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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Segment Reporting Information [Line Items]                            
Revenues     $ 3,911 $ 3,153 $ 3,546 $ 3,792 $ 3,684 $ 4,908 $ 5,168 $ 4,868 $ 14,402 $ 18,628 $ 16,403  
Production and delivery                     11,514 11,687 10,258  
Depreciation, depletion and amortization                     1,412 1,754 1,714  
Metals inventory adjustments     79 41 59           179 4 8  
Selling, general and administrative expenses                     414 443 477  
Mining exploration and research expenses                     104 105 93  
Environmental obligations and shutdown costs                     105 89 244  
Net gain on sales of assets             (82) (70) (45) (11) (417) (208) (81)  
Operating income (loss)     775 (38) $ 33 $ 321 316 $ 1,315 $ 1,664 $ 1,459 1,091 4,754 3,690  
Interest expense, net                     620 945 801  
Provision for income taxes                     510 991 883  
Total assets   $ 42,216 40,809       42,216       40,809 42,216 37,302 $ 40,809
Capital expenditures                     2,652 1,971 1,410  
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount                     0 (504) 0  
Federal Income Tax Expense (Benefit), Continuing Operations                       22    
Current Federal Tax Expense (Benefit)                     23 (46) 3  
Effective Income Tax Rate Reconciliation, Adjustment in Deferred Tax Assets                     49 0 0  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount                     149 (129) (28)  
Cerro Verde                            
Segment Reporting Information [Line Items]                            
Loss Contingency, Loss in Period                     16      
Provision for income taxes                     (2)      
Grasberg Segment [Member]                            
Segment Reporting Information [Line Items]                            
Capital expenditures                     1,369 1,001 875  
Molybdenum                            
Segment Reporting Information [Line Items]                            
Capital expenditures                     19 9 5  
South America                            
Segment Reporting Information [Line Items]                            
Capital expenditures                     256 237 115  
North America copper mines                            
Segment Reporting Information [Line Items]                            
Capital expenditures                     877 601 167  
Indonesia                            
Segment Reporting Information [Line Items]                            
Revenues                     1,894 2,226 2,023  
Operating Segments | Molybdenum                            
Segment Reporting Information [Line Items]                            
Revenues                     0 0 0  
Production and delivery                     299 289 226  
Depreciation, depletion and amortization                     62 79 76  
Metals inventory adjustments                     50 0 1  
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)                     (67) 42 (35)  
Interest expense, net                     0 0 0  
Provision for income taxes                     0 0 0  
Total assets   1,796 1,798       1,796       1,798 1,796 1,858 1,798
Capital expenditures                     19 9 5  
Operating Segments | Rod & Refining                            
Segment Reporting Information [Line Items]                            
Revenues                     4,457 5,103 4,456  
Production and delivery                     4,475 5,117 4,467  
Depreciation, depletion and amortization                     9 11 10  
Metals inventory adjustments                     0 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)                     (1) 6 5  
Interest expense, net                     0 0 0  
Provision for income taxes                     0 0 0  
Total assets   233 193       233       193 233 277 193
Capital expenditures                     5 5 4  
Operating Segments | Atlantic Copper Smelting & Refining                            
Segment Reporting Information [Line Items]                            
Revenues                     2,063 2,299 2,031  
Production and delivery                     1,971 2,218 1,966  
Depreciation, depletion and amortization                     28 27 28  
Metals inventory adjustments                     0 0 0  
Selling, general and administrative expenses                     20 21 18  
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)                     49 36 20  
Interest expense, net                     22 25 18  
Provision for income taxes                     5 1 5  
Total assets   773 761       773       761 773 822 761
Capital expenditures                     34 16 41  
Operating Segments | North America                            
Segment Reporting Information [Line Items]                            
Revenues                     367 144 408  
Production and delivery                     3,319 3,124 2,743  
Depreciation, depletion and amortization                     349 360 425  
Metals inventory adjustments                     30 4 2  
Selling, general and administrative expenses                     4 6 4  
Mining exploration and research expenses                     2 3 2  
Environmental obligations and shutdown costs                     1 2 0  
Net gain on sales of assets                     0 0 0  
Operating income (loss)                     681 1,195 1,389  
Interest expense, net                     4 4 4  
Provision for income taxes                     0 0 0  
Total assets   7,530 7,989       7,530       7,989 7,530 7,102 7,989
Capital expenditures                     877 601 167  
Operating Segments | North America | Morenci                            
Segment Reporting Information [Line Items]                            
Revenues                     143 90 228  
Production and delivery                     1,376 1,183 1,043  
Depreciation, depletion and amortization                     171 176 178  
Metals inventory adjustments                     1 0 0  
Selling, general and administrative expenses                     2 3 2  
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)                     456 779 870  
Interest expense, net                     3 3 3  
Provision for income taxes                     0 0 0  
Total assets   2,922 2,880       2,922       2,880 2,922 2,861 2,880
Capital expenditures                     231 216 114  
