GUARANTOR FINANCIAL STATEMENTS (Condensed Consolidated Cash Flow Statement) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Cash flow from operating activities:
Net (loss) income	$ (745)	[1],[2]	$ 3,441	[3]	$ 3,980
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, depletion and amortization	3,863		2,797		1,179
Impairment of oil and gas properties and goodwill	5,454
Net (gains) losses on crude oil and natural gas derivative contracts	(504)		334		0
Gain on investment in McMoRan Exploration Co. (MMR)	0		(128)		0
Equity in (earnings) losses of consolidated subsidiaries	(3)		0
Other, net	(1,802)		72
Increase (decrease) in working capital and changes in other tax payment, excluding amounts from the acquisitions	(632)		(377)
Net cash provided by operating activities	5,631		6,139		3,774
Cash flow from investing activities:
Capital expenditures	(7,215)		(5,286)		(3,494)
Acquisitions, net of cash acquired	(1,426)		(5,441)
Intercompany loans	0		0
Investment in consolidated subsidiary	0
Net proceeds from sale of Candelaria and Ojos del Salado	1,709		0		0
Net proceeds from sale of Eagle Ford shale assets	2,910		0		0
Dividends from consolidated subsidiary			0
Other, net	221		(181)		31
Net cash used in investing activities	(3,801)		(10,908)		(3,463)
Cash flow from financing activities:
Proceeds from Debt	8,710		11,501		3,029
Repayments of Debt and redemption of MMR preferred stock	(10,306)		5,704
Intercompany loans	0		0
Cash dividends and distributions paid, and contributions received	(1,729)		(2,537)
Other, net	(26)		(211)
Net cash (used in) provided by financing activities	(3,351)		3,049		(1,428)
Net decrease in cash and cash equivalents	(1,521)		(1,720)		(1,117)
Cash and cash equivalents at beginning of year	1,985		3,705		4,822
Cash and cash equivalents at end of year	464		1,985		3,705
FCX Issuer [Member]
Cash flow from operating activities:
Net (loss) income	(1,308)		2,658
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, depletion and amortization	4		4
Impairment of oil and gas properties and goodwill	0
Net (gains) losses on crude oil and natural gas derivative contracts	0		0
Gain on investment in McMoRan Exploration Co. (MMR)			(128)
Equity in (earnings) losses of consolidated subsidiaries	1,007		(2,886)
Other, net	(882)		8
Increase (decrease) in working capital and changes in other tax payment, excluding amounts from the acquisitions	723		272
Net cash provided by operating activities	(456)		(72)
Cash flow from investing activities:
Capital expenditures	0		0
Acquisitions, net of cash acquired	0		(5,437)
Intercompany loans	(1,328)		834
Investment in consolidated subsidiary	1,221
Net proceeds from sale of Candelaria and Ojos del Salado	0
Net proceeds from sale of Eagle Ford shale assets	0
Dividends from consolidated subsidiary			629
Other, net	0		15
Net cash used in investing activities	(107)		(3,959)
Cash flow from financing activities:
Proceeds from Debt	7,464		11,260
Repayments of Debt and redemption of MMR preferred stock	(5,575)		4,737
Intercompany loans	0		0
Cash dividends and distributions paid, and contributions received	(1,305)		(2,281)
Other, net	(21)		(211)
Net cash (used in) provided by financing activities	563		4,031
Net decrease in cash and cash equivalents	0		0
Cash and cash equivalents at beginning of year	0		0
Cash and cash equivalents at end of year	0		0
FM O&G LLC Guarantor [Member]
Cash flow from operating activities:
Net (loss) income	(4,348)		281
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, depletion and amortization	806		616
Impairment of oil and gas properties and goodwill	1,922
Net (gains) losses on crude oil and natural gas derivative contracts	(504)		334
Gain on investment in McMoRan Exploration Co. (MMR)			0
Equity in (earnings) losses of consolidated subsidiaries	3,429		(281)
Other, net	(113)		(14)
Increase (decrease) in working capital and changes in other tax payment, excluding amounts from the acquisitions	(1,750)		735
Net cash provided by operating activities	(558)		1,671
Cash flow from investing activities:
Capital expenditures	(2,143)		(894)
Acquisitions, net of cash acquired	0		0
Intercompany loans	704		0
Investment in consolidated subsidiary	(130)
Net proceeds from sale of Candelaria and Ojos del Salado	0
Net proceeds from sale of Eagle Ford shale assets	2,910
Dividends from consolidated subsidiary			0
Other, net	41		30
Net cash used in investing activities	1,382		(864)
Cash flow from financing activities:
Proceeds from Debt	0		0
Repayments of Debt and redemption of MMR preferred stock	(3,994)		416
Intercompany loans	810		(391)
Cash dividends and distributions paid, and contributions received	2,364		0
Other, net	(3)		0
Net cash (used in) provided by financing activities	(823)		(807)
Net decrease in cash and cash equivalents	1		0
Cash and cash equivalents at beginning of year	0		0
Cash and cash equivalents at end of year	1		0
Non-Guarantor Subsidiaries [Member]
Cash flow from operating activities:
Net (loss) income	(4,147)		3,934
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, depletion and amortization	3,077		2,177
Impairment of oil and gas properties and goodwill	3,486
Net (gains) losses on crude oil and natural gas derivative contracts	0		0
Gain on investment in McMoRan Exploration Co. (MMR)			0
Equity in (earnings) losses of consolidated subsidiaries	4,633		(265)
Other, net	(807)		78
Increase (decrease) in working capital and changes in other tax payment, excluding amounts from the acquisitions	395		(1,384)
Net cash provided by operating activities	6,637		4,540
Cash flow from investing activities:
Capital expenditures	(5,072)		(4,392)
Acquisitions, net of cash acquired	(1,426)		(4)
Intercompany loans	0		(162)
Investment in consolidated subsidiary	(2,408)
Net proceeds from sale of Candelaria and Ojos del Salado	1,709
Net proceeds from sale of Eagle Ford shale assets	0
Dividends from consolidated subsidiary			0
Other, net	180		(226)
Net cash used in investing activities	(7,017)		(4,784)
Cash flow from financing activities:
Proceeds from Debt	1,246		241
Repayments of Debt and redemption of MMR preferred stock	(737)		551
Intercompany loans	(186)		(281)
Cash dividends and distributions paid, and contributions received	(1,463)		(885)
Other, net	(2)		0
Net cash (used in) provided by financing activities	(1,142)		(1,476)
Net decrease in cash and cash equivalents	(1,522)		(1,720)
Cash and cash equivalents at beginning of year	1,985		3,705
Cash and cash equivalents at end of year	463		1,985
Eliminations [Member]
Cash flow from operating activities:
Net (loss) income	9,058		(3,432)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, depletion and amortization	(24)		0
Impairment of oil and gas properties and goodwill	46
Net (gains) losses on crude oil and natural gas derivative contracts	0		0
Gain on investment in McMoRan Exploration Co. (MMR)			0
Equity in (earnings) losses of consolidated subsidiaries	(9,072)		3,432
Other, net	0		0
Increase (decrease) in working capital and changes in other tax payment, excluding amounts from the acquisitions	0		0
Net cash provided by operating activities	8		0
Cash flow from investing activities:
Capital expenditures	0		0
Acquisitions, net of cash acquired	0		0
Intercompany loans	624		(672)
Investment in consolidated subsidiary	1,317
Net proceeds from sale of Candelaria and Ojos del Salado	0
Net proceeds from sale of Eagle Ford shale assets	0
Dividends from consolidated subsidiary			(629)
Other, net	0		0
Net cash used in investing activities	1,941		(1,301)
Cash flow from financing activities:
Proceeds from Debt	0		0
Repayments of Debt and redemption of MMR preferred stock	0		0
Intercompany loans	(624)		672
Cash dividends and distributions paid, and contributions received	(1,325)		629
Other, net	0		0
Net cash (used in) provided by financing activities	(1,949)		1,301
Net decrease in cash and cash equivalents	0		0
Cash and cash equivalents at beginning of year	0		0
Cash and cash equivalents at end of year	$ 0		$ 0

