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Contingencies and Commitments (Unaudited) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Loss Contingencies [Line Items] |
Term to construct smelter | 5 years
Tax Authority, In Papau, Indonesia [Member] | Relating to January 2016 through April 2016 [Member] | PT Freeport Indonesia [Member] |
Loss Contingencies [Line Items] |
Loss Contingency, Estimate of Possible Loss | $ 13
Change in Loss Contingency, percent | 40.00%
Tax Authority, In Papau, Indonesia [Member] | Relating to August 2015 through March 2018 [Member] | PT Freeport Indonesia [Member] |
Loss Contingencies [Line Items] |
Loss Contingency, Estimate of Possible Loss | $ 161
Penalties [Member] | Tax Authority, In Papau, Indonesia [Member] | Relating to August 2015 through March 2018 [Member] | PT Freeport Indonesia [Member] |
Loss Contingencies [Line Items] |
Loss Contingency, Estimate of Possible Loss | $ 81
PT Freeport Indonesia [Member] |
Loss Contingencies [Line Items] |
Divestment percentage | 51.00%
PT Freeport Indonesia [Member] | PT Indocopper Investama [Member] |
Loss Contingencies [Line Items] |
Investment Owned, Percent of Net Assets | 9.36%
David Garcia v. Freeport-McMoRan Oil & Gas LLC Litigation [Member] | Minimum [Member] |
Loss Contingencies [Line Items] |
Loss Contingency, Estimate of Possible Loss | $ 50
David Garcia v. Freeport-McMoRan Oil & Gas LLC Litigation [Member] | Maximum [Member] |
Loss Contingencies [Line Items] |
Loss Contingency, Estimate of Possible Loss | $ 80

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