Income Taxes (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Income Tax Disclosure [Abstract]
U.S. operations	$ 149	[1]	$ (95)	[2]	$ 285	[1]	$ (19)	[2]
International operations	179		135		400		487
Total	328		40		685		468
Income Tax Expense (Benefit), Changes in Deferred Tax Liabilities and Deferred Tax Asset Valuation Allowances	58		(183)		58		(183)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount			(190)				(190)
Deferred Other Tax Expense (Benefit)			(69)				(69)
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			$ 76				$ 76
Consolidated effective income tax rate (percent)					35.00%		34.00%

[1] FCX recognized a $58 million charge for deferred taxes recorded in connection with the allocation of goodwill to the sale of Eagle Ford.

[2] As a result of second-quarter 2013 oil and gas acquisitions, FCX recognized a net tax benefit of $183 million, consisting of income tax benefits of $190 million associated with net reductions in FCX's valuation allowances and $69 million related to the release of the deferred tax liability on PXP's investment in MMR common stock; partially offset by income tax expense of $76 million associated with the write off of deferred tax assets related to environmental liabilities.