OWNERSHIP IN SUBSIDIARIES AND JOINT VENTURES - Ownership in Subsidiaries (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Sep. 01, 2024	Aug. 31, 2024
Summary of investment holdings [Line Items]
Retained Earnings (Accumulated Deficit)		$ (1,385)	$ 170
Acquisition of additional ownership interest			215
Deferred income taxes		247	(76)	$ 182
Non- controlling Interests
Summary of investment holdings [Line Items]
Acquisition of additional ownership interest			90
Total Stock- holders’ Equity
Summary of investment holdings [Line Items]
Acquisition of additional ownership interest			125
PT Freeport Indonesia
Summary of investment holdings [Line Items]
Net assets (liabilities) in subsidiary		17,200
Retained Earnings (Accumulated Deficit)		(12,700)
Freeport Minerals Corporation
Summary of investment holdings [Line Items]
Loans Payable		$ 0	0
Freeport Minerals Corporation | FCX
Summary of investment holdings [Line Items]
Ownership percentage		100.00%
Freeport Minerals Corporation | Subsidiaries
Summary of investment holdings [Line Items]
Net assets (liabilities) in subsidiary		$ 19,200
Retained Earnings (Accumulated Deficit)		$ 12,100
Morenci
Summary of investment holdings [Line Items]
Ownership percentage		72.00%
Other North America
Summary of investment holdings [Line Items]
Ownership percentage		100.00%
Cerro Verde
Summary of investment holdings [Line Items]
Ownership percentage					55.08%	53.56%
Shares acquired (in shares)	5.3
Balance acquired	$ 210
Deferred income taxes	5
Cerro Verde | Non- controlling Interests
Summary of investment holdings [Line Items]
Acquisition of additional ownership interest	90
Cerro Verde | Total Stock- holders’ Equity
Summary of investment holdings [Line Items]
Acquisition of additional ownership interest	$ 125
El Abra
Summary of investment holdings [Line Items]
Ownership percentage		51.00%
PT Freeport Indonesia
Summary of investment holdings [Line Items]
Ownership percentage		48.76%
Loans Payable		$ 0	0
Atlantic Copper
Summary of investment holdings [Line Items]
Ownership percentage		100.00%
Net assets (liabilities) in subsidiary		$ 89
Retained Earnings (Accumulated Deficit)		450
Loans Payable		$ 364	$ 644