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Contingencies and Commitments (Unaudited) - Tax and Other Matters (Details)
$ in Millions, Rp in Billions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
IDR (Rp)
Mar. 31, 2019
Dec. 21, 2018
Loss Contingencies [Line Items]                
Production and delivery $ 3,002 $ 2,915 $ 5,978 $ 5,723        
Surface Water Taxes, Papua, Indonesia                
Loss Contingencies [Line Items]                
Production and delivery $ 28              
Surface Water Taxes, Papua, Indonesia | PT Freeport Indonesia | Annual surface water tax payments                
Loss Contingencies [Line Items]                
Payments for taxes     $ 15          
Surface Water Taxes, Papua, Indonesia | PT Freeport Indonesia | Tax Authority, In Papau, Indonesia | Penalties                
Loss Contingencies [Line Items]                
Loss contingency, offer         $ 69      
Litigation settlement, agreed to pay         $ 99 Rp 1,394    
PT Freeport Indonesia                
Loss Contingencies [Line Items]                
Investment owned, percent               81.00%
PT Freeport Indonesia | Pt Smelting                
Loss Contingencies [Line Items]                
Investment owned, percent             25.00%