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BUSINESS SEGMENTS INFORMATION (Segment Reporting) (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 36 Months Ended
May 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Segment Reporting Information [Line Items]                  
Revenues         $ 14,198 $ 14,402 $ 18,628    
Production and delivery         10,031 11,534 11,708    
Depreciation, depletion and amortization         1,528 1,412 1,754    
Inventory Adjustment         96 179 4    
Selling, general and administrative expenses         370 394 422    
Mining exploration and research expenses         50 104 105    
Environmental obligations and shutdown costs         159 105 89    
Net gain on sales of assets         (473) (417) (208)    
Operating income (loss)         2,437 1,091 4,754    
Interest expense, net         598 620 945    
Provision for (benefit from) income taxes         (944) (510) (991)    
Total assets   $ 42,216 $ 42,144 $ 42,216 42,144 40,809 42,216   $ 40,809
Capital expenditures         1,961 2,652 1,971    
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount       (504) 0 0      
Current Federal Tax Expense (Benefit)         53 (23) 46    
Effective Income Tax Rate Reconciliation, Adjustment in Deferred Tax Assets         0 49 0    
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount         210 149 (129)    
Gain on Sale of Investments         486        
Sale of Investment, Tax Expense         (135)        
Covid-19 [Member]                  
Segment Reporting Information [Line Items]                  
Idle Facility Costs         258        
Cerro Verde | Covid-19 [Member]                  
Segment Reporting Information [Line Items]                  
Idle Facility Costs         89        
Grasberg Segment [Member]                  
Segment Reporting Information [Line Items]                  
Capital expenditures         1,266 1,369 1,001    
Molybdenum                  
Segment Reporting Information [Line Items]                  
Capital expenditures         19 19 9    
Rod & Refining | Covid-19 [Member]                  
Segment Reporting Information [Line Items]                  
Idle Facility Costs         30        
South America                  
Segment Reporting Information [Line Items]                  
Capital expenditures         183 256 237    
North America copper mines                  
Segment Reporting Information [Line Items]                  
Capital expenditures         428 877 601    
Indonesia                  
Segment Reporting Information [Line Items]                  
Revenues         1,760 1,894 2,226    
Operating Segments | Molybdenum                  
Segment Reporting Information [Line Items]                  
Revenues         0 0 0    
Production and delivery         230 299 289    
Depreciation, depletion and amortization         57 62 79    
Inventory Adjustment         10 50 0    
Selling, general and administrative expenses         0 0 0    
Mining exploration and research expenses         0 0 0    
Environmental obligations and shutdown costs         0 0 0    
Net gain on sales of assets         0 0 0    
Operating income (loss)         (75) (67) 42    
Interest expense, net         0 0 0    
Provision for (benefit from) income taxes         0 0 0    
Total assets   1,796 1,760 1,796 1,760 1,798 1,796   1,798
Capital expenditures         19 19 9    
Operating Segments | Rod & Refining                  
Segment Reporting Information [Line Items]                  
Revenues         4,781 4,457 5,103    
Production and delivery         4,819 4,475 5,117    
Depreciation, depletion and amortization         16 9 11    
Inventory Adjustment         3 0 0    
Selling, general and administrative expenses         0 0 0    
Mining exploration and research expenses         0 0 0    
Environmental obligations and shutdown costs         1 0 0    
Net gain on sales of assets         0 0 0    
Operating income (loss)         (25) (1) 6    
Interest expense, net         0 0 0    
Provision for (benefit from) income taxes         0 0 0    
Total assets   233 211 233 211 193 233   193
Capital expenditures         6 5 5    
Operating Segments | Atlantic Copper Smelting & Refining                  
Segment Reporting Information [Line Items]                  
Revenues         2,020 2,063 2,299    
Production and delivery         1,962 1,971 2,218    
Depreciation, depletion and amortization         29 28 27    
Inventory Adjustment         0 0 0    
Selling, general and administrative expenses         21 20 21    
Mining exploration and research expenses         0 0 0    
