Business Segments (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Sep. 30, 2014	Dec. 31, 2014
Revenues:
Unaffiliated customers	$ 4,153		$ 4,985
Intersegment	0		0
Production and delivery	2,912		2,737
Depreciation, depletion and amortization	939		966
Impairment of oil and gas properties	3,104		0
Selling, general and administrative expenses	154		135
Mining exploration and research expenses	33		30
Environmental obligations and shutdown costs	13		6
Net gain on sale of assets	(39)		0
Operating income (loss)	(2,963)		1,111
Interest expense, net	146		161
Provision for (benefit from) income taxes	(695)		357
Total Assets	56,065		63,732			58,674
Capital expenditures	1,867		1,612
Mining Operations [Member]
Revenues:
Unaffiliated customers	3,653		3,724
Intersegment	0		0
Production and delivery	2,626		2,426
Depreciation, depletion and amortization	405		346
Impairment of oil and gas properties	0
Selling, general and administrative expenses	41		38
Mining exploration and research expenses	33		30
Environmental obligations and shutdown costs	13		6
Net gain on sale of assets	(39)
Operating income (loss)	574		878
Interest expense, net	45		23
Provision for (benefit from) income taxes	79		169
Total Assets	37,976		36,858
Capital expenditures	840		1,024
North America Copper Mines [Member]
Revenues:
Unaffiliated customers	221		84
Intersegment	1,114		1,202
Production and delivery	943		786
Depreciation, depletion and amortization	133		107
Impairment of oil and gas properties	0
Selling, general and administrative expenses	1		1
Mining exploration and research expenses	3		2
Environmental obligations and shutdown costs	0		0
Net gain on sale of assets	(39)
Operating income (loss)	294		390
Interest expense, net	1		1
Provision for (benefit from) income taxes	0		0
Total Assets	9,448		9,239
Capital expenditures	107		303
Morenci [Member]
Revenues:
Unaffiliated customers	106		23
Intersegment	450		444
Production and delivery	374		283
Depreciation, depletion and amortization	51		34
Impairment of oil and gas properties	0
Selling, general and administrative expenses	1		0
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Net gain on sale of assets	0
Operating income (loss)	130		150
Interest expense, net	1		1
Provision for (benefit from) income taxes	0		0
Total Assets	3,802		3,412
Capital expenditures	84		244
Other North America Copper Mines [Member]
Revenues:
Unaffiliated customers	115		61
Intersegment	664		758
Production and delivery	569		503
Depreciation, depletion and amortization	82		73
Impairment of oil and gas properties	0
Selling, general and administrative expenses	0		1
Mining exploration and research expenses	3		2
Environmental obligations and shutdown costs	0		0
Net gain on sale of assets	(39)
Operating income (loss)	164		240
Interest expense, net	0		0
Provision for (benefit from) income taxes	0		0
Total Assets	5,646		5,827
Capital expenditures	23		59
South America Mines [Member]
Revenues:
Unaffiliated customers	479		702
Intersegment	7		196
Production and delivery	345		476
Depreciation, depletion and amortization	75		87
Impairment of oil and gas properties	0
Selling, general and administrative expenses	1		2
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Net gain on sale of assets	0
Operating income (loss)	65		333
Interest expense, net	1		0
Provision for (benefit from) income taxes	24		127
Total Assets	9,961		10,789
Capital expenditures	445		423
Cerro Verde [Member]
Revenues:
Unaffiliated customers	248		280
Intersegment	14		64
Production and delivery	198		165
Depreciation, depletion and amortization	37		36
Impairment of oil and gas properties	0
Selling, general and administrative expenses	1		1
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Net gain on sale of assets	0
Operating income (loss)	26		142
Interest expense, net	1		0
Provision for (benefit from) income taxes	5		57
Total Assets	7,991		6,730
Capital expenditures	431		400
Other South America Mines [Member]
Revenues:
Unaffiliated customers	231	[1]	422	[1]
Intersegment	(7)	[1],[2]	132	[1]
Production and delivery	147	[1]	311	[1]
Depreciation, depletion and amortization	38	[1]	51	[1]
Impairment of oil and gas properties	0	[1]
Selling, general and administrative expenses	0	[1]	1	[1]
Mining exploration and research expenses	0	[1]	0	[1]
Environmental obligations and shutdown costs	0	[1]	0	[1]
Net gain on sale of assets	0	[1]
Operating income (loss)	39	[1]	191	[1]
Interest expense, net	0	[1]	0	[1]
Provision for (benefit from) income taxes	19	[1]	70	[1]
Total Assets	1,970	[1]	4,059	[1]
Capital expenditures	14	[1]	23	[1]
Indonesia - Grasberg [Member]
Revenues:
Unaffiliated customers	621	[3]	462	[3]
Intersegment	(14)	[2]	8
Production and delivery	439		383
Depreciation, depletion and amortization	70		48
Impairment of oil and gas properties	0
Selling, general and administrative expenses	25		21
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Net gain on sale of assets	0
Operating income (loss)	73		18
Interest expense, net	0		0
