Financial Instruments (Unaudited) Oil and Gas (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended							3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Derivatives not designated as hedging instruments [Member] Natural gas swaps [Member] MMBTU	Mar. 31, 2014 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 5 MBbls [Member] Put Option [Member] MBbls		Mar. 31, 2014 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 30 MBbls [Member] Put Option [Member] MBbls		Mar. 31, 2014 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 75 MBbls [Member] Put Option [Member] MBbls		Mar. 31, 2014 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Natural gas swaps [Member] MMBTU	Mar. 31, 2014 2015 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 84 MBbls [Member] Put Option [Member] MBbls		Mar. 31, 2014 Deferred Option Premiums and Accrued Interest [Member]	Dec. 31, 2013 Deferred Option Premiums and Accrued Interest [Member]	Mar. 31, 2014 Weighted Average [Member] Crude Oil Options [Member]	Mar. 31, 2014 Weighted Average [Member] 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 5 MBbls [Member] Put Option [Member]		Mar. 31, 2014 Weighted Average [Member] 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 30 MBbls [Member] Put Option [Member]		Mar. 31, 2014 Weighted Average [Member] 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 75 MBbls [Member] Put Option [Member]		Mar. 31, 2014 Weighted Average [Member] 2015 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 84 MBbls [Member] Put Option [Member]
Derivative [Line Items]
Derivative Liability	$ 401	$ 320											$ 387	$ 444
Daily Volumes (Bbls)			28,000,000	75	[1]	30	[1]	5	[1]	100,000	84	[1]
Derivative, Average Floor Price				90	[1],[2]	95	[1],[2]	100	[1],[2]		90	[1],[2]
Derivative, Average Floor Price Limit				70	[1],[2]	75	[1],[2]	80	[1],[2]		70	[1],[2]
Deferred Premium Price															6.40	5.74	[1]	6.09	[1]	7.11	[1]	6.89	[1]
Derivative, Underlying Basis				Brent	[1]	Brent	[1]	Brent	[1]		Brent	[1]
Derivative Latest Maturity Period										December 2014
Maximum Price Limit per Barrel	20
Derivative, Swap Type, Fixed Price										4.09

[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.