Guarantor Financial Statements (Unaudited) Condensed Consolidating Statements of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flow from operating activities:
Net income	$ 1,286	$ 1,434
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation, depletion and amortization	1,979	859
Net losses on crude oil and natural gas derivative contracts	120	35
Gains (Losses) on Extinguishment of Debt	(5)	45
Gain on investment in McMoRan Exploration Co. (MMR)	0	(128)
Equity in (earnings) losses of consolidated subsidiaries	(2)	(4)
Other, net	(14)	(181)
Increase (Decrease) in Operating Capital	(777)	(195)
Net cash provided by operating activities	2,587	1,865
Cash flow from investing activities:
Capital expenditures	(3,562)	(1,978)
Acquisitions	(925)	(5,414)
Intercompany loans	0
Investment in consolidated subsidiary	0	0
Net proceeds from sale of Eagle Ford shale assets	3,009	0
Other, net	(363)	(264)
Net cash used in investing activities	(1,841)	(7,656)
Cash flow from financing activities:
Proceeds from debt	1,248	11,021
Repayments of debt	(1,611)	(4,541)
Intercompany loans	0	0
Cash dividends and distributions paid	(903)	(685)
Other, net	(7)	(415)
Net cash (used in) provided by financing activities	(1,273)	5,380
Net decrease in cash and cash equivalents	(527)	(411)
Cash and cash equivalents at beginning of year	1,985	3,705
Cash and cash equivalents at end of period	1,458	3,294
FCX Issuer [Member]
Cash flow from operating activities:
Net income	992	1,130
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation, depletion and amortization	2	2
Net losses on crude oil and natural gas derivative contracts	0	0
Gains (Losses) on Extinguishment of Debt	1	45
Gain on investment in McMoRan Exploration Co. (MMR)		(128)
Equity in (earnings) losses of consolidated subsidiaries	(1,152)	(1,229)
Other, net	121	27
Increase (Decrease) in Operating Capital	(164)	142
Net cash provided by operating activities	(200)	(11)
Cash flow from investing activities:
Capital expenditures	0	0
Acquisitions	0	(5,437)
Intercompany loans	1,318
Investment in consolidated subsidiary	(364)	104
Net proceeds from sale of Eagle Ford shale assets	0
Other, net	0	(5)
Net cash used in investing activities	954	(5,338)
Cash flow from financing activities:
Proceeds from debt	890	10,885
Repayments of debt	(990)	(4,050)
Intercompany loans	0	(476)
Cash dividends and distributions paid	(653)	(595)
Other, net	(1)	(415)
Net cash (used in) provided by financing activities	(754)	5,349
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 period	0	0
FM O&G LLC Guarantor [Member]
Cash flow from operating activities:
Net income	360	30
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation, depletion and amortization	545	79
Net losses on crude oil and natural gas derivative contracts	120	35
Gains (Losses) on Extinguishment of Debt	(6)	0
Gain on investment in McMoRan Exploration Co. (MMR)		0
Equity in (earnings) losses of consolidated subsidiaries	(256)	(20)
Other, net	(12)	(6)
Increase (Decrease) in Operating Capital	(2,165)	31
Net cash provided by operating activities	(1,414)	149
Cash flow from investing activities:
Capital expenditures	(897)	(151)
Acquisitions	0	0
Intercompany loans	1,629
Investment in consolidated subsidiary	(96)	0
Net proceeds from sale of Eagle Ford shale assets	3,009
Other, net	(381)	0
Net cash used in investing activities	3,264	(151)
Cash flow from financing activities:
Proceeds from debt	0	0
Repayments of debt	(224)	(415)
Intercompany loans	(170)	476
Cash dividends and distributions paid	(1,453)	0
Other, net	(2)	0
Net cash (used in) provided by financing activities	(1,849)	61
Net decrease in cash and cash equivalents	1	59
Cash and cash equivalents at beginning of year	0	0
Cash and cash equivalents at end of period	1	59
Non-Guarantor Subsidiaries [Member]
Cash flow from operating activities:
Net income	1,674	1,473
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation, depletion and amortization	1,440	772
Net losses on crude oil and natural gas derivative contracts	0	0
Gains (Losses) on Extinguishment of Debt	0	0
Gain on investment in McMoRan Exploration Co. (MMR)		0
Equity in (earnings) losses of consolidated subsidiaries	39	52
Other, net	(123)	(202)
Increase (Decrease) in Operating Capital	1,552	(368)
Net cash provided by operating activities	4,582	1,727
Cash flow from investing activities:
Capital expenditures	(2,665)	(1,827)
Acquisitions	(925)	(321)
Intercompany loans	0
Investment in consolidated subsidiary	1,079	0
Net proceeds from sale of Eagle Ford shale assets	0
Other, net	18	(259)
Net cash used in investing activities	(2,493)	(2,407)
Cash flow from financing activities:
Proceeds from debt	358	136
Repayments of debt	(397)	(76)
Intercompany loans	(2,777)	344
Cash dividends and distributions paid	203	(194)
Other, net	(4)	0
Net cash (used in) provided by financing activities	(2,617)	210
Net decrease in cash and cash equivalents	(528)	(470)
Cash and cash equivalents at beginning of year	1,985	3,705
Cash and cash equivalents at end of period	1,457	3,235
Eliminations [Member]
Cash flow from operating activities:
Net income	(1,740)	(1,199)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation, depletion and amortization	(8)	6
Net losses on crude oil and natural gas derivative contracts	0	0
Gains (Losses) on Extinguishment of Debt	0	0
Gain on investment in McMoRan Exploration Co. (MMR)		0
Equity in (earnings) losses of consolidated subsidiaries	1,367	1,193
Other, net	0	0
Increase (Decrease) in Operating Capital	0	0
Net cash provided by operating activities	(381)	0
Cash flow from investing activities:
Capital expenditures	0	0
Acquisitions	0	344
Intercompany loans	(2,947)
Investment in consolidated subsidiary	(619)	(104)
Net proceeds from sale of Eagle Ford shale assets	0
Other, net	0	0
Net cash used in investing activities	(3,566)	240
Cash flow from financing activities:
Proceeds from debt	0	0
Repayments of debt	0	0
Intercompany loans	2,947	(344)
Cash dividends and distributions paid	1,000	104
Other, net	0	0
Net cash (used in) provided by financing activities	3,947	(240)
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 period	$ 0	$ 0