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Contingencies and Commitments (Unaudited) Tax and Other Matters (Details) - PT Freeport Indonesia [Member] - Tax Authority, In Papau, Indonesia [Member] - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Relating to January 2016 through April 2016 [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 12 | $ 20
Change in Loss Contingency, percent | 40.00% |
Relating to August 2015 through March 2018 [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 169 |
Relating to August 2015 through March 2018 [Member] | Penalties [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Estimate of Possible Loss | $ 85 |

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