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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 21, 2018
Schedule of Significant Accounting Policies [Line Items]        
Operating Lease, Right-of-Use Asset $ 207 $ 232    
Total cost of sales 11,655 13,125 $ 13,466  
Selling, general and administrative expenses 370 394 422  
Exploration Expense 50 104 105  
Environmental obligations and shutdown costs 159 105 89  
Costs and Expenses 11,761 13,311 13,874  
Operating income (loss) 2,437 1,091 4,754  
Accrued income taxes and timing of other tax payments 403 (29) (634)  
Net cash provided by (used in) operating activities 3,017 1,482 3,863  
Foreign currency transaction gains (losses), before tax 34 24 14  
Payments for (Proceeds from) Other Investing Activities (7) (12) (97)  
Net cash provided by (used in) investing activities (1,264) (2,103) (5,018)  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 1,625 (2,177) (255)  
Other income (expense), net $ 59 (138) 76  
PT Freeport Indonesia [Member]        
Schedule of Significant Accounting Policies [Line Items]        
Ownership percentage of subsidiary       48.76%
Production and Delivery Costs [Member]        
Schedule of Significant Accounting Policies [Line Items]        
Prior Period Reclassification Adjustment   $ 20 $ 21  
Copper        
Schedule of Significant Accounting Policies [Line Items]        
Percentage of ultimate copper recovery from leach stockpiles 90.00%      
Percentage of copper ultimately recoverable from newly placed material on active stockpiles extracted during the first year 80.00%      
PT Freeport Indonesia [Member] | PT Freeport Indonesia [Member]        
Schedule of Significant Accounting Policies [Line Items]        
Ownership percentage of subsidiary 48.76%