Guarantor Financial Statements (Unaudited) Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
ASSETS
Current Assets, other than assets held for sale		$ 6,034	$ 6,718
Current assets held for sale		4,666	744
Property, plant, equipment and mining development costs, net		23,609	24,248
Oil and gas properties, net - full cost method
Subject to amortization, less accumulated amortization and impairment		1,381	2,262
Not subject to amortization		1,656	4,831
Investments in consolidated subsidiaries		0	0
Other assets		3,950	3,664
Assets held for sale		0	4,110
Total assets		41,296	46,577	$ 54,008
LIABILITIES AND EQUITY
Current Liabilities, other than liabilities held for sale		3,716	4,199
Current liabilities held for sale		824	108
Long-term debt, less current portion		18,549	19,779
Deferred income taxes		3,758	3,607
Environmental and asset retirement obligations, less current portion		3,697	3,717
Investments in consolidated subsidiaries		0	0
Other liabilities		1,662	1,641
Liabilities held for sale		0	718
Total liabilities		32,206	33,769
Redeemable noncontrolling interest		771	764
Equity:
Stockholders' equity		4,003	7,828
Noncontrolling interests		4,316	4,216
Total equity		8,319	12,044
Total liabilities and equity		41,296	46,577
FCX Issuer [Member]
ASSETS
Current Assets, other than assets held for sale		267	181
Current assets held for sale		0	0
Property, plant, equipment and mining development costs, net		23	26
Oil and gas properties, net - full cost method
Subject to amortization, less accumulated amortization and impairment		0	0
Not subject to amortization		0	0
Investments in consolidated subsidiaries		19,759	24,311
Other assets		1,389	5,038
Assets held for sale			0
Total assets		21,438	29,556
LIABILITIES AND EQUITY
Current Liabilities, other than liabilities held for sale		2,811	6,012
Current liabilities held for sale		0	0
Long-term debt, less current portion		13,520	14,735
Deferred income taxes	[1]	1,064	941
Environmental and asset retirement obligations, less current portion		0	0
Investments in consolidated subsidiaries		0	0
Other liabilities		40	40
Liabilities held for sale			0
Total liabilities		17,435	21,728
Redeemable noncontrolling interest		0	0
Equity:
Stockholders' equity		4,003	7,828
Noncontrolling interests		0	0
Total equity		4,003	7,828
Total liabilities and equity		21,438	29,556
FM O&G LLC Guarantor [Member]
ASSETS
Current Assets, other than assets held for sale		2,792	3,831
Current assets held for sale		0	0
Property, plant, equipment and mining development costs, net		57	57
Oil and gas properties, net - full cost method
Subject to amortization, less accumulated amortization and impairment		356	710
Not subject to amortization		408	1,393
Investments in consolidated subsidiaries		0	0
Other assets		42	1,826
Assets held for sale			0
Total assets		3,655	7,817
LIABILITIES AND EQUITY
Current Liabilities, other than liabilities held for sale		534	666
Current liabilities held for sale		0	0
Long-term debt, less current portion		7,425	5,883
Deferred income taxes		0	0
Environmental and asset retirement obligations, less current portion		313	305
Investments in consolidated subsidiaries		649	0
Other liabilities		3,381	3,360
Liabilities held for sale			0
Total liabilities		12,302	10,214
Redeemable noncontrolling interest		0	0
Equity:
Stockholders' equity		(8,647)	(2,397)
Noncontrolling interests		0	0
Total equity		(8,647)	(2,397)
Total liabilities and equity		3,655	7,817
Non-Guarantor Subsidiaries [Member]
ASSETS
Current Assets, other than assets held for sale		6,902	10,238
Current assets held for sale		4,666	744
Property, plant, equipment and mining development costs, net		23,529	24,165
Oil and gas properties, net - full cost method
Subject to amortization, less accumulated amortization and impairment		1,025	1,552
Not subject to amortization		1,246	3,432
Investments in consolidated subsidiaries		0	0
Other assets		3,866	3,598
Assets held for sale			4,110
Total assets		41,234	47,839
LIABILITIES AND EQUITY
Current Liabilities, other than liabilities held for sale		4,288	5,047
Current liabilities held for sale		824	108
Long-term debt, less current portion		12,064	11,594
Deferred income taxes		2,694	2,666
Environmental and asset retirement obligations, less current portion		3,384	3,412
Investments in consolidated subsidiaries		8,647	2,397
Other liabilities		1,730	1,732
Liabilities held for sale			718
Total liabilities		33,631	27,674
Redeemable noncontrolling interest		771	764
Equity:
Stockholders' equity		3,067	15,725
Noncontrolling interests		3,765	3,676
Total equity		6,832	19,401
Total liabilities and equity		41,234	47,839
Consolidation, Eliminations [Member]
ASSETS
Current Assets, other than assets held for sale		(3,927)	(7,532)
Current assets held for sale		0	0
Property, plant, equipment and mining development costs, net		0	0
Oil and gas properties, net - full cost method
Subject to amortization, less accumulated amortization and impairment		0	0
Not subject to amortization		2	6
Investments in consolidated subsidiaries		(19,759)	(24,311)
Other assets		(1,347)	(6,798)
Assets held for sale			0
Total assets		(25,031)	(38,635)
LIABILITIES AND EQUITY
Current Liabilities, other than liabilities held for sale		(3,917)	(7,526)
Current liabilities held for sale		0	0
Long-term debt, less current portion		(14,460)	(12,433)
Deferred income taxes		0	0
Environmental and asset retirement obligations, less current portion		0	0
Investments in consolidated subsidiaries		(9,296)	(2,397)
Other liabilities		(3,489)	(3,491)
Liabilities held for sale			0
Total liabilities		(31,162)	(25,847)
Redeemable noncontrolling interest		0	0
Equity:
Stockholders' equity		5,580	(13,328)
Noncontrolling interests		551	540
Total equity		6,131	(12,788)
Total liabilities and equity		$ (25,031)	$ (38,635)

[1] All U.S. related deferred income taxes are recorded at the parent company.