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Contingencies and Commitments (Unaudited) Mining Contract (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2022
Sep. 27, 2018
Contractual Obligations Mining Contracts [Line Items]        
Term to construct smelter   5 years    
PT Freeport Indonesia [Member]        
Contractual Obligations Mining Contracts [Line Items]        
Proceeds from divestiture of businesses, pending $ 350      
Rio Tinto [Member] | Rio Tinto Share In Joint Venture [Member]        
Contractual Obligations Mining Contracts [Line Items]        
Proceeds from divestiture of businesses, pending $ 3,500      
Pt Smelting [Member] | PT Freeport Indonesia [Member]        
Contractual Obligations Mining Contracts [Line Items]        
Investment Owned, Percent of Net Assets 25.00% 25.00%    
Interest In PT Indocopper Investama [Member] | PT Indonesia Asahan Aluminium (Persero) (Inalum) [Member]        
Contractual Obligations Mining Contracts [Line Items]        
Ownership percentage pending acquired       100.00%
PT Freeport Indonesia [Member] | PT Indonesia Asahan Aluminium (Persero) (Inalum) [Member]        
Contractual Obligations Mining Contracts [Line Items]        
Ownership percentage pending acquired       40.00%
Ownership interest subsequent to acquisition, pending       51.00%
PT Freeport Indonesia [Member]        
Contractual Obligations Mining Contracts [Line Items]        
Ownership interest by parent subsequent to business acquisition, pending       49.00%
PT Indocopper Investama [Member] | PT Freeport Indonesia [Member]        
Contractual Obligations Mining Contracts [Line Items]        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 9.36% 9.36%    
PT Indocopper Investama [Member] | Scenario, Forecast [Member] | PT Freeport Indonesia [Member]        
Contractual Obligations Mining Contracts [Line Items]        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     5.60%  
PT Indonesia Asahan Aluminium (Persero) (Inalum) [Member] | PT Freeport Indonesia [Member]        
Contractual Obligations Mining Contracts [Line Items]        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 9.36% 9.36%