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CONTINGENCIES (Tax and Other Matters) (Details) $ in Millions, Rp in Billions		1 Months Ended									12 Months Ended				21 Months Ended
	Jan. 07, 2021 USD ($)	Feb. 28, 2021 USD ($)	Feb. 28, 2021 IDR (Rp)	Oct. 31, 2019 USD ($)	Oct. 31, 2019 IDR (Rp)	Sep. 30, 2019 USD ($)	May 31, 2019 USD ($)	May 31, 2019 IDR (Rp)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 IDR (Rp)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018	Dec. 21, 2018 USD ($)	Feb. 15, 2022 USD ($)	Jan. 25, 2022 USD ($)
Income Tax Examination [Line Items]
Long-term receivable for taxes											$ 84.0	$ 106.0
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization											12,016.0	10,031.0	$ 11,534.0
Export Duties Expense											218.0	92.0	221.0
Surface Water Taxes, Papua, Indonesia
Income Tax Examination [Line Items]
Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization							$ 28.0		$ 69.0
Judicial Ruling \| Cerro Verde Royalty Dispute \| Tax Year 2006 To Tax Year 2008 \| Royalty Assessments
Income Tax Examination [Line Items]
Payments for legal settlements											$ 421.0
PT-FI
Income Tax Examination [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%
Export Duties Expense											$ 218.0	92.0	$ 66.0
Loss contingency, loss in period											16.0
Administrative Fees Expense	$ 149.0
Income tax examination, assessments, penalties and interest not accrued											500.0
PT-FI \| Subsequent Event
Income Tax Examination [Line Items]
Loss contingency, estimate of possible loss																$ 37.0	$ 57.0
Cerro Verde
Income Tax Examination [Line Items]
Income tax examination, assessments, penalties and interest not accrued											300.0
FCX Affiliates \| Settled Litigation \| Louisiana Parishes Coastal Erosion Cases
Income Tax Examination [Line Items]
Settlement amount						$ 23.5
SUNAT \| PT-FI
Income Tax Examination [Line Items]
Long-term receivable for taxes											278.0
Increase (decrease) in income taxes receivable											221.0
SUNAT \| Cerro Verde
Income Tax Examination [Line Items]
Long-term receivable for taxes											642.0
Increase (decrease) in income taxes receivable											405.0
Tax Authority, In Papau, Indonesia \| PT-FI \| Surface Water Taxes, Papua, Indonesia \| Penalties
Income Tax Examination [Line Items]
Payments for legal settlements		$ 48.0	Rp 685.5	$ 50.0	Rp 708.5
Settlement amount							$ 99.0	Rp 1,394.0		Rp 1,000,000,000,000,000.0
Indonesian Supreme Court \| PT-FI \| The year 2005 and the year 2007
Income Tax Examination [Line Items]
Loss contingency, loss in period												47.0
Cerro Verde
Income Tax Examination [Line Items]
Long-term receivable for taxes											237.0	190.0
PT-FI
Income Tax Examination [Line Items]
Long-term receivable for taxes											$ 57.0	143.0
Indonesia Tax Authority \| PT-FI \| Memorandum of Understanding with the Indonesian Government
Income Tax Examination [Line Items]
Progressive export duty on copper concentrates, lower threshold, percent														5.00%
Progressive export duty on copper concentrates, higher threshold, percent															7.50%
Export Duties Expense															$ 155.0
Litigation Settlement, Amount Awarded from Other Party												29.0
Indonesia Tax Authority \| PT-FI \| Memorandum of Understanding with the Indonesian Government, Indonesia Supreme Court Appeal
Income Tax Examination [Line Items]
Loss contingency, loss in period												$ 155.0