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Contingencies and Commitments (Unaudited) (Details) IDR in Trillions | Apr. 29, 2016 USD ($) | Apr. 29, 2016 IDR | Mar. 31, 2016 USD ($) | Dec. 31, 2014 USD ($)
--- | --- | --- | --- | ---
PT Freeport Indonesia [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Value Added Tax Receivable |  |  |  | $ 269,000,000
Income Tax Examination, Penalties Accrued |  |  | $ 0 |
Subsequent Event [Member] | PT Freeport Indonesia [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Assessment By Foreign Government Of Alleged Obligations | $ 207,000,000 |  |  |
Assessment By Foreign Government of Alleged Obligations, Expressed in Foreign Currency | IDR |  | IDR 2.7 |  |
Royalty Tax [Member] | Cerro Verde [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  | 515,000,000 |
RelatingtotheperiodDecember2006throughSeptember2011 [Member] | Royalty Tax [Member] | Cerro Verde [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Assessment By Foreign Government Of Alleged Obligations |  |  | 413,000,000 |
Cash and Cash Equivalents [Member] | PT Freeport Indonesia [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority |  |  | 196,000,000 |
Other Liabilities [Member] | PT Freeport Indonesia [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority |  |  | $ 38,000,000 |

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