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