CONTINGENCIES (Environmental and Reclamation Programs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
New Mexico Environmental And Reclamation Programs
Site Contingency [Line Items]
Accrued reclamation and closure costs	$ 454
Arizona Environmental And Reclamation Programs
Site Contingency [Line Items]
Accrued reclamation and closure costs	345
Colorado Environmental And Reclamation Programs
Site Contingency [Line Items]
Accrued reclamation and closure costs	130
El Abra
Site Contingency [Line Items]
Accrued reclamation and closure costs	62
Cerro Verde
Site Contingency [Line Items]
Accrued reclamation and closure costs	125
Pt Freeport Indonesia Environmental And Reclamation Programs [Member]
Site Contingency [Line Items]
Accrued reclamation and closure costs	936
Mine Closure
Site Contingency [Line Items]
Funding restricted time deposit during period for closure and reclamation guarantees	92
Mine Reclamation
Site Contingency [Line Items]
Funding restricted time deposit during period for closure and reclamation guarantees	$ 8
MOEF Framework
Site Contingency [Line Items]
Permit Fees		$ 32