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INCOME TAXES (Details) (USD $) | 3 Months Ended | 7 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 McMoRan Exploration Co [Member] | Jul. 31, 2012 Cerro Verde [Member] | Sep. 30, 2012 Cerro Verde [Member] | Dec. 31, 2013 Cerro Verde [Member] | Dec. 31, 2012 Cerro Verde [Member]
Income before income taxes and equity in affiliated companies' net earnings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  |  |  | $ 1,104,000,000 |  | $ 1,539,000,000 |  | $ 2,112,000,000 |  |  |  |  |  |  |  |
Foreign |  |  |  | 3,809,000,000 |  | 3,948,000,000 |  | 6,706,000,000 |  |  |  |  |  |  |  |
Total |  |  |  | 4,913,000,000 |  | 5,487,000,000 |  | 8,818,000,000 |  |  |  |  |  |  |  |
Current income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  | 203,000,000 |  | 238,000,000 |  | 394,000,000 |  |  |  |  |  |  |  |
State |  |  |  | 9,000,000 |  | 7,000,000 |  | 21,000,000 |  |  |  |  |  |  |  |
Foreign |  |  |  | 1,081,000,000 |  | 1,002,000,000 |  | 1,934,000,000 |  |  |  |  |  |  |  |
Total current |  |  |  | 1,293,000,000 |  | 1,247,000,000 |  | 2,349,000,000 |  |  |  |  |  |  |  |
Deferred income taxes (benefits): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  | 234,000,000 |  | 87,000,000 |  | 82,000,000 |  |  |  |  |  |  |  |
State |  |  |  | (35,000,000) |  | 18,000,000 |  | (19,000,000) |  |  |  |  |  |  |  |
Foreign |  |  |  | 346,000,000 |  | 363,000,000 |  | 622,000,000 |  |  |  |  |  |  |  |
Total deferred |  |  |  | 545,000,000 |  | 468,000,000 |  | 685,000,000 |  |  |  |  |  |  |  |
Adjustments |  |  |  | (199,000,000) | [1] | (205,000,000) | [2],[3] | 53,000,000 | [4] |  |  | 208,000,000 | [2],[3] |  | 205,000,000 | [2],[3]
Federal operating loss carryforwards |  |  |  | (164,000,000) | [5] | 0 |  | 0 |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  | 1,475,000,000 |  | 1,510,000,000 |  | 3,087,000,000 |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances | 16,000,000 | 183,000,000 |  | 199,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Deferred Other Tax Expense (Benefit) |  |  |  | 16,000,000 |  |  |  |  |  | 69,000,000 |  |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability, Environmental Matters |  |  |  | (76,000,000) |  |  |  |  |  |  |  |  |  |  |  |
Term of Stability Agreement |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |
Foreign Income Tax Rate Under Old Stability Agreement |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |
Foreign Income Tax Rate Under New Stability Agreegment |  |  |  |  |  |  |  |  |  |  | 32.00% |  |  |  |  |
Deferred Foreign Income Tax Expense from New Stability Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,000,000 |  |
Deferred Foreign Income Tax Expense (Benefit) Associated with Foreign Reinvested Profits |  |  |  |  |  |  |  |  |  |  |  |  |  | 234,000,000 |  |
Additional Tax Expense From New Legislation On Mining Royalties |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,000,000 |
Income tax expense (benefit), reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory tax rate |  |  |  | 1,720,000,000 |  | 1,920,000,000 |  | 3,086,000,000 |  |  |  |  |  |  |  |
Foreign tax credit limitation |  |  |  | 117,000,000 |  | 110,000,000 |  | 163,000,000 |  |  |  |  |  |  |  |
Percentage depletion |  |  |  | (223,000,000) |  | (263,000,000) |  | (283,000,000) |  |  |  |  |  |  |  |
Withholding and other impacts on foreign earnings |  |  |  | 83,000,000 |  | (221,000,000) | [6] | 170,000,000 |  |  |  |  |  |  |  |
Valuation allowance on minimum tax credits |  |  |  | 190,000,000 | [7] | 9,000,000 |  | 47,000,000 |  |  |  |  |  |  |  |
State income taxes |  |  |  | (43,000,000) |  | 17,000,000 |  | 0 |  |  |  |  |  |  |  |
Other items, net |  |  |  | 11,000,000 | [7] | (44,000,000) |  | (2,000,000) |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  | 1,475,000,000 |  | 1,510,000,000 |  | 3,087,000,000 |  |  |  |  |  |  |  |
Effective income tax rate, reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory tax rate |  |  | 35.00% | 35.00% |  | 35.00% |  | 35.00% |  |  |  |  |  |  |  |
Foreign tax credit limitation |  |  |  | 2.00% |  | 2.00% |  | 2.00% |  |  |  |  |  |  |  |
Percentage depletion |  |  |  | (5.00%) |  | (5.00%) |  | (3.00%) |  |  |  |  |  |  |  |
Withholding taxes |  |  |  | 2.00% |  | (4.00%) |  | 2.00% |  |  |  |  |  |  |  |
Valuation allowance on minimum tax credits |  |  |  | (4.00%) |  | 0.00% |  | (1.00%) |  |  |  |  |  |  |  |
State income taxes |  |  | 3.00% | 0.00% |  | 0.00% |  | 0.00% |  |  |  |  |  |  |  |
Other items, net |  |  |  | 0.00% |  | 0.00% |  | 0.00% |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  | 30.00% |  | 28.00% |  | 35.00% |  |  |  |  |  |  |  |
