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Subsequent Events (Unaudited)	9 Months Ended
Subsequent Events (Unaudited)	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS On October 14, 2016, FM O&G entered into an agreement to sell its onshore California oil and gas properties. Refer to Note 2 for further discussion. FCX evaluated events after September 30, 2016, and through the date the consolidated financial statements were issued, and determined any events or transactions occurring during this period that would require recognition or disclosure are appropriately addressed in these consolidated financial statements.