Contingencies and Commitments - Litigation (Details) - Settled litigation $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) litigation
FCX affiliates
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	13
Louisiana Parishes Coastal Erosion Cases
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	42
Louisiana Parishes Coastal Erosion Cases | FCX affiliates
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number	13
Charges for Cerro Verde royalty dispute | $	$ 15
Litigation settlement, agreed to pay, initial payment | $	$ 15