Guarantor Financial Statements (Unaudited) Condensed Consolidating Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 1,342		$ 1,985		$ 9,595	$ 3,705
Accounts receivable	2,377		2,562
Other current assets	5,711		5,425
Total current assets	9,430		9,972
Property, plant, equipment and mining development costs, net	24,729		24,042
Oil and gas properties - full cost method
Subject to amortization, less accumulated amortization	12,562		12,472
Not subject to amortization	10,775		10,887
Investments in consolidated subsidiaries	0		0
Goodwill	1,916		1,916
Other assets	4,431		4,184
Total assets	63,843		63,473		42,588
LIABILITIES AND EQUITY
Current liabilities	5,383		4,773
Long-term debt, less current portion	19,759		20,394
Deferred income taxes	7,504		7,410
Environmental and asset retirement obligations, less current portion	3,276		3,259
Other liabilities	1,695		1,690
Total liabilities	37,617		37,526
Redeemable noncontrolling interest	743		716
Equity:
Stockholders' equity	21,150		20,934
Noncontrolling interests	4,333		4,297
Total equity	25,483		25,231
Total liabilities and equity	63,843		63,473
FCX Issuer [Member]
Current assets:
Cash and cash equivalents	0		0
Accounts receivable	22		855
Other current assets	102		114
Total current assets	124		969
Property, plant, equipment and mining development costs, net	26		27
Oil and gas properties - full cost method
Subject to amortization, less accumulated amortization	0		0
Not subject to amortization	0		0
Investments in consolidated subsidiaries	31,628		31,162
Goodwill	0		0
Other assets	7,478		7,126
Total assets	39,256		39,284
LIABILITIES AND EQUITY
Current liabilities	1,244		1,003
Long-term debt, less current portion	12,585		13,184
Deferred income taxes	4,246	[1]	4,137	[1]
Environmental and asset retirement obligations, less current portion	0		0
Other liabilities	31		26
Total liabilities	18,106		18,350
Redeemable noncontrolling interest	0		0
Equity:
Stockholders' equity	21,150		20,934
Noncontrolling interests	0		0
Total equity	21,150		20,934
Total liabilities and equity	39,256		39,284
FM O&G LLC Guarantor [Member]
Current assets:
Cash and cash equivalents	2		0
Accounts receivable	324		659
Other current assets	107		38
Total current assets	433		697
Property, plant, equipment and mining development costs, net	45		43
Oil and gas properties - full cost method
Subject to amortization, less accumulated amortization	6,331		6,207
Not subject to amortization	2,524		2,649
Investments in consolidated subsidiaries	9,939		9,712
Goodwill	437		437
Other assets	4,687		4,640
Total assets	24,396		24,385
LIABILITIES AND EQUITY
Current liabilities	879		758
Long-term debt, less current portion	6,967		7,199
Deferred income taxes	0		0
Environmental and asset retirement obligations, less current portion	305		301
Other liabilities	3,409		3,436
Total liabilities	11,560		11,694
Redeemable noncontrolling interest	0		0
Equity:
Stockholders' equity	12,836		12,691
Noncontrolling interests	0		0
Total equity	12,836		12,691
Total liabilities and equity	24,396		24,385
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	1,340		1,985
Accounts receivable	2,088		2,258
Other current assets	5,502		5,273
Total current assets	8,930		9,516
Property, plant, equipment and mining development costs, net	24,658		23,972
Oil and gas properties - full cost method
Subject to amortization, less accumulated amortization	6,223		6,265
Not subject to amortization	8,251		8,238
Investments in consolidated subsidiaries	12,680		12,468
Goodwill	1,479		1,479
Other assets	4,293		4,128
Total assets	66,514		66,066
LIABILITIES AND EQUITY
Current liabilities	3,317		4,222
Long-term debt, less current portion	8,809		8,056
Deferred income taxes	3,258		3,273
Environmental and asset retirement obligations, less current portion	2,971		2,958
Other liabilities	1,680		1,893
Total liabilities	20,035		20,402
Redeemable noncontrolling interest	743		716
Equity:
Stockholders' equity	41,864		41,100
Noncontrolling interests	3,872		3,848
Total equity	45,736		44,948
Total liabilities and equity	66,514		66,066
Eliminations [Member]
Current assets:
Cash and cash equivalents	0		0
Accounts receivable	(57)		(1,210)
Other current assets	0		0
Total current assets	(57)		(1,210)
Property, plant, equipment and mining development costs, net	0		0
Oil and gas properties - full cost method
Subject to amortization, less accumulated amortization	8		0
Not subject to amortization	0		0
Investments in consolidated subsidiaries	(54,247)		(53,342)
Goodwill	0		0
Other assets	(12,027)		(11,710)
Total assets	(66,323)		(66,262)
LIABILITIES AND EQUITY
Current liabilities	(57)		(1,210)
Long-term debt, less current portion	(8,602)		(8,045)
Deferred income taxes	0		0
Environmental and asset retirement obligations, less current portion	0		0
Other liabilities	(3,425)		(3,665)
Total liabilities	(12,084)		(12,920)
Redeemable noncontrolling interest	0		0
Equity:
Stockholders' equity	(54,700)		(53,791)
Noncontrolling interests	461		449
Total equity	(54,239)		(53,342)
Total liabilities and equity	$ (66,323)		$ (66,262)

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