Guarantor Financial Statements (Unaudited) Condensed Consolidating Statements of Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Revenues	$ 4,153		$ 4,985
Total costs and expenses	7,116		3,874
Operating (loss) income	(2,963)		1,111
Interest expense, net	(146)		(161)
Other income (expense), net	7		33
(Loss) income before income taxes and equity in affiliated companies' net earnings	(3,102)		983
Benefit from (provision for) income taxes	695		(357)
Equity in affiliated companies' net (losses) earnings	1		0
Net (loss) income	(2,406)		626
Net income and preferred dividends attributable to noncontrolling interests	(68)		(116)
Net (loss) income attributable to common stockholders	(2,474)		510
Other comprehensive income (loss)	12		3
Total comprehensive (loss) income	(2,462)		513
Impairment of oil and gas properties	3,104		0
FCX Issuer [Member]
Revenues	0		0
Total costs and expenses	16		11
Operating (loss) income	(16)		(11)
Interest expense, net	(115)		(82)
Other income (expense), net	29		20
(Loss) income before income taxes and equity in affiliated companies' net earnings	(102)		(73)
Benefit from (provision for) income taxes	(421)		(21)
Equity in affiliated companies' net (losses) earnings	(1,951)		604
Net (loss) income	(2,474)		510
Net income and preferred dividends attributable to noncontrolling interests	0		0
Net (loss) income attributable to common stockholders	(2,474)		510
Other comprehensive income (loss)	12		3
Total comprehensive (loss) income	(2,462)		513
Impairment of oil and gas properties	0
FM O&G LLC Guarantor [Member]
Revenues	181		644
Total costs and expenses	1,318	[1]	526
Operating (loss) income	(1,137)		118
Interest expense, net	(4)		(41)
Other income (expense), net	0		0
(Loss) income before income taxes and equity in affiliated companies' net earnings	(1,141)		77
Benefit from (provision for) income taxes	1,157		(43)
Equity in affiliated companies' net (losses) earnings	(2,359)		130
Net (loss) income	(2,343)		164
Net income and preferred dividends attributable to noncontrolling interests	0		0
Net (loss) income attributable to common stockholders	(2,343)		164
Other comprehensive income (loss)	0		0
Total comprehensive (loss) income	(2,343)		164
Impairment of oil and gas properties	1,062
Non-Guarantor Subsidiaries [Member]
Revenues	3,972		4,341
Total costs and expenses	5,798	[1]	3,339
Operating (loss) income	(1,826)		1,002
Interest expense, net	(57)		(58)
Other income (expense), net	8		33
(Loss) income before income taxes and equity in affiliated companies' net earnings	(1,875)		977
Benefit from (provision for) income taxes	(35)		(292)
Equity in affiliated companies' net (losses) earnings	(3,530)		185
Net (loss) income	(5,440)		870
Net income and preferred dividends attributable to noncontrolling interests	(56)		(111)
Net (loss) income attributable to common stockholders	(5,496)		759
Other comprehensive income (loss)	12		3
Total comprehensive (loss) income	(5,484)		762
Impairment of oil and gas properties	2,042
Eliminations [Member]
Revenues	0		0
Total costs and expenses	(16)		(2)
Operating (loss) income	16		2
Interest expense, net	30		20
Other income (expense), net	(30)		(20)
(Loss) income before income taxes and equity in affiliated companies' net earnings	16		2
Benefit from (provision for) income taxes	(6)		(1)
Equity in affiliated companies' net (losses) earnings	7,841		(919)
Net (loss) income	7,851		(918)
Net income and preferred dividends attributable to noncontrolling interests	(12)		(5)
Net (loss) income attributable to common stockholders	7,839		(923)
Other comprehensive income (loss)	(12)		(3)
Total comprehensive (loss) income	7,827		(926)
Impairment of oil and gas properties	$ 0

[1] Includes impairment charges totaling $1.1 billion at the FM O&G LLC guarantor and $2.0 billion at the non-guarantor subsidiaries related to ceiling test impairment charges for FCX's oil and gas properties pursuant to full cost accounting rules.