Business Segments (Unaudited) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Revenues:
Unaffiliated customers	$ 4,985,000,000		$ 4,583,000,000
Intersegment	0		0
Production and delivery	2,737,000,000		2,719,000,000
Depreciation, depletion and amortization	966,000,000		329,000,000
Selling, general and administrative expenses	135,000,000		113,000,000
Mining exploration and research expenses	30,000,000		52,000,000
Environmental obligations and shutdown costs	6,000,000		15,000,000
Operating income (loss)	1,111,000,000		1,355,000,000
Interest expense, net	161,000,000		57,000,000
Provision for income taxes	357,000,000		428,000,000
Total assets	63,843,000,000		42,588,000,000		63,473,000,000
Capital expenditures	1,612,000,000		805,000,000
Mining Operations [Member]
Revenues:
Unaffiliated customers	3,724,000,000		4,581,000,000
Intersegment	0		0
Production and delivery	2,426,000,000		2,716,000,000
Depreciation, depletion and amortization	346,000,000		327,000,000
Selling, general and administrative expenses	38,000,000		45,000,000
Mining exploration and research expenses	30,000,000		49,000,000
Environmental obligations and shutdown costs	6,000,000		15,000,000
Operating income (loss)	878,000,000		1,429,000,000
Interest expense, net	23,000,000		27,000,000
Provision for income taxes	169,000,000		315,000,000
Total assets	36,885,000,000		34,800,000,000
Capital expenditures	1,024,000,000		797,000,000
North America Copper Mines [Member]
Revenues:
Unaffiliated customers	84,000,000		125,000,000
Intersegment	1,202,000,000		1,260,000,000
Production and delivery	786,000,000		799,000,000
Depreciation, depletion and amortization	107,000,000		102,000,000
Selling, general and administrative expenses	1,000,000		1,000,000
Mining exploration and research expenses	2,000,000		0
Environmental obligations and shutdown costs	0		(4,000,000)
Operating income (loss)	390,000,000		487,000,000
Interest expense, net	1,000,000		1,000,000
Provision for income taxes	0		0
Total assets	9,239,000,000		8,372,000,000
Capital expenditures	303,000,000		257,000,000
Morenci [Member]
Revenues:
Unaffiliated customers	23,000,000		80,000,000
Intersegment	444,000,000		436,000,000
Production and delivery	283,000,000		297,000,000
Depreciation, depletion and amortization	34,000,000		33,000,000
Selling, general and administrative expenses	0		0
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Operating income (loss)	150,000,000		186,000,000
Interest expense, net	1,000,000		1,000,000
Provision for income taxes	0		0
Total assets	3,412,000,000		2,589,000,000
Capital expenditures	244,000,000		153,000,000
Other North America Copper Mines [Member]
Revenues:
Unaffiliated customers	61,000,000		45,000,000
Intersegment	758,000,000		824,000,000
Production and delivery	503,000,000		502,000,000
Depreciation, depletion and amortization	73,000,000		69,000,000
Selling, general and administrative expenses	1,000,000		1,000,000
Mining exploration and research expenses	2,000,000		0
Environmental obligations and shutdown costs	0		(4,000,000)
Operating income (loss)	240,000,000		301,000,000
Interest expense, net	0		0
Provision for income taxes	0		0
Total assets	5,827,000,000		5,783,000,000
Capital expenditures	59,000,000		104,000,000
South America Mines [Member]
Revenues:
Unaffiliated customers	702,000,000		850,000,000
Intersegment	196,000,000		164,000,000
Production and delivery	476,000,000		475,000,000
Depreciation, depletion and amortization	87,000,000		71,000,000
Selling, general and administrative expenses	2,000,000		1,000,000
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Operating income (loss)	333,000,000		467,000,000
Interest expense, net	0		0
Provision for income taxes	127,000,000		151,000,000
Total assets	10,816,000,000		10,327,000,000
Capital expenditures	423,000,000		226,000,000
Cerro Verde [Member]
Revenues:
Unaffiliated customers	280,000,000		290,000,000
Intersegment	64,000,000		109,000,000
Production and delivery	165,000,000		171,000,000
Depreciation, depletion and amortization	36,000,000		33,000,000
Selling, general and administrative expenses	1,000,000		0
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Operating income (loss)	142,000,000		195,000,000
Interest expense, net	0		0
Provision for income taxes	57,000,000		64,000,000
Total assets	6,757,000,000		5,968,000,000
Capital expenditures	400,000,000		164,000,000
Candelaria [Member]
Revenues:
Unaffiliated customers	128,000,000		253,000,000
Intersegment	128,000,000		55,000,000
Production and delivery	150,000,000		167,000,000
Depreciation, depletion and amortization	19,000,000		9,000,000
Selling, general and administrative expenses	0		1,000,000
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Operating income (loss)	87,000,000		131,000,000
Interest expense, net	0		0
Provision for income taxes	36,000,000		44,000,000
Total assets	1,591,000,000		1,852,000,000
Capital expenditures	10,000,000		40,000,000
Other South America Mines [Member]
Revenues:
Unaffiliated customers	294,000,000		307,000,000
Intersegment	4,000,000		0
Production and delivery	161,000,000		137,000,000
Depreciation, depletion and amortization	32,000,000		29,000,000
Selling, general and administrative expenses	1,000,000		0
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Operating income (loss)	104,000,000		141,000,000
Interest expense, net	0		0
Provision for income taxes	34,000,000		43,000,000
Total assets	2,468,000,000		2,507,000,000
Capital expenditures	13,000,000		22,000,000