Environmental obligations and shutdown costs         0 0 0    
Net gain on sales of assets         0 0 0    
Operating income (loss)         25 49 36    
Interest expense, net         6 22 25    
Provision for (benefit from) income taxes         (2) (5) (1)    
Total assets   773 877 773 877 761 773   761
Capital expenditures         29 34 16    
Operating Segments | North America                  
Segment Reporting Information [Line Items]                  
Revenues         77 367 144    
Production and delivery         3,100 3,319 3,124    
Depreciation, depletion and amortization         355 349 360    
Inventory Adjustment         52 30 4    
Selling, general and administrative expenses         4 4 6    
Mining exploration and research expenses         2 2 3    
Environmental obligations and shutdown costs         (1) 1 2    
Net gain on sales of assets         0 0 0    
Operating income (loss)         852 681 1,195    
Interest expense, net         2 4 4    
Provision for (benefit from) income taxes         0 0 0    
Total assets   7,530 7,737 7,530 7,737 7,989 7,530   7,989
Capital expenditures         428 877 601    
Operating Segments | North America | Morenci                  
Segment Reporting Information [Line Items]                  
Revenues         29 143 90    
Production and delivery         1,269 1,376 1,183    
Depreciation, depletion and amortization         166 171 176    
Inventory Adjustment         4 1 0    
Selling, general and administrative expenses         2 2 3    
Mining exploration and research expenses         0 0 0    
Environmental obligations and shutdown costs         0 1 0    
Net gain on sales of assets         0 0 0    
Operating income (loss)         603 456 779    
Interest expense, net         2 3 3    
Provision for (benefit from) income taxes         0 0 0    
Total assets   2,922 2,574 2,922 2,574 2,880 2,922   2,880
Capital expenditures         102 231 216    
Operating Segments | North America | Other                  
Segment Reporting Information [Line Items]                  
Revenues         48 224 54    
Production and delivery         1,831 1,943 1,941    
Depreciation, depletion and amortization         189 178 184    
Inventory Adjustment         48 29 4    
Selling, general and administrative expenses         2 2 3    
Mining exploration and research expenses         2 2 3    
Environmental obligations and shutdown costs         (1) 0 2    
Net gain on sales of assets         0 0 0    
Operating income (loss)         249 225 416    
Interest expense, net         0 1 1    
Provision for (benefit from) income taxes         0 0 0    
Total assets   4,608 5,163 4,608 5,163 5,109 4,608   5,109
Capital expenditures         326 646 385    
Operating Segments | South America                  
Segment Reporting Information [Line Items]                  
Revenues         2,713 3,075 3,303    
Production and delivery         1,978 2,326 2,365    
Depreciation, depletion and amortization         421 474 546    
Inventory Adjustment         3 2 0    
Selling, general and administrative expenses         6 8 9    
Mining exploration and research expenses         0 0 0    
Environmental obligations and shutdown costs         0 0 0    
Net gain on sales of assets         0 0 0    
Operating income (loss)         547 578 735    
Interest expense, net         139 114 429    
Provision for (benefit from) income taxes         (239) (239) (268)    
Total assets   10,231 10,152 10,231 10,152 10,288 10,231   10,288
Capital expenditures         183 256 237    
Operating Segments | South America | Cerro Verde                  
Segment Reporting Information [Line Items]                  
Revenues         2,282 2,576 2,709    
Production and delivery         1,599 1,852 1,887    
Depreciation, depletion and amortization         367 406 456    
Inventory Adjustment         0 2 0    
Selling, general and administrative expenses         6 8 9    
Mining exploration and research expenses         0 0 0    
Environmental obligations and shutdown costs         0 0 0    
Net gain on sales of assets         0 0 0    
Operating income (loss)         552 621 709    
Interest expense, net         139 114 429    
Provision for (benefit from) income taxes         (238) (250) (253)    
Total assets   8,524 8,474 8,524 8,474 8,612 8,524   8,612
Capital expenditures         141 232 220    
Operating Segments | South America | Other                  
Segment Reporting Information [Line Items]                  
Revenues         431 499 594    
Production and delivery         379 474 478    
Depreciation, depletion and amortization         54 68 90    
Inventory Adjustment         3 0 0    
