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DEBT - Revolving Credit Facility (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Jul. 31, 2021
Debt Instruments [Line Items]      
Liabilities, Fair Value Adjustment $ 9 $ 10  
Debt Issuance Costs, Net 86 85  
Long-term Debt $ 9,450 9,711  
Freeport-McMoRan Oil & Gas      
Debt Instruments [Line Items]      
Ownership percentage 100.00%    
Revolving Credit Facility [Member] | Line of Credit [Member]      
Debt Instruments [Line Items]      
Long-term Debt $ 0 $ 0  
Long-term Line of Credit     $ 333
Line of Credit Facility, Remaining Borrowing Capacity 3,500    
Revolving Credit Facility [Member] | Line of Credit [Member] | PT Freeport Indonesia      
Debt Instruments [Line Items]      
Line of Credit Facility, Remaining Borrowing Capacity 500    
Revolving Credit Facility [Member] | Line of Credit Maturing April 2024 [Member]      
Debt Instruments [Line Items]      
Line of Credit Facility, Remaining Borrowing Capacity 3,280    
Revolving Credit Facility [Member] | Line of Credit Maturing April 2023 [Member]      
Debt Instruments [Line Items]      
Line of Credit Facility, Remaining Borrowing Capacity 220    
Letter of Credit [Member] | Line of Credit [Member]      
Debt Instruments [Line Items]      
Long-term Line of Credit 8    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,500