Total income taxes paid to all jurisdictions |  |  |  | 1,300,000,000 |  | 1,800,000,000 |  | 3,400,000,000 |  |  |  |  |  |  |  |
Tax refunds received from all jurisdictions |  |  |  | 270,000,000 |  | 69,000,000 |  | 15,000,000 |  |  |  |  |  |  |  |
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign tax credits | 2,144,000,000 |  | 2,144,000,000 | 2,144,000,000 |  | 2,022,000,000 |  |  |  |  |  |  |  |  |  |
Accrued expenses | 1,098,000,000 |  | 1,098,000,000 | 1,098,000,000 |  | 819,000,000 |  |  |  |  |  |  |  |  |  |
Minimum tax credits | 603,000,000 |  | 603,000,000 | 603,000,000 |  | 474,000,000 |  |  |  |  |  |  |  |  |  |
Net operating loss carryforwards | 925,000,000 |  | 925,000,000 | 925,000,000 |  | 343,000,000 |  |  |  |  |  |  |  |  |  |
Employee benefit plans | 443,000,000 |  | 443,000,000 | 443,000,000 |  | 315,000,000 |  |  |  |  |  |  |  |  |  |
Other | 557,000,000 |  | 557,000,000 | 557,000,000 |  | 374,000,000 |  |  |  |  |  |  |  |  |  |
Deferred tax assets | 5,770,000,000 |  | 5,770,000,000 | 5,770,000,000 |  | 4,347,000,000 |  |  |  |  |  |  |  |  |  |
Valuation allowances | (2,487,000,000) |  | (2,487,000,000) | (2,487,000,000) |  | (2,443,000,000) |  |  |  |  |  |  |  |  |  |
Net deferred tax assets | 3,283,000,000 |  | 3,283,000,000 | 3,283,000,000 |  | 1,904,000,000 |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant, equipment and development costs | (4,887,000,000) |  | (4,887,000,000) | (4,887,000,000) |  | (4,462,000,000) |  |  |  |  |  |  |  |  |  |
Oil and gas properties | (4,708,000,000) |  | (4,708,000,000) | (4,708,000,000) |  | 0 |  |  |  |  |  |  |  |  |  |
Undistributed earnings | (936,000,000) |  | (936,000,000) | (936,000,000) |  | (884,000,000) |  |  |  |  |  |  |  |  |  |
Other | (34,000,000) |  | (34,000,000) | (34,000,000) |  | (70,000,000) |  |  |  |  |  |  |  |  |  |
Total deferred tax liabilities | (10,565,000,000) |  | (10,565,000,000) | (10,565,000,000) |  | (5,416,000,000) |  |  |  |  |  |  |  |  |  |
Net deferred tax liabilities | (7,282,000,000) |  | (7,282,000,000) | (7,282,000,000) |  | (3,512,000,000) |  |  |  |  |  |  |  |  |  |
Valuation allowance on deferred tax asset increase (decrease) during period |  |  |  | $ 44,000,000 |  |  |  |  |  |  |  |  |  |  |  |
[1] | As a result of the oil and gas acquisitions, FCX recognized a net tax benefit of $199 million consisting of income tax benefits of $190 million associated with net reductions in FCX's valuation allowances, $69 million related to the release of the deferred tax liability on PXP's investment in MMR common stock and $16 million associated with the revaluation of state deferred tax liabilities, partially offset by income tax expense of $76 million associated with the write off of deferred tax assets related to environmental liabilities.
[2] | With the exception of TFM, FCX has not elected to permanently reinvest earnings from its foreign subsidiaries and has recorded deferred tax liabilities for foreign earnings that are available to be repatriated to the U.S. Cerro Verde previously recorded deferred Peruvian income tax liabilities for income taxes that would become payable if the reinvested profits used to fund the initial Cerro Verde sulfide expansion were distributed prior to the expiration of Cerro Verde's 1998 stability agreement on December 31, 2013. Because reinvested profits at Cerro Verde were not expected to be distributed prior to December 31, 2013, a net deferred income tax liability of $234 million was reversed and recognized as an income tax benefit in 2012.
[3] | In 2012, Sociedad Minera Cerro Verde S.A.A. (Cerro Verde) signed a new 15-year mining stability agreement with the Peruvian government, which became effective January 1, 2014. In connection with the new mining stability agreement, Cerro Verde's income tax rate increased from 30 percent to 32 percent, and FCX recognized additional deferred tax expense of $29 million.
[4] | In September 2011, Peru enacted a new mining tax and royalty regime and also created a special mining burden that companies with stability agreements could elect to pay. Cerro Verde elected to pay this special mining burden during the remaining term of its 1998 stability agreement, which expired on December 31, 2013. As a result, Cerro Verde recognized additional tax expense of $53 million
[5] | Benefit from the use of federal operating loss carryforwards acquired as part of the oil and gas acquisitions.
[6] | Included the reversal of Cerro Verde's deferred income tax liability of $234 million.
[7] | Included a net tax benefit of $199 million as a result of the oil and gas acquisitions.

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