Guarantor Financial Statements (Unaudited) Condensed Consolidating Statements of Income (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2015		Sep. 30, 2014
Document Period End Date					Sep. 30, 2015
Revenues	$ 3,681		$ 5,696		$ 12,082		$ 16,203
Total costs and expenses	7,626		4,564		21,364		12,807
Operating (loss) income	(3,945)		1,132		(9,282)		3,396
Interest expense, net	(163)		(158)		(458)		(483)
Net gain on early extinguishment of debt	0		58		0		63
Other income (expense), net	(40)		23		4		48
(Loss) income before income taxes and equity in affiliated companies' net losses	(4,148)		1,055		(9,736)		3,024
Benefit from (provision for) income taxes	360		(349)		1,742		(1,034)
Equity in affiliated companies' net (losses) earnings	(2)		(2)		(1)		0
Net (loss) income	(3,790)		704		(7,995)		1,990
Net income and preferred dividends attributable to noncontrolling interests	(40)		(152)		(160)		(446)
Net (loss) income attributable to common stockholders	(3,830)		552		(8,155)		1,544
Other comprehensive income (loss)	14		7		35		11
Total comprehensive (loss) income	(3,816)		559		(8,120)		1,555
Impairment of oil and gas properties	3,652		308		9,442		308
FCX Issuer [Member]
Revenues	0		0		0		0
Total costs and expenses	12		12		47		44
Operating (loss) income	(12)		(12)		(47)		(44)
Interest expense, net	(123)		(99)		(359)		(268)
Net gain on early extinguishment of debt			0				(1)
Other income (expense), net	31		15		187		52
(Loss) income before income taxes and equity in affiliated companies' net losses	(104)		(96)		(219)		(261)
Benefit from (provision for) income taxes	(1,283)		46		(1,969)		51
Equity in affiliated companies' net (losses) earnings	(2,443)		602		(5,967)		1,754
Net (loss) income	(3,830)		552		(8,155)		1,544
Net income and preferred dividends attributable to noncontrolling interests	0		0		0		0
Net (loss) income attributable to common stockholders	(3,830)		552		(8,155)		1,544
Other comprehensive income (loss)	14		7		35		11
Total comprehensive (loss) income	(3,816)		559		(8,120)		1,555
Impairment of oil and gas properties					0		0
FM O&G LLC Guarantor [Member]
Revenues	158		370		508		1,584
Total costs and expenses	1,874	[1]	916	[2]	4,409	[3]	1,931	[4]
Operating (loss) income	(1,716)		(546)		(3,901)		(347)
Interest expense, net	(1)		(38)		(7)		(123)
Net gain on early extinguishment of debt			58				64
Other income (expense), net	0		0		0		1
(Loss) income before income taxes and equity in affiliated companies' net losses	(1,717)		(526)		(3,908)		(405)
Benefit from (provision for) income taxes	714		(104)		1,504		(121)
Equity in affiliated companies' net (losses) earnings	(2,237)		381		(6,516)		637
Net (loss) income	(3,240)		(249)		(8,920)		111
Net income and preferred dividends attributable to noncontrolling interests	0		0		0		0
Net (loss) income attributable to common stockholders	(3,240)		(249)		(8,920)		111
Other comprehensive income (loss)	0		0		0		0
Total comprehensive (loss) income	(3,240)		(249)		(8,920)		111
Impairment of oil and gas properties	1,658		625		3,710		625
Non-Guarantor Subsidiaries [Member]
Revenues	3,523		5,326		11,574		14,619
Total costs and expenses	5,742	[1]	3,966		16,923	[3]	11,170
Operating (loss) income	(2,219)		1,360		(5,349)		3,449
Interest expense, net	(78)		(37)		(202)		(146)
Net gain on early extinguishment of debt			0				0
Other income (expense), net	(35)		24		(83)		49
(Loss) income before income taxes and equity in affiliated companies' net losses	(2,332)		1,347		(5,634)		3,352
Benefit from (provision for) income taxes	931		(166)		2,217		(836)
Equity in affiliated companies' net (losses) earnings	(2,445)		(111)		(8,947)		228
Net (loss) income	(3,846)		1,070		(12,364)		2,744
Net income and preferred dividends attributable to noncontrolling interests	(39)		(130)		(133)		(421)
Net (loss) income attributable to common stockholders	(3,885)		940		(12,497)		2,323
Other comprehensive income (loss)	14		7		35		11
Total comprehensive (loss) income	(3,871)		947		(12,462)		2,334
Impairment of oil and gas properties	1,967				5,684		0
Eliminations [Member]
Revenues	0		0		0		0
Total costs and expenses	(2)		(330)	[2]	(15)		(338)	[4]
Operating (loss) income	2		330		15		338
Interest expense, net	39		16		110		54
Net gain on early extinguishment of debt			0				0
Other income (expense), net	(36)		(16)		(100)		(54)
(Loss) income before income taxes and equity in affiliated companies' net losses	5		330		25		338
Benefit from (provision for) income taxes	(2)		(125)		(10)		(128)
Equity in affiliated companies' net (losses) earnings	7,123		(874)		21,429		(2,619)
Net (loss) income	7,126		(669)		21,444		(2,409)
Net income and preferred dividends attributable to noncontrolling interests	(1)		(22)		(27)		(25)
Net (loss) income attributable to common stockholders	7,125		(691)		21,417		(2,434)
Other comprehensive income (loss)	(14)		(7)		(35)		(11)
Total comprehensive (loss) income	$ 7,111		(698)		21,382		(2,445)
Impairment of oil and gas properties			$ (317)		$ 48		$ (317)

[1] Includes charges totaling $1.7 billion at the FM O&G LLC guarantor and $2.0 billion at the non-guarantor subsidiaries related to impairment of FCX's oil and gas properties pursuant to full cost accounting rules.

[2] Includes charges totaling $0.6 billion at the FM O&G LLC guarantor and $(0.3) billion of eliminations related to impairment of FCX's oil and gas properties pursuant to full cost accounting rules.

[3] Includes charges totaling $3.7 billion at the FM O&G LLC guarantor and $5.7 billion at the non-guarantor subsidiaries related to impairment of FCX's oil and gas properties pursuant to full cost accounting rules.

[4] Includes charges totaling $0.6 billion at the FM O&G LLC guarantor and $(0.3) billion of eliminations related to impairment of FCX's oil and gas properties pursuant to full cost accounting rules.