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INCOME TAXES (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 30, 2019
Jan. 01, 2017
Jan. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Income Taxes [Line Items]              
Total income taxes paid to all jurisdictions       $ 1,300 $ 397 $ 610  
Tax refunds received from all jurisdictions       109 265 $ 306  
Tax Attributes              
Foreign tax credits       1,536 1,641    
Valuation allowances       4,087 4,732    
Valuation allowance, increase (decrease)       645      
Deferred tax assets, alternative minimum tax refunds       $ 24 $ 244    
U.S. federal statutory tax rate       21.00% 21.00% 21.00%  
Interest on income taxes accrued       $ 620 $ 307 $ 339  
Unrecognized tax benefits       808 474 491 $ 494
Unrecognized tax benefits that would impact the effective tax rate       694      
Unrecognized tax benefits that would impact the effective tax rate, net of tax benefits       465      
PT Freeport Indonesia              
Tax Attributes              
Loss Contingency, Loss in Period, Including Tax Charges       384 46 304  
Valuation allowance for operating loss carryforwards              
Tax Attributes              
Valuation allowances       2,000      
Tax Year 2020              
Tax Attributes              
Unrecognized Tax Benefits, Period Increase (Decrease)       179      
Tax Year 2019              
Tax Attributes              
Unrecognized Tax Benefits, Period Increase (Decrease)       115      
Net Operating Losses              
Tax Attributes              
Valuation allowance, increase (decrease)       $ 219 250 44  
Domestic Deferred Tax Assets              
Tax Attributes              
Valuation allowance, increase (decrease)         (11) 208  
SUNAT | Cerro Verde              
Tax Attributes              
Foreign income tax rate under new stability agreement       32.00%      
Foreign Tax Authority              
Tax Attributes              
Tax Credit Carryforward, Valuation Allowance       $ 1,500      
Income Tax Credits and Adjustments       105 $ 75 $ 98  
Foreign Tax Authority | Tax Authority, Spain              
Tax Attributes              
Operating Loss Carryforwards       500      
Foreign Tax Authority | Tax Authority, In Papau, Indonesia              
Tax Attributes              
Operating Loss Carryforwards       $ 900      
Foreign Tax Authority | Chili - Service of Internal Taxes              
Tax Attributes              
U.S. federal statutory tax rate           35.00%  
Foreign Tax Authority | Chili - Service of Internal Taxes | Prior to September 2014              
Tax Attributes              
U.S. federal statutory tax rate       35.00%      
Foreign Tax Authority | Chili - Service of Internal Taxes | 2020 and thereafter              
Tax Attributes              
U.S. federal statutory tax rate         44.50%    
Foreign Tax Authority | Chili - Service of Internal Taxes | Tax years 2017 through 2021              
Tax Attributes              
U.S. federal statutory tax rate       35.00%      
Foreign Tax Authority | Chili - Service of Internal Taxes | Tax Year 2022 and Thereafter              
Tax Attributes              
U.S. federal statutory tax rate     44.50% 44.50%      
Foreign Tax Authority | Chili - Service of Internal Taxes | Tax Years 2018 to 2023 | Minimum              
Tax Attributes              
Mining royalty tax rate       5.00%      
Foreign Tax Authority | Chili - Service of Internal Taxes | Tax Years 2018 to 2023 | Maximum              
Tax Attributes              
Mining royalty tax rate       14.00%      
Foreign Tax Authority | SUNAT | 2019 and thereafter              
Tax Attributes              
U.S. federal statutory tax rate           26.00%  
Dividend tax rate           9.30%  
Foreign Tax Authority | SUNAT | 2017              
Tax Attributes              
Dividend tax rate   5.00%          
Corporate Income Tax Rate   29.50%          
Foreign Tax Authority | Settlement with Taxing Authority | Tax Years 2012 to 2018              
Tax Attributes              
Payments for legal settlements $ 250            
Domestic Tax Authority              
Tax Attributes              
Operating Loss Carryforwards       $ 6,100      
Valuation allowances       561      
State and Local Jurisdiction              
Tax Attributes              
Operating Loss Carryforwards       10,900      
PT Rio Tinto | Net Operating Losses              
Tax Attributes              
Valuation allowance, increase (decrease)       228      
Indefinite-Lived Carryforward              
Tax Attributes              
Operating Loss Carryforwards       200      
Other (expense) benefit | PT Freeport Indonesia              
Tax Attributes              
Loss Contingency, Loss in Period, Including Tax Charges       155 $ 9 $ 123  
Interest expense | PT Freeport Indonesia              
Tax Attributes              
Loss Contingency, Loss in Period, Including Tax Charges       43 35 78  
Income expense (benefit) | PT Freeport Indonesia              
Tax Attributes              
Loss Contingency, Loss in Period, Including Tax Charges       $ 186 $ 2 $ 103