[1] Includes a tax charge of $57 million ($0.06 per share) in the second quarter, $5 million in the third quarter, $22 million ($0.02 per share) in the fourth quarter and $84 million ($0.08 per share) for the year associated with deferred taxes recorded in connection with the allocation of goodwill to the sale of the Eagle Ford properties. Additionally, includes a net tax charge (benefit) of $54 million ($7 million attributable to noncontrolling interests and $47 million to net income attributable to common stockholders or $0.04 per share) in the third quarter, $(17) million ($11 million attributable to noncontrolling interests and $(28) million to net loss attributable to common stockholders or $(0.03) per share) in the fourth quarter and $37 million ($18 million attributable to noncontrolling interests and $19 million to net loss attributable to common stockholders or $0.02 per share) for the year associated with changes in Chilean tax rules, U.S. federal income tax regulations and Peruvian tax rules, partially offset by a tax benefit related to changes in U.S. state income tax filing positions.

[2] Includes net gains (losses) on early extinguishment of debt totaling $4 million in the second quarter, $17 million ($0.02 per share) in the third quarter, $(18) million ($(0.02) per share) in the fourth quarter and $3 million for the year. Refer to Note 8 for further discussion.

[3] Includes a net tax benefit of $183 million ($0.19 per share) in the second quarter, $16 million ($0.01 per share) in the fourth quarter and $199 million ($0.20 per share) for the year associated with net reductions in FCX's deferred tax liabilities and deferred tax asset valuation allowances related to the acquisitions of PXP and MMR.