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DEBT - Schedule of Senior Notes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2020	Mar. 31, 2020	Aug. 15, 2019	Aug. 01, 2019
Debt Instruments [Line Items]
Gain (Loss) on Extinguishment of Debt	$ (101)	$ (27)	$ 7
Liabilities, Fair Value Adjustment	10	11
Long-term Debt	9,711	9,826
Debt Issuance Costs, Net	85	66
Senior Notes due 2027, 5% [Member]
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.375%			5.00%
Long-term Debt				$ 650
Senior Notes Due 2023 [Member]
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						3.875%
3.55% Senior Notes Due 2022 [Member]
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					3.55%		3.55%
Senior Notes due 2029, 5.25% [Member]
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.625%			5.25%
Long-term Debt				$ 850
Senior Notes [Member]
Debt Instruments [Line Items]
Extinguishment Of Debt, Redemption Value	2,686	2,201	470
Gain (Loss) on Extinguishment of Debt	100	26	(10)
Debt Instrument, Face Amount	2,598	2,145	454
Extinguishment of Debt, Amount	$ 2,586	2,175	480
Senior Notes [Member] | Senior Notes due 2027, 5% [Member]
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.00%
Long-term Debt	$ 593	$ 592
Senior Notes [Member] | 3.100% Senior Notes due March 2020
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.10%
Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member]
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.125%	6.125%
Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member]
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.50%	6.50%
Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member]
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.625%	6.625%
Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member]
Debt Instruments [Line Items]
Extinguishment Of Debt, Redemption Value			418
Gain (Loss) on Extinguishment of Debt			(8)
Debt Instrument, Interest Rate, Stated Percentage	6.75%	6.75%
Debt Instrument, Face Amount			404
Extinguishment of Debt, Amount			$ 426
Senior Notes [Member] | 3.55% Senior Notes Due 2022 [Member]
Debt Instruments [Line Items]
Extinguishment Of Debt, Redemption Value	$ 1,391	$ 12
Gain (Loss) on Extinguishment of Debt	$ 41	0
Debt Instrument, Interest Rate, Stated Percentage	3.55%
Debt Instrument, Face Amount	$ 1,356	12
Long-term Debt	523	1,876
Extinguishment of Debt, Amount	$ 1,350	12
Senior Notes [Member] | Senior Notes due 2029, 5.25% [Member]
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.25%
Long-term Debt	$ 593	$ 592
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member]
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.125%
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member]
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member]
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.625%
Freeport-McMoRan Oil & Gas | Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member]
Debt Instruments [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.75%

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