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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2013 | Dec. 31, 2013
Schedule of Significant Accounting Policies [Line Items] |  |
Minimum ownership percentage of subsidiary for inclusion in consolidated financial statements |  | 50.00%
Percentage of ultimate copper recovery from leach stockpiles |  | 90.00%
Threshhold for Determining Accounting Treatment for Oil and Gas Dispositions |  | 25.00%
Fair Value Inputs, Discount Rate |  | 10.00%
Amount of Natural Gas Sales Priced Using Industry Pricing Index, Percentage |  | 50.00%
Minimum [Member] |  |
Schedule of Significant Accounting Policies [Line Items] |  |
Ownership percentage for investment in unconsolidated companies accounted for using the equity method |  | 20.00%
Maximum [Member] |  |
Schedule of Significant Accounting Policies [Line Items] |  |
Ownership percentage for investments in unconsolidated companies carried at cost |  | 20.00%
Percentage of copper ultimately recoverable from newly placed material on active stockpiles extracted during the first year |  | 80.00%
PT Freeport Indonesia [Member] |  |
Schedule of Significant Accounting Policies [Line Items] |  |
Ownership percentage of subsidiary |  | 90.64%
Plains Exploration & Production Company [Member] |  |
Schedule of Significant Accounting Policies [Line Items] |  |
Business Acquisition, Effective Date of Acquisition | May 31, 2013 | May 31, 2013
Business Acquisition, Date Results Included in Combined Entity |  | Jun. 01, 2013
McMoRan Exploration Co [Member] |  |
Schedule of Significant Accounting Policies [Line Items] |  |
Business Acquisition, Effective Date of Acquisition |  | Jun. 03, 2013
Business Acquisition, Date Results Included in Combined Entity |  | Jun. 04, 2013
Oil and Gas Operations Segment [Member] |  |
Schedule of Significant Accounting Policies [Line Items] |  |
Interest Costs Capitalized |  | $ 69

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