FINANCIAL INSTRUMENTS (Oil and Gas) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 MBbls		Dec. 31, 2013
Derivative [Line Items]
Derivative Liability	$ 99		$ 320
Maximum Price Limit per Barrel	20
Deferred Option Premiums and Accrued Interest [Member]
Derivative [Line Items]
Derivative Liability	$ 210		$ 444
Crude Oil Options [Member] | 2014 Positions [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	31,000,000
Crude Oil Options [Member] | 2015 Positions [Member] | Derivatives Not Designated as Hedging Instruments [Member] | 84 MBbls [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	84	[1]
Derivative, Average Floor Price	90	[1],[2]
Derivative, Average Floor Price Limit	70	[1],[2]
Derivative, Underlying Basis	Brent
Weighted Average [Member] | Crude Oil Options [Member]
Derivative [Line Items]
Deferred Premium Price	6.89
Weighted Average [Member] | Crude Oil Options [Member] | 2015 Positions [Member] | Derivatives Not Designated as Hedging Instruments [Member] | 84 MBbls [Member]
Derivative [Line Items]
Deferred Premium Price	6.89	[1]

[1] If the index price is less than the per barrel floor, FCX receives the difference between the per barrel floor and the index price up to a maximum of $20 per barrel less the option premium. If the index price is at or above the per barrel floor, FCX pays the option premium and no cash settlement is received.

[2] The average strike prices do not reflect any premiums to purchase the put options.