ACQUISITIONS (Pro Forma) (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Revenues			$ 23,075,000,000	$ 22,713,000,000
Operating income			6,267,000,000	6,815,000,000
Income from continuing operations			3,626,000,000	4,277,000,000
Net income attributable to FCX common stockholders			2,825,000,000	3,301,000,000
Net income per share attributable to FCX common stockholders, basic			$ 2.71	$ 3.17
Net income per share attributable to FCX common stockholders, diluted			$ 2.70	$ 3.16
Business Combination, Acquisition Related Costs, Including Acquiree Costs			519,000,000
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances	16,000,000	183,000,000	199,000,000
Gain on investment in McMoRan Exploration Co. (MMR)			128,000,000	0	0
Gain (Loss) on Disposition of Oil and Gas Property			$ 77,000,000