GUARANTOR FINANCIAL STATEMENTS (Condensed Consolidating Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Jun. 30, 2014	Dec. 31, 2013		Jun. 03, 2013	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 464			$ 1,985			$ 3,705	$ 4,822
Accounts receivables	2,563			2,562
Other current assets	6,018			5,425
Total current assets	9,045			9,972
Property, plant, equipment and mining development costs, net	26,220			24,042
Oil and gas properties, net - full cost method:
Subject to amortization	9,187			12,472
Not subject to amortization	10,087			10,887
Investment in consolidated subsidiaries	0			0
Goodwill	0		1,938	1,916
Other Assets	4,256			4,184
Total assets	58,795			63,473			35,440
LIABILITIES AND EQUITY
Current liabilities	5,172			4,773
Long-term debt, less current portion	18,492			20,394
Deferred income taxes	6,398			7,410
Environmental and asset retirement obligations, less current portion	3,647			3,259
Other liabilities	1,861			1,690
Total liabilities	35,570			37,526
Redeemable noncontrolling interest	751			716		259
Equity:
Stockholders' equity	18,287			20,934
Noncontrolling interests	4,187			4,297
Total equity	22,474			25,231			21,311	18,553
Total liabilities and equity	58,795			63,473
FCX Issuer [Member]
Current assets:
Cash and cash equivalents	0			0			0
Accounts receivables	234			855
Other current assets	89			114
Total current assets	323			969
Property, plant, equipment and mining development costs, net	22			27
Oil and gas properties, net - full cost method:
Subject to amortization	0			0
Not subject to amortization	0			0
Investment in consolidated subsidiaries	28,765			31,162
Goodwill				0
Other Assets	9,012			7,126
Total assets	38,122			39,284
LIABILITIES AND EQUITY
Current liabilities	1,592			1,003
Long-term debt, less current portion	15,028			13,184
Deferred income taxes	3,161	[1]		4,137	[1]
Environmental and asset retirement obligations, less current portion	0			0
Other liabilities	54			26
Total liabilities	19,835			18,350
Redeemable noncontrolling interest	0			0
Equity:
Stockholders' equity	18,287			20,934
Noncontrolling interests	0			0
Total equity	18,287			20,934
Total liabilities and equity	38,122			39,284
FM O&G LLC Guarantor [Member]
Current assets:
Cash and cash equivalents	1			0			0
Accounts receivables	2,230			659
Other current assets	404			38
Total current assets	2,635			697
Property, plant, equipment and mining development costs, net	46			43
Oil and gas properties, net - full cost method:
Subject to amortization	3,296			6,207
Not subject to amortization	2,447			2,649
Investment in consolidated subsidiaries	6,460			9,712
Goodwill				437
Other Assets	3,947			4,640
Total assets	18,831			24,385
LIABILITIES AND EQUITY
Current liabilities	560			758
Long-term debt, less current portion	3,874			7,199
Deferred income taxes	0			0
Environmental and asset retirement obligations, less current portion	302			301
Other liabilities	3,372			3,436
Total liabilities	8,108			11,694
Redeemable noncontrolling interest	0			0
Equity:
Stockholders' equity	10,723			12,691
Noncontrolling interests	0			0
Total equity	10,723			12,691
Total liabilities and equity	18,831			24,385
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	463			1,985			3,705
Accounts receivables	2,671			2,258
Other current assets	5,525			5,273
Total current assets	8,659			9,516
Property, plant, equipment and mining development costs, net	26,152			23,972
Oil and gas properties, net - full cost method:
Subject to amortization	5,907			6,265
Not subject to amortization	7,640			8,238
Investment in consolidated subsidiaries	10,246			12,468
Goodwill				1,479
Other Assets	4,084			4,128
Total assets	62,688			66,066
LIABILITIES AND EQUITY
Current liabilities	5,592			4,222
Long-term debt, less current portion	8,902			8,056
Deferred income taxes	3,237			3,273
Environmental and asset retirement obligations, less current portion	3,345			2,958
Other liabilities	1,910			1,893
Total liabilities	22,986			20,402
Redeemable noncontrolling interest	751			716
Equity:
Stockholders' equity	35,268			41,100
Noncontrolling interests	3,683			3,848
Total equity	38,951			44,948
Total liabilities and equity	62,688			66,066
Eliminations [Member]
Current assets:
Cash and cash equivalents	0			0			0
Accounts receivables	(2,572)			(1,210)
Other current assets	0			0
Total current assets	(2,572)			(1,210)
Property, plant, equipment and mining development costs, net	0			0
Oil and gas properties, net - full cost method:
Subject to amortization	(16)			0
Not subject to amortization	0			0
Investment in consolidated subsidiaries	(45,471)			(53,342)
Goodwill				0
Other Assets	(12,787)			(11,710)
Total assets	(60,846)			(66,262)
LIABILITIES AND EQUITY
Current liabilities	(2,572)			(1,210)
Long-term debt, less current portion	(9,312)			(8,045)
Deferred income taxes	0			0
Environmental and asset retirement obligations, less current portion	0			0
Other liabilities	(3,475)			(3,665)
Total liabilities	(15,359)			(12,920)
Redeemable noncontrolling interest	0			0
Equity:
Stockholders' equity	(45,991)			(53,791)
Noncontrolling interests	504			449
Total equity	(45,487)			(53,342)
Total liabilities and equity	$ (60,846)			$ (66,262)

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