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General Information (Unaudited) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2023
Dec. 21, 2018
Net income (loss) $ (234) $ 664 $ (232)   $ 2,516    
Freeport Cobalt | Held for sale              
Assets 201   201 $ 201      
Liabilities 76   76 76      
Consideration 150   150 150      
PT Freeport Indonesia              
Net income (loss) 24   28 164      
Investment owned, percent             81.00%
Net income (loss), FCX $ 20   $ 23 $ 133      
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%