SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Details) (USD $)	7 Months Ended	12 Months Ended										12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2013 Haynesville [Member]	Dec. 31, 2013 Eagle Ford [Member]	Dec. 31, 2013 California [Member]	Dec. 31, 2013 Gulf of Mexico [Member]	Dec. 31, 2013 Oil and Gas Operations Segment [Member]		Feb. 14, 2014 Natural Gas [Member]	Dec. 31, 2013 Natural Gas [Member]	Feb. 14, 2014 Crude Oil [Member]	Dec. 31, 2013 Crude Oil [Member]	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]
Oil and Gas In Process Activities [Line Items]
Asset Retirement Costs												$ 1,100,000,000
Asset Retirement Costs, Liabilities Assumed				0	[1]	0	[1]					1,028,000,000	[1]
General and Administrative Costs Capitalized												67,000,000
Interest Costs Capitalized												$ 69,000,000
Average Depletion Depreciation and Amortization Expense Per Unit of Production	35.54
Costs Not Subject to Amortization to be Transferred, Percentage	61.00%	61.00%	61.00%
Majority of Costs Not Subject to Amortization to be Transferred, Period		5 years	5 years
Remainder of Costs Not Subject to Amortization to be Transferred, Period																		7 years	10 years
Net Undeveloped Acreage Covered by Expiring Leases, Percentage	41.00%	41.00%	41.00%
Acreage Held by Production, Percentage								90.00%	70.00%
Average Sales Prices														3.89	3.67	97.46	96.94
Total Reserve Volumes Subject to Reference Price Differential Quality Adjustments, Percentage										40.00%	25.00%
Fair Value Inputs, Discount Rate		10.00%	10.00%
Realized Sales Prices Used in Reserve Reports		3.64	99.67

[1] The fair value of AROs assumed in the acquisitions of PXP and MMR ($741 million and $287 million, respectively) were estimated based on projected cash flows, an estimated long-term annual inflation rate of 2.5 percent, and discount rates based on FCX's estimated credit-adjusted, risk-free interest rates ranging from 1.3 percent to 6.3 percent.