Selling, general and administrative expenses         0 0 0    
Mining exploration and research expenses         0 0 0    
Environmental obligations and shutdown costs         0 0 0    
Net gain on sales of assets         0 0 0    
Operating income (loss)         (5) (43) 26    
Interest expense, net         0 0 0    
Provision for (benefit from) income taxes         (1) 11 (15)    
Total assets   1,707 1,678 1,707 1,678 1,676 1,707   1,676
Capital expenditures         42 24 17    
Operating Segments | Indonesia | Grasberg Segment [Member]                  
Segment Reporting Information [Line Items]                  
Revenues         3,534 2,713 5,446    
Production and delivery         1,606 2,055 1,864    
Depreciation, depletion and amortization         580 406 606    
Inventory Adjustment         0 5 0    
Selling, general and administrative expenses         108 125 123    
Mining exploration and research expenses         0 0 0    
Environmental obligations and shutdown costs         0 0 0    
Net gain on sales of assets         0 0 0    
Operating income (loss)         1,320 180 2,966    
Interest expense, net         39 82 1    
Provision for (benefit from) income taxes         (606) (167) (755)    
Total assets   15,646 17,169 15,646 17,169 16,485 15,646   16,485
Capital expenditures         1,266 1,369 1,001    
Operating Segments | Indonesia | Grasberg Segment [Member] | Surface Water Tax Adjustment [Member]                  
Segment Reporting Information [Line Items]                  
Production and delivery           28 223    
Corporate And Eliminations [Member]                  
Segment Reporting Information [Line Items]                  
Revenues         1,073 1,727 2,333    
Production and delivery         (3,664) (2,911) (3,269)    
Depreciation, depletion and amortization         70 84 125    
Inventory Adjustment         28 92 0    
Selling, general and administrative expenses         231 237 263    
Mining exploration and research expenses         48 102 102    
Environmental obligations and shutdown costs         159 104 87    
Net gain on sales of assets         (473) (417) (208)    
Operating income (loss)         (207) (329) (226)    
Interest expense, net         412 398 486    
Provision for (benefit from) income taxes         (97) (99) 33    
Total assets   6,007 4,238 6,007 4,238 3,295 6,007   3,295
Capital expenditures         30 92 102    
Corporate And Eliminations [Member] | Covid-19 [Member]                  
Segment Reporting Information [Line Items]                  
Idle Facility Costs         57        
Intersegment                  
Segment Reporting Information [Line Items]                  
Revenues         0 0 0    
Intersegment | Molybdenum                  
Segment Reporting Information [Line Items]                  
Revenues         222 344 410    
Intersegment | Rod & Refining                  
Segment Reporting Information [Line Items]                  
Revenues         33 26 31    
Intersegment | Atlantic Copper Smelting & Refining                  
Segment Reporting Information [Line Items]                  
Revenues         17 5 3    
Intersegment | Corporate And Eliminations [Member]                  
Segment Reporting Information [Line Items]                  
Revenues         (4,881) (4,765) (5,459)    
Intersegment | North America                  
Segment Reporting Information [Line Items]                  
Revenues         4,287 4,019 4,550    
Intersegment | North America | Morenci                  
Segment Reporting Information [Line Items]                  
Revenues         2,015 1,864 2,051    
Intersegment | North America | Other                  
Segment Reporting Information [Line Items]                  
Revenues         2,272 2,155 2,499    
Intersegment | South America                  
Segment Reporting Information [Line Items]                  
Revenues         242 313 352    
Intersegment | South America | Cerro Verde                  
Segment Reporting Information [Line Items]                  
Revenues         242 313 352    
Intersegment | South America | Other                  
Segment Reporting Information [Line Items]                  
Revenues         0 0 0    
Intersegment | Indonesia | Grasberg Segment [Member]                  
Segment Reporting Information [Line Items]                  
Revenues         80 58 113    
Unfavorable Regulatory Actions | Operating Segments | Indonesia | Grasberg Segment [Member]                  
Segment Reporting Information [Line Items]                  
Provision for (benefit from) income taxes         35        
