Contingencies and Commitments (Unaudited) - Litigation (Details) $ in Millions	1 Months Ended
	Oct. 31, 2019 USD ($)	Sep. 30, 2019 case	Mar. 13, 2019 USD ($)
Settled litigation | Louisiana Parishes Coastal Erosion Cases | FCX affiliates
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number | case		13
Litigation settlement, agreed to pay, initial payment	$ 15
Pending litigation | Asbestos contamination in talc-based personal care products | Asbestos contamination | Johnson & Johnson and Cyprus Mines
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss			$ 29
Pending litigation | Asbestos contamination in talc-based personal care products | Asbestos contamination | Cyprus Mines
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss			$ 2