2017 |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | 20,000,000 | $ 750,000,000 |  |
Debt Issuance Costs, Net |  |  | 0 |  |  |
Extinguishment of Debt, Amount |  |  | 20,000,000 |  |  |
Extinguishment Of Debt, Redemption Value |  |  | 20,000,000 |  |  |
Gain (Loss) on Extinguishment of Debt |  |  | 0 |  |  |
Senior Notes [Member] | 2.375% Senior Notes due March 2018 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 74,000,000 | 18,000,000 |  | 1,500,000,000 |
Debt Issuance Costs, Net |  |  | 0 |  |  |
Liabilities, Fair Value Adjustment |  | 0 |  |  |  |
Extinguishment of Debt, Amount |  | 74,000,000 | 18,000,000 |  |  |
Extinguishment Of Debt, Redemption Value |  | 74,000,000 | 18,000,000 |  |  |
Gain (Loss) on Extinguishment of Debt |  | 0 | 0 |  |  |
Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 179,000,000 | 237,000,000 |  |  |
Liabilities, Fair Value Adjustment |  | 5,000,000 |  |  |  |
Extinguishment of Debt, Amount |  | 184,000,000 |  |  |  |
Extinguishment Of Debt, Redemption Value |  | 182,000,000 |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | 2,000,000 |  |  |  |
Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 552,000,000 | 617,000,000 |  |  |
Liabilities, Fair Value Adjustment |  | 23,000,000 |  |  |  |
Extinguishment of Debt, Amount |  | 575,000,000 |  |  |  |
Extinguishment Of Debt, Redemption Value |  | 562,000,000 |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | 13,000,000 |  |  |  |
Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 228,000,000 | 261,000,000 |  |  |
Liabilities, Fair Value Adjustment |  | 12,000,000 |  |  |  |
Extinguishment of Debt, Amount |  | 240,000,000 |  |  |  |
Extinguishment Of Debt, Redemption Value |  | 234,000,000 |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | 6,000,000 |  |  |  |
Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount | 404,000,000 |  | 449,000,000 |  |  |
Debt Issuance Costs, Net | (22,000,000) |  |  |  |  |
Extinguishment of Debt, Amount | 426,000,000 |  |  |  |  |
Extinguishment Of Debt, Redemption Value | 418,000,000 |  |  |  |  |
Gain (Loss) on Extinguishment of Debt | 8,000,000 |  |  |  |  |
Senior Notes [Member] | 3.55% Senior Notes Due 2022 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | 108,000,000 |  |  | $ 2,000,000,000
Debt Issuance Costs, Net |  |  | (1,000,000) |  |  |
Extinguishment of Debt, Amount |  |  | 107,000,000 |  |  |
Extinguishment Of Debt, Redemption Value |  |  | 96,000,000 |  |  |
Gain (Loss) on Extinguishment of Debt |  |  | 11,000,000 |  |  |
Senior Notes [Member] | 3.875% Senior Notes due March 2023 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | 77,000,000 |  | 2,000,000,000 |
Debt Issuance Costs, Net |  |  | 0 |  |  |
Extinguishment of Debt, Amount |  |  | 77,000,000 |  |  |
Extinguishment Of Debt, Redemption Value |  |  | 68,000,000 |  |  |
Gain (Loss) on Extinguishment of Debt |  |  | 9,000,000 |  |  |
Senior Notes [Member] | Senior Notes due 2034 5 point 4 percent [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | 50,000,000 | $ 800,000,000 |  |
Debt Issuance Costs, Net |  |  | (1,000,000) |  |  |
Extinguishment of Debt, Amount |  |  | 49,000,000 |  |  |
Extinguishment Of Debt, Redemption Value |  |  | 41,000,000 |  |  |
Gain (Loss) on Extinguishment of Debt |  |  | 8,000,000 |  |  |
Senior Notes [Member] | 5.450% Senior Notes due March 2043 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | 134,000,000 |  | $ 2,000,000,000 |
Debt Issuance Costs, Net |  |  | (2,000,000) |  |  |
Extinguishment of Debt, Amount |  |  | 132,000,000 |  |  |
Extinguishment Of Debt, Redemption Value |  |  | 106,000,000 |  |  |
Gain (Loss) on Extinguishment of Debt |  |  | 26,000,000 |  |  |
Senior Notes [Member] | 6.875% Senior Notes due 2023 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 778,000,000 |  |  |
Freeport-McMoRan Oil & Gas LLC [Member] | Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 58,000,000 |  |  |  |
Liabilities, Fair Value Adjustment |  | 2,000,000 |  |  |  |
Extinguishment of Debt, Amount |  | 60,000,000 |  |  |  |
Extinguishment Of Debt, Redemption Value |  | 59,000,000 |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | 1,000,000 |  |  |  |
Freeport-McMoRan Oil & Gas LLC [Member] | Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 65,000,000 |  |  |  |
Liabilities, Fair Value Adjustment |  | 3,000,000 |  |  |  |
Extinguishment of Debt, Amount |  | 68,000,000 |  |  |  |
Extinguishment Of Debt, Redemption Value |  | 66,000,000 |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | 2,000,000 |  |  |  |
Freeport-McMoRan Oil & Gas LLC [Member] | Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 33,000,000 |  |  |  |
Liabilities, Fair Value Adjustment |  | 2,000,000 |  |  |  |
Extinguishment of Debt, Amount |  | 35,000,000 |  |  |  |
Extinguishment Of Debt, Redemption Value |  | 34,000,000 |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | 1,000,000 |  |  |  |
Freeport-McMoRan Oil & Gas LLC [Member] | Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | 45,000,000 |  |  |  |
Liabilities, Fair Value Adjustment |  | 2,000,000 |  |  |  |
Extinguishment of Debt, Amount |  | 47,000,000 |  |  |  |
Extinguishment Of Debt, Redemption Value |  | 46,000,000 |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ 1,000,000 |  |  |  |
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.875% Senior Notes due 2023 [Member] |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount | 50,000,000 |  |  |  |  |
Debt Issuance Costs, Net | (4,000,000) |  |  |  |  |
Extinguishment of Debt, Amount | 54,000,000 |  |  |  |  |
Extinguishment Of Debt, Redemption Value | 52,000,000 |  |  |  |  |
Gain (Loss) on Extinguishment of Debt | $ 2,000,000 |  |  |  |  |

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