ACQUISITIONS (Purchase Price Allocation) (Details) (USD $) In Millions, unless otherwise specified	7 Months Ended		12 Months Ended				7 Months Ended			7 Months Ended
	Dec. 31, 2013		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Plains Exploration & Production Company [Member]		May 31, 2013 Plains Exploration & Production Company [Member]	Dec. 31, 2013 McMoRan Exploration Co [Member]		Jun. 03, 2013 McMoRan Exploration Co [Member]	May 31, 2013 McMoRan Exploration Co [Member]	Dec. 31, 2013 Intersubsegment Eliminations [Member]
Business Acquisition [Line Items]
Investment Owned, Balance, Shares													51
Current assets	$ 1,291		$ 1,291				$ 1,193			$ 98				$ 0
Subject to amortization	12,203		12,203				11,447			756				0
Not subject to amortization	11,087		11,087				9,401			1,686				0
Property, plant, and equipment	262		262				261			1				0
Investment in MMR	0	[1]	0	[1]			848	[1]		0	[1]		848	(848)	[1]
Other assets	435		435				12			423				0
Current liabilities	(1,080)		(1,080)				(906)			(174)				0
Debt (current and long-term)	(11,251)		(11,251)				(10,631)			(620)				0
Deferred income taxes	(3,916)	[2]	(3,916)	[2]			(3,916)	[2]		0	[2]			0	[2]
Other long-term liabilities	(1,061)		(1,061)				(799)			(262)				0
Redeemable noncontrolling interest	(967)		(967)				(708)			(259)				0
Total fair value, excluding goodwill	7,003		7,003				6,202			1,649				(848)
Goodwill	1,916	[3]	1,916	[3]	0		437	[3]		1,479	[3]			0	[3]
Total purchase price	8,919		8,919				6,639		6,639	3,128		3,128		(848)
Business Combinations, Tax Rate, Fair Value Adjustments, Percent	38.00%
Federal Statutory Income Tax Rate, Percent	35.00%		35.00%		35.00%	35.00%
State and Local Income Taxes, Percent	3.00%		0.00%		0.00%	0.00%
Increase in current assets (primarily current deferred income tax asset)	185						183			2
Subject to amortization	(45)						0			(45)
Not subject to amortization	(240)						(234)			(6)
Increase in other assets (deferred income tax asset)	24						0			24
Net increase in deferred income tax liability	(45)						(45)			0
Net decrease (increase) in other liabilities (primarily warrants)	73						77			(4)
Decrease n redeemable noncontrolling interest	41						41			0
(Decrease) increase in goodwill	$ 12						$ (17)			$ 29

[1] PXP owned 51 million shares of MMR common stock, which was eliminated in FCX's consolidated balance sheet at the acquisition date of MMR.

[2] Deferred income taxes have been recognized based on the estimated fair value adjustments to net assets using a 38 percent tax rate, which reflected the 35 percent federal statutory rate and a 3 percent weighted-average of the applicable statutory state tax rates (net of federal benefit).

[3] During the fourth quarter of 2013, FCX conducted a qualitative goodwill impairment assessment by examining relevant events and circumstances that could have a negative impact on FCX's goodwill, such as macroeconomic conditions, industry and market conditions, cost factors that have a negative effect on earnings and cash flows, overall financial performance, dispositions and acquisitions, and any other relevant events or circumstances. After assessing the relevant events and circumstances for the qualitative impairment assessment, FCX determined that performing a quantitative goodwill impairment test was unnecessary, and no goodwill impairment was recognized.