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General Information (Unaudited) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2023
Dec. 21, 2018
Net income (loss) $ (74) $ 1,035 $ 2   $ 1,852    
Freeport Cobalt | Held for sale              
Assets 135   135 $ 135      
Liabilities 20   20 20      
Consideration 150   150 150      
PT Freeport Indonesia              
Net income (loss) (56)   (4) (140)      
Investment owned, percent             81.00%
Net income (loss), FCX $ (46)   $ (3) $ (114)      
PT Freeport Indonesia | Forecast              
Investment owned, percent           48.76%  
PT-FI | PT Freeport Indonesia              
Investment owned, percent             19.00%
Lundin Mining Corporation | Freeport Cobalt | Held for sale              
Proceeds from transaction, percent 30.00%            
PT Freeport Indonesia | PT Indonesia Asahan Aluminium (Persero) (Inalum) [Member] | Forecast              
Investment owned, percent           26.24%  
PT Freeport Indonesia | PT Indonesia Papua Metal dan Mineral [Member] | Forecast              
Investment owned, percent           25.00%