Royalty Assessments | Operating Segments | South America | Cerro Verde                  
Segment Reporting Information [Line Items]                  
Production and delivery             (14)    
Interest expense, net             370    
Cerro Verde Royalty Dispute | Operating Segments | South America | Cerro Verde                  
Segment Reporting Information [Line Items]                  
Production and delivery             (69)    
Cerro Verde Royalty Dispute | Royalty Assessments | Cerro Verde                  
Segment Reporting Information [Line Items]                  
Production and delivery           6 14 $ 203 223
Interest expense, net           10 370 145 525
Provision for (benefit from) income taxes           2 35 $ (7) 30
Surface Water Taxes, Papua, Indonesia [Member]                  
Segment Reporting Information [Line Items]                  
Production and delivery $ 28 69              
Asbestos Contamination in Talc-Based Personal Care Products [Member]                  
Segment Reporting Information [Line Items]                  
Settlement expense         130 0 0    
Gulf of Mexico Shelf and Madden properties [Member] | Corporate And Eliminations [Member]                  
Segment Reporting Information [Line Items]                  
Net gain on sales of assets           (20)      
Freeport Cobalt | Corporate And Eliminations [Member]                  
Segment Reporting Information [Line Items]                  
Depreciation, depletion and amortization             31    
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset             31    
Gain on Environmental Remediation Expense Adjustment             97    
Timok, Lower Zone [Member]                  
Segment Reporting Information [Line Items]                  
Current Federal Tax Expense (Benefit)         53 (53)      
PT Freeport Indonesia [Member]                  
Segment Reporting Information [Line Items]                  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount         $ 0 0 (504)    
Loss Contingency, Loss in Period, Including Tax Charges     42     304      
Deferred Tax Assets, Tax Credit Carryforwards   549   549     549    
PT Freeport Indonesia [Member] | Tax Adjustment [Member]                  
Segment Reporting Information [Line Items]                  
Deferred Tax Assets, Tax Credit Carryforwards   20   20     20    
Minimum Tax Credit Carryforwards [Member]                  
Segment Reporting Information [Line Items]                  
Foreign Income Tax Expense (Benefit), Continuing Operations             47    
Federal Income Tax Expense (Benefit), Continuing Operations             76    
Judicial Ruling | December 2006 to Tax Year 2013 | Cerro Verde Royalty Dispute | Unfavorable Regulatory Actions                  
Segment Reporting Information [Line Items]                  
Provision for (benefit from) income taxes             35    
Indonesia Tax Authority | PT Freeport Indonesia [Member] | Memorandum of Understanding with the Indonesian Government, Indonesia Supreme Court Appeal [Member]                  
Segment Reporting Information [Line Items]                  
Loss Contingency, Loss in Period           155      
IUPK [Member] | PT Freeport Indonesia [Member]                  
Segment Reporting Information [Line Items]                  
Deferred Tax Assets, Tax Credit Carryforwards   482   482     482    
IUPK [Member] | Minimum Tax Credit Carryforwards [Member]                  
Segment Reporting Information [Line Items]                  
Federal Income Tax Expense (Benefit), Continuing Operations             22    
Internal Revenue Service (IRS) [Member] | PT Freeport Indonesia [Member]                  
Segment Reporting Information [Line Items]                  
Deferred Tax Assets, Tax Credit Carryforwards   $ 47   $ 47     $ 47    
Interest expense | PT Freeport Indonesia [Member]                  
Segment Reporting Information [Line Items]                  
Loss Contingency, Loss in Period, Including Tax Charges     35     78      
Income expense (benefit) | PT Freeport Indonesia [Member]                  
Segment Reporting Information [Line Items]                  
Loss Contingency, Loss in Period, Including Tax Charges     $ 2     103      
Disposed of by Sale, Discontinued Operations | Timok                  
Segment Reporting Information [Line Items]                  
Gain (Loss) on Disposition of Business           343      
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | Freeport Cobalt                  
Segment Reporting Information [Line Items]                  
Disposal Group, Including Discontinued Operation, Cash           $ 59     $ 59