Consolidated Statement of Equity (Unaudited) (USD $) In Millions, unless otherwise specified	Total	Total FCX Stockholders' Equity [Member]	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Common Stock Held in Treasury [Member]	Noncontrolling Interests [Member]
Balance at Dec. 31, 2013	$ 25,231	$ 20,934	$ 117	$ 22,161	$ 2,742	$ (405)	$ (3,681)	$ 4,297
Balance (in shares) at Dec. 31, 2013			1,165				127
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercised and issued stock-based awards	8	8	0	8	0	0	0	0
Exercised and issued stock-based awards (in shares)			1				0
Stock-based compensation	52	52	0	52	0	0	0	0
Tender of shares for stock-based awards	(5)	(5)	0	0	0	0	(5)	0
Tender of shares for stock-based awards (in shares)			0				0
Dividends on common stock	(653)	(653)	0	0	(653)	0	0	0
Dividends to noncontrolling interests	(236)	0	0	0	0	0	0	(236)
Net income attributable to FCX common stockholders	992	992	0	0	992	0	0	0
Net income attributable to noncontrolling interests	274	0	0	0	0	0	0	274
Other comprehensive income	4	4	0	0	0	4	0	0
Balance at Jun. 30, 2014	$ 25,667	$ 21,332	$ 117	$ 22,221	$ 3,081	$ (401)	$ (3,686)	$ 4,335
Balance (in shares) at Jun. 30, 2014			1,166				127