Contingencies and Commitments - Indonesia Regulatory Matters (Details)	1 Months Ended	3 Months Ended	9 Months Ended
	Mar. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 08, 2025 fatality metricTon	Mar. 17, 2025 metricTon
Loss Contingencies [Line Items]
Number of fatalities | fatality				7
Weight of wet material | metricTon				800,000
Export License, Volume | metricTon					1,400,000
Export duty to be paid, percent			7.50%
Export Proceeds, Percent		100.00%
Administrative fine	$ 59,000,000
Operating Segments | Indonesia | Grasberg Segment | Mud Rush
Loss Contingencies [Line Items]
Recovery costs		$ 43,000,000	$ 43,000,000
PT Freeport Indonesia
Loss Contingencies [Line Items]
Incident charges		195,000,000
Idle facility costs		152,000,000
Recovery costs		43,000,000
Asset Impairment Charges		0
Maximum loss limit		1,000,000,000
Maximum loss limit on underground incidents		700,000,000
Deductible amount		$ 500,000,000