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COMMITMENTS AND GUARANTEES (Special Mining License (IUPK)) (Details) - USD ($) $ in Millions	12 Months Ended			21 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 21, 2018
Contractual Obligations Mining Contracts [Line Items]
Payments of Dividends			$ 0
Smelter Development Progress, Higher Threshold, Percent	50.00%
Royalty Expense	$ 330	$ 165	113
Export Duties Expense	218	92	221
Surety Bond
Contractual Obligations Mining Contracts [Line Items]
Assurance Bond, Smelter Development	$ 492
PT Freeport Indonesia
Contractual Obligations Mining Contracts [Line Items]
Progressive export duty on copper concentrates, lower threshold, percent	2.50%
Progressive export duty on copper concentrates, higher threshold, percent	5.00%			7.50%
Smelter Development Progress, Lower Threshold, Percent	30.00%
Royalty Expense	$ 319	160	106
Export Duties Expense	$ 218	92	$ 66
PT Freeport Indonesia \| Copper
Contractual Obligations Mining Contracts [Line Items]
Royalty Interest in Future Production	4.00%
PT Freeport Indonesia \| Gold
Contractual Obligations Mining Contracts [Line Items]
Royalty Interest in Future Production	3.75%
PT Freeport Indonesia \| Silver
Contractual Obligations Mining Contracts [Line Items]
Royalty Interest in Future Production	3.25%
PT Freeport Indonesia \| Construction Contracts \| Surety Bond
Contractual Obligations Mining Contracts [Line Items]
Assurance Bond, Smelter Development	$ 132
PT Freeport Indonesia
Contractual Obligations Mining Contracts [Line Items]
Payments of Dividends	1,300
PT Freeport Indonesia \| Intersegment Eliminations [Member]
Contractual Obligations Mining Contracts [Line Items]
Payments of Dividends	$ 1,000	$ 0
Tax Authority, In Papua, Indonesia
Contractual Obligations Mining Contracts [Line Items]
Foreign income tax rate under new stability agreement	25.00%
Foreign Profits Tax Rate on Net Income Under New Stability Agreement	10.00%
Annual Surface Water Tax Payments [Member] \| PT Freeport Indonesia
Contractual Obligations Mining Contracts [Line Items]
Payments for Other Taxes	$ 15