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Contingencies and Commitments (Unaudited) (Details) (USD $) |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2012 Cerro Verde [Member] Relating to the Period October 2006 through December 2008 [Member] | Jun. 30, 2012 Cerro Verde [Member] Relating to the Period October 2006 through December 2008 [Member] Tax Assessment [Member] | Jun. 30, 2012 Cerro Verde [Member] Relating to the Period October 2006 through December 2009 [Member] | Jul. 31, 2013 PT Freeport Indonesia [Member] | Jun. 30, 2013 PT Freeport Indonesia [Member] | Jun. 30, 2013 PT Freeport Indonesia [Member] Relating To 2008 [Member] Tax Assessment [Member] | Jun. 30, 2013 PT Freeport Indonesia [Member] Relating To 2008 [Member] Interest Assessment [Member] | Jun. 30, 2013 PT Freeport Indonesia [Member] Relating To 2011 [Member] | Jun. 30, 2013 PT Freeport Indonesia [Member] Relating To 2005 and 2007 [Member] | Jun. 30, 2013 Freeport-McMoRan Oil & Gas [Member] | Jun. 30, 2012 Minimum [Member] Cerro Verde [Member] | Jun. 30, 2012 Maximum [Member] Cerro Verde [Member] | Jun. 30, 2013 Other Assets [Member] PT Freeport Indonesia [Member] | Jun. 30, 2013 Ultra-deepwater Drillship Contracts [Member] Freeport-McMoRan Oil & Gas [Member] | Jun. 30, 2013 Deferred Option Premiums and Accrued Interest [Member] Freeport-McMoRan Oil & Gas [Member]
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign government assessment in connection with alleged obligations | $ 175,000,000 | $ 73,000,000 | $ 245,000,000 |  |  | $ 59,000,000 | $ 55,000,000 |  |  |  |  |  |  |  |
Reasonably Possible Interest Penalties |  |  |  |  |  |  |  |  |  |  | 7.00% | 18.00% |  |  |
Tax Overpayment, Amount Agreed to by Tax Authority |  |  |  |  | 291,000,000 |  |  |  |  |  |  |  |  |  |
Tax Overpayment |  |  |  |  | 320,000,000 |  |  |  |  |  |  |  |  |  |
Disputed tax assessments paid |  |  |  |  |  |  |  | 21,000,000 | 126,000,000 |  |  |  | 265,000,000 |  |
Proceeds from Income Tax Refunds |  |  |  | 165,000,000 |  |  |  |  |  |  |  |  |  |  |
Unconditional Purchase Obligations |  |  |  |  |  |  |  |  |  | 2,200,000,000 |  |  |  | 1,300,000,000 | 490,000,000
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 |  |  |  |  |  |  |  |  |  | 1,430,000,000 |  |  |  |  |
2014 |  |  |  |  |  |  |  |  |  | 267,000,000 |  |  |  |  |
2015 |  |  |  |  |  |  |  |  |  | 272,000,000 |  |  |  |  |
2016 |  |  |  |  |  |  |  |  |  | 70,000,000 |  |  |  |  |
2017 |  |  |  |  |  |  |  |  |  | 43,000,000 |  |  |  |  |
Thereafter |  |  |  |  |  |  |  |  |  | $ 124,000,000 |  |  |  |  |

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