Provision for (benefit from) income taxes	29		18
Total Assets	8,882		7,466
Capital expenditures	225		236
Africa - Tenke [Member]
Revenues:
Unaffiliated customers	382		306
Intersegment	28		21
Production and delivery	235		152
Depreciation, depletion and amortization	73		51
Impairment of oil and gas properties	0
Selling, general and administrative expenses	3		3
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Net gain on sale of assets	0
Operating income (loss)	99		121
Interest expense, net	0		0
Provision for (benefit from) income taxes	26		24
Total Assets	5,108		4,904
Capital expenditures	39		31
Molybdenum mines [Member]
Revenues:
Unaffiliated customers	0		0
Intersegment	113		126
Production and delivery	83		76
Depreciation, depletion and amortization	26		22
Impairment of oil and gas properties	0
Selling, general and administrative expenses	0		0
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Net gain on sale of assets	0
Operating income (loss)	4		28
Interest expense, net	0		0
Provision for (benefit from) income taxes	0		0
Total Assets	2,075		2,101
Capital expenditures	3		19
Rod & Refining [Member]
Revenues:
Unaffiliated customers	1,062		1,146
Intersegment	7		8
Production and delivery	1,063		1,148
Depreciation, depletion and amortization	2		2
Impairment of oil and gas properties	0
Selling, general and administrative expenses	0		0
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Net gain on sale of assets	0
Operating income (loss)	4		4
Interest expense, net	0		0
Provision for (benefit from) income taxes	0		0
Total Assets	314		289
Capital expenditures	1		1
Atlantic Copper Smelting & Refining [Member]
Revenues:
Unaffiliated customers	540		588
Intersegment	6		5
Production and delivery	519		588
Depreciation, depletion and amortization	10		10
Impairment of oil and gas properties	0
Selling, general and administrative expenses	5		4
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Net gain on sale of assets	0
Operating income (loss)	12		(9)
Interest expense, net	3		4
Provision for (benefit from) income taxes	0		0
Total Assets	809		951
Capital expenditures	4		1
Other Mining & Eliminations [Member]
Revenues:
Unaffiliated customers	348	[4]	436	[4]
Intersegment	(1,261)		(1,566)
Production and delivery	(1,001)		(1,183)
Depreciation, depletion and amortization	16		19
Impairment of oil and gas properties	0
Selling, general and administrative expenses	6		7
Mining exploration and research expenses	30		28
Environmental obligations and shutdown costs	13		6
Net gain on sale of assets	0
Operating income (loss)	23		(7)
Interest expense, net	40		18
Provision for (benefit from) income taxes	0		0
Total Assets	1,379		1,119
Capital expenditures	16		10
U.S. Oil & Gas Operations [Member]
Revenues:
Unaffiliated customers	500	[5],[6]	1,261	[5],[6]
Intersegment	0	[6]	0	[6]
Production and delivery	283	[6]	311	[6]
Depreciation, depletion and amortization	530	[6]	616	[6]
Impairment of oil and gas properties	3,104	[6]
Selling, general and administrative expenses	54	[6]	57	[6]
Mining exploration and research expenses	0	[6]	0	[6]
Environmental obligations and shutdown costs	0	[6]	0	[6]
Net gain on sale of assets	0	[6]
Operating income (loss)	(3,471)	[6]	277	[6]
Interest expense, net	37	[6]	76	[6]
Provision for (benefit from) income taxes	0	[6]	0	[6]
Total Assets	17,887	[6]	26,385	[6]
Capital expenditures	1,018	[6]	579	[6]
Corporate, Other & Eliminations [Member]
Revenues:
Unaffiliated customers	0		0
Intersegment	0		0
Production and delivery	3		0
Depreciation, depletion and amortization	4		4
Impairment of oil and gas properties	0
Selling, general and administrative expenses	59		40
Mining exploration and research expenses	0		0
Environmental obligations and shutdown costs	0		0
Net gain on sale of assets	0
Operating income (loss)	(66)		(44)
Interest expense, net	64		62
Provision for (benefit from) income taxes	(774)		188
Total Assets	202		489
Capital expenditures	9		9
Crude oil and natural gas swaps [Member]
Revenues:
Net mark-to-market gains (losses) on derivative contracts	52		(50)
Pt Smelting [Member]
Segment Reporting Information [Line Items]
Deferred Intercompany Profit, Percentage					25.00%
Revenues:
Revenues	$ 350		$ 373

[1] First-quarter 2014 amounts include the results of the Candelaria and Ojos del Salado mining operations, which were sold in November 2014.

[2] Amounts include net reductions for provisional pricing adjustments to prior period open sales. There were no intersegment sales from El Abra or Grasberg in first-quarter 2015.

[3] Includes PT-FI’s sales to PT Smelting totaling $350 million in first-quarter 2015 and $373 million in first-quarter 2014.

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

[5] Includes net mark-to-market gains (losses) associated with crude oil and natural gas derivative contracts totaling $52 million in first-quarter 2015 and $(50) million in first-quarter 2014.

[6] First-quarter 2014 includes the results from Eagle Ford, which was sold in June 2014.