Indonesia - Grasberg [Member]
Revenues:
Unaffiliated customers	462,000,000	[1]	864,000,000	[1]
Intersegment	8,000,000		67,000,000
Production and delivery	383,000,000		563,000,000
Depreciation, depletion and amortization	48,000,000		55,000,000
Selling, general and administrative expenses	21,000,000		26,000,000
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Operating income (loss)	18,000,000		287,000,000
Interest expense, net	0		2,000,000
Provision for income taxes	18,000,000		120,000,000
Total assets	7,466,000,000		6,862,000,000
Capital expenditures	236,000,000		191,000,000
Africa - Tenke [Member]
Revenues:
Unaffiliated customers	306,000,000		438,000,000
Intersegment	21,000,000		0
Production and delivery	152,000,000		185,000,000
Depreciation, depletion and amortization	51,000,000		58,000,000
Selling, general and administrative expenses	3,000,000		3,000,000
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Operating income (loss)	121,000,000		192,000,000
Interest expense, net	0		0
Provision for income taxes	24,000,000		44,000,000
Total assets	4,904,000,000		4,894,000,000
Capital expenditures	31,000,000		57,000,000
Molybdenum mines [Member]
Revenues:
Unaffiliated customers	0		0
Intersegment	126,000,000		143,000,000
Production and delivery	76,000,000		80,000,000
Depreciation, depletion and amortization	22,000,000		20,000,000
Selling, general and administrative expenses	0		0
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Operating income (loss)	28,000,000		43,000,000
Interest expense, net	0		0
Provision for income taxes	0		0
Total assets	2,101,000,000		2,033,000,000
Capital expenditures	19,000,000		40,000,000
Rod & Refining [Member]
Revenues:
Unaffiliated customers	1,146,000,000		1,330,000,000
Intersegment	8,000,000		7,000,000
Production and delivery	1,148,000,000		1,328,000,000
Depreciation, depletion and amortization	2,000,000		3,000,000
Selling, general and administrative expenses	0		0
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Operating income (loss)	4,000,000		6,000,000
Interest expense, net	0		0
Provision for income taxes	0		0
Total assets	289,000,000		316,000,000
Capital expenditures	1,000,000		1,000,000
Atlantic Copper Smelting & Refining [Member]
Revenues:
Unaffiliated customers	588,000,000		633,000,000
Intersegment	5,000,000		6,000,000
Production and delivery	588,000,000		628,000,000
Depreciation, depletion and amortization	10,000,000		10,000,000
Selling, general and administrative expenses	4,000,000		5,000,000
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Operating income (loss)	(9,000,000)		(4,000,000)
Interest expense, net	4,000,000		4,000,000
Provision for income taxes	0		0
Total assets	951,000,000		918,000,000
Capital expenditures	1,000,000		8,000,000
Other Mining & Eliminations [Member]
Revenues:
Unaffiliated customers	436,000,000	[2]	341,000,000	[2]
Intersegment	(1,566,000,000)		(1,647,000,000)
Production and delivery	(1,183,000,000)		(1,342,000,000)
Depreciation, depletion and amortization	19,000,000		8,000,000
Selling, general and administrative expenses	7,000,000		9,000,000
Mining exploration and research expenses	28,000,000		49,000,000
Environmental obligations and shutdown costs	6,000,000		19,000,000
Operating income (loss)	(7,000,000)		(49,000,000)
Interest expense, net	18,000,000		20,000,000
Provision for income taxes	0		0
Total assets	1,119,000,000		1,078,000,000
Capital expenditures	10,000,000		17,000,000
Oil & Gas Operations [Member]
Revenues:
Unaffiliated customers	1,261,000,000	[3]	0
Intersegment	0		0
Production and delivery	311,000,000		0
Depreciation, depletion and amortization	616,000,000		0
Selling, general and administrative expenses	57,000,000		0
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Operating income (loss)	277,000,000		0
Interest expense, net	76,000,000		0
Provision for income taxes	0		0
Total assets	26,385,000,000		0
Capital expenditures	579,000,000		0
Corporate, Other & Eliminations [Member]
Revenues:
Unaffiliated customers	0		2,000,000
Intersegment	0		0
Production and delivery	0		3,000,000
Depreciation, depletion and amortization	4,000,000		2,000,000
Selling, general and administrative expenses	40,000,000		68,000,000
Mining exploration and research expenses	0		3,000,000
Environmental obligations and shutdown costs	0		0
Operating income (loss)	(44,000,000)		(74,000,000)
Interest expense, net	62,000,000		30,000,000
Provision for income taxes	188,000,000		113,000,000
Total assets	573,000,000		7,788,000,000	[4]
Capital expenditures	9,000,000		8,000,000
Crude oil and natural gas swaps [Member]
Revenues:
Net mark-to-market losses on derivative contracts	(50,000,000)
Senior Notes [Member]
Revenues:
Proceeds from Issuance of Long-term Debt			6,400,000,000
Pt Smelting [Member]
Segment Reporting Information [Line Items]
Deferred Intercompany Profit, Percentage	25.00%
Revenues:
Revenues	$ 373,000,000		$ 430,000,000

[1] Included PT-FI’s sales to PT Smelting totaling $373 million in first-quarter 2014 and $430 million in first-quarter 2013.

[2] Included revenues from FCX's molybdenum sales company, which included sales of molybdenum produced by the Molybdenum mines and by certain of the North and South America copper mines.

[3] Included net mark-to-market losses associated with crude oil options and natural gas derivative contracts totaling $50 million.

[4] Included net proceeds of $6.4 billion from the March 2013 sale of senior notes that were used to fund the oil and gas acquisitions (see Note 6).