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Contingencies and Commitments (Unaudited) (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($)
Loss Contingencies [Line Items] |  |
Progressive Export Duty on Copper Concentrates, Lower Threshold, Percent |  | 5.00%
PT Freeport Indonesia [Member] |  |
Loss Contingencies [Line Items] |  |
Income Tax Examination, Penalties and Interest Accrued | $ 0 | $ 0
National Superintendency of Tax Administration (SUNAT) [Member] | Relating to Tax Periods 2006 Through 2013 [Member] | Cerro Verde [Member] |  |
Loss Contingencies [Line Items] |  |
Income Tax Examination, Penalties and Interest Accrued | 582,000,000 | 582,000,000
Tax Authority, In Papau, Indonesia [Member] | Relating to 2011 through 2015 [Member] | PT Freeport Indonesia [Member] |  |
Loss Contingencies [Line Items] |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 380,000,000 | 380,000,000
Income tax examination, interest accrued | 229,000,000 | 229,000,000
Tax Authority, In Papau, Indonesia [Member] | Relating to August 2015 through March 2017 [Member] [Member] | PT Freeport Indonesia [Member] |  |
Loss Contingencies [Line Items] |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 126,000,000 | 126,000,000
Tax Authority, In Papau, Indonesia [Member] | Relating to 2011 through 2017 [Member] | PT Freeport Indonesia [Member] |  |
Loss Contingencies [Line Items] |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 506,000,000 | $ 506,000,000
Uranium Mining Sites on Tribal Land [Member] |  |
Loss Contingencies [Line Items] |  |
Environmental accrual, revision in estimate | $ (41,000,000) |

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- Definition Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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