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FINANCIAL INSTRUMENTS (Unrealized gains losses) (Details) oz in Thousands, lb in Millions, $ in Millions		12 Months Ended
	Dec. 31, 2018 lb oz $ / lb $ / lb $ / oz	Dec. 31, 2018 USD ($) $ / lb $ / lb $ / oz	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Derivatives Not Designated as Hedging Instruments | Amounts recorded in Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $		$ (317)	$ 515	$ 266
Commodity Contract [Member]
Unrealized gains (losses):
Derivative financial instruments | $		(20)	4	16
Hedged item – firm sales commitments | $		20	(4)	(16)
Realized gains (losses):
Matured derivative financial instruments | $		$ (22)	30	1
Commodity Contract [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	68
Derivative, Average Forward Price | $ / lb	2.77	2.77
Crude Oil Options [Member] | Derivatives Not Designated as Hedging Instruments | Freeport-McMoRan Oil & Gas | Amounts recorded in Sales [Member]
Realized gains (losses):
Matured derivative financial instruments | $		$ 0	0	(35)
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	8
Derivative, Average Forward Price | $ / lb	2.76	2.76
Copper Forward Contracts [Member] | Derivatives Not Designated as Hedging Instruments | Amounts recorded in Cost of Sales
Realized gains (losses):
Matured derivative financial instruments | $		$ 18	(15)	5
Copper | Derivatives Not Designated as Hedging Instruments | Amounts recorded in Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $		$ (310)	489	262
Copper | Short [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	489
Derivative, Average Forward Price | $ / lb	2.78	2.78
Realized gains (losses):
Derivative Average Market Price | $ / lb	2.70	2.70
Copper | Long [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	117
Derivative, Average Forward Price | $ / lb	2.79	2.79
Realized gains (losses):
Derivative Average Market Price | $ / lb	2.71	2.71
Gold | Short [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | oz	119
Derivative, Average Forward Price | $ / oz	1,229.00	1,229.00
Realized gains (losses):
Derivative Average Market Price | $ / oz	1,286.00	1,286.00
Cobalt | Long [Member] | Embedded Derivative Financial Instruments [Member] | Derivatives Not Designated as Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | lb	9
Derivative, Average Forward Price | $ / lb	19.58	19.58
Realized gains (losses):
Derivative Average Market Price | $ / lb	19.25	19.25
gold and other [Member] | Derivatives Not Designated as Hedging Instruments | Amounts recorded in Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $		$ (7)	$ 26	$ 4

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