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CONTINGENCIES (Details) In Millions, unless otherwise specified | 12 Months Ended |  | 1 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2013 Cerro Verde [Member] Minimum [Member] | Dec. 31, 2013 Cerro Verde [Member] Maximum [Member] | Jul. 31, 2013 PT Freeport Indonesia [Member] USD ($) | Dec. 31, 2013 PT Freeport Indonesia [Member] USD ($) | Oct. 31, 2010 Relating To 2005 [Member] PT Freeport Indonesia [Member] USD ($) | Nov. 30, 2011 Relating To 2006 [Member] PT Freeport Indonesia [Member] USD ($) | Mar. 31, 2012 Relating To 2007 [Member] PT Freeport Indonesia [Member] USD ($) | Mar. 31, 2013 Relating To 2008 [Member] PT Freeport Indonesia [Member] USD ($) | Dec. 31, 2013 Relating To 2011 [Member] PT Freeport Indonesia [Member] USD ($) | Jun. 30, 2013 Relating To 2011 [Member] PT Freeport Indonesia [Member] USD ($) | Dec. 31, 2013 Relating To 2005 and 2007 [Member] PT Freeport Indonesia [Member] USD ($) | Dec. 31, 2013 Relating to the Period October 2006 through December 2008 [Member] Cerro Verde [Member] USD ($) | Dec. 31, 2013 Relating to the Period October 2006 through December 2008 [Member] Cerro Verde [Member] PEN | Dec. 31, 2013 Relating to 2009 [Member] Cerro Verde [Member] USD ($) | Dec. 31, 2013 Relating to 2009 [Member] Cerro Verde [Member] PEN | Dec. 31, 2013 Tax Assessment [Member] PT Freeport Indonesia [Member] USD ($) | Oct. 31, 2010 Tax Assessment [Member] Relating To 2005 [Member] PT Freeport Indonesia [Member] USD ($) | Nov. 30, 2011 Tax Assessment [Member] Relating To 2006 [Member] PT Freeport Indonesia [Member] USD ($) | Mar. 31, 2012 Tax Assessment [Member] Relating To 2007 [Member] PT Freeport Indonesia [Member] USD ($) | Mar. 31, 2013 Tax Assessment [Member] Relating To 2008 [Member] PT Freeport Indonesia [Member] USD ($) | Jun. 30, 2013 Tax Assessment [Member] Relating To 2011 [Member] PT Freeport Indonesia [Member] USD ($) | Dec. 31, 2013 Interest Assessment [Member] PT Freeport Indonesia [Member] USD ($) | Oct. 31, 2010 Interest Assessment [Member] Relating To 2005 [Member] PT Freeport Indonesia [Member] USD ($) | Nov. 30, 2011 Interest Assessment [Member] Relating To 2006 [Member] PT Freeport Indonesia [Member] USD ($) | Mar. 31, 2012 Interest Assessment [Member] Relating To 2007 [Member] PT Freeport Indonesia [Member] USD ($) | Mar. 31, 2013 Interest Assessment [Member] Relating To 2008 [Member] PT Freeport Indonesia [Member] USD ($) | Jun. 30, 2013 Interest Assessment [Member] Relating To 2011 [Member] PT Freeport Indonesia [Member] USD ($) | Dec. 31, 2013 Interest Assessment [Member] Relating to the Period October 2006 through December 2008 [Member] Cerro Verde [Member] USD ($) | Dec. 31, 2013 Other Assets [Member] PT Freeport Indonesia [Member] USD ($)
Site Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reasonably Possible Interest Penalties |  |  |  | 7.00% | 18.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of active remediation projects in the United States (in number of projects) | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approximate number of states with active remediation projects (in number of states) | 28 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessment By Foreign Government of Alleged Obligations, Expressed in Foreign Currency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 492 |  | 206 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessment By Foreign Government Of Alleged Obligations |  |  |  |  |  |  | 502 | 152 | 32 | 135 | 114 |  | 69 |  | 176 |  | 74 |  | 334 | 103 | 22 | 91 | 62 | 56 | 168 | 49 | 10 | 44 | 52 | 13 | 104 |
Assessment By Foreign Government Of Alleged Obligations, Net of Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94 |  | 39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Overpayment, Amount Agreed to by Tax Authority |  |  |  |  |  |  | 291 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Overpayment |  |  |  |  |  |  | 320 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Income Tax Refunds | 270 | 69 | 15 |  |  | 165 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disputed Tax Assessments Receivable |  |  |  |  |  |  |  |  |  |  |  | $ 22 |  | $ 126 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 255

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