Operating Segments | North America | Bagdad [Member]                            
Segment Reporting Information [Line Items]                            
Revenues                     0 0 22  
Production and delivery                     512 483 367  
Depreciation, depletion and amortization                     46 41 40  
Metals inventory adjustments                     0 0 0  
Selling, general and administrative expenses                     1 1 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)                     204 185 143  
Interest expense, net                       0 0  
Provision for income taxes                     0 0 0  
Total assets   671 783       671       783 671 650 783
Capital expenditures                     150 39 12  
Operating Segments | North America | Other                            
Segment Reporting Information [Line Items]                            
Revenues                     224 54 158  
Production and delivery                     1,431 1,458 1,333  
Depreciation, depletion and amortization                     132 143 207  
Metals inventory adjustments                     29 4 2  
Selling, general and administrative expenses                     1 2 2  
Mining exploration and research expenses                     2 3 2  
Environmental obligations and shutdown costs                     0 2 0  
Net gain on sales of assets                     0 0 0  
Operating income (loss)                     21 231 376  
Interest expense, net                     1 1 1  
Provision for income taxes                     0 0 0  
Total assets   3,937 4,326       3,937       4,326 3,937 3,591 4,326
Capital expenditures                     496 346 41  
Operating Segments | Bagdad [Member] | Bagdad [Member]                            
Segment Reporting Information [Line Items]                            
Interest expense, net                     0      
Operating Segments | South America                            
Segment Reporting Information [Line Items]                            
Revenues                     3,075 3,303 3,309  
Production and delivery                     2,326 2,365 2,244  
Depreciation, depletion and amortization                     474 546 525  
Metals inventory adjustments                     2 0 0  
Selling, general and administrative expenses                     8 9 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)                     578 735 916  
Interest expense, net                     114 429 212  
Provision for income taxes                     239 268 446  
Total assets   10,231 10,288       10,231       10,288 10,231 10,580 10,288
Capital expenditures                     256 237 115  
Operating Segments | South America | Cerro Verde                            
Segment Reporting Information [Line Items]                            
Revenues                     2,576 2,709 2,811  
Production and delivery                     1,852 1,887 1,878  
Depreciation, depletion and amortization                     406 456 441  
Metals inventory adjustments                     2 0 0  
Selling, general and administrative expenses                     8 9 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)                     621 709 868  
Interest expense, net                     114 429 212  
Provision for income taxes                     250 253 436  
Total assets   8,524 8,612       8,524       8,612 8,524 8,878 8,612
Capital expenditures                     232 220 103  
Operating Segments | South America | Other                            
Segment Reporting Information [Line Items]                            
Revenues                     499 594 498  
Production and delivery                     474 478 366  
Depreciation, depletion and amortization                     68 90 84  
Metals inventory adjustments                     0 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)                     (43) 26 48  
Interest expense, net                     0 0 0  
Provision for income taxes                     (11) 15 10  
Total assets   1,707 1,676       1,707       1,676 1,707 1,702 1,676
Capital expenditures                     24 17 12  
Operating Segments | Indonesia | Grasberg Segment [Member]                            
Segment Reporting Information [Line Items]                            
Revenues                     2,713 5,446 4,445  
Production and delivery                     2,055 1,864 1,735  
Loss Contingency, Loss in Period                       223    
Depreciation, depletion and amortization                     406 606 556  
Metals inventory adjustments                     5 0 0  
Selling, general and administrative expenses                     125 123 126  
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)                     180 2,966 2,028  
Interest expense, net                     82 1 4  
Provision for income taxes                     167 755 869  
Total assets   15,646 16,485       15,646       16,485 15,646 10,911 16,485
Capital expenditures                     1,369 1,001 875  
Adjustment to Historical Tax Positions                       20    
Corporate And Eliminations [Member]                            
Segment Reporting Information [Line Items]                            
Revenues                     1,727 2,333 1,754  
Production and delivery                     (2,931) (3,290) (3,123)  
Depreciation, depletion and amortization                     84 125 94  
Metals inventory adjustments                     92 0 5  
Selling, general and administrative expenses                     257 284 320  
Mining exploration and research expenses                     102 102 91  
Environmental obligations and shutdown costs                     104 87 244  
Net gain on sales of assets                     (417) (208) (81)  
Operating income (loss)                     (329) (226) (633)  
Interest expense, net                     398 486 563  
Provision for income taxes                     99 (33) (437)  
Total assets   6,007 3,295       6,007       3,295 6,007 5,752 3,295
Capital expenditures                     92 102 203  
Intersegment                            
Segment Reporting Information [Line Items]                            
Revenues                     0 0 0  
Intersegment | Molybdenum                            
Segment Reporting Information [Line Items]                            
Revenues                     344 410 268  
Intersegment | Rod & Refining                            
Segment Reporting Information [Line Items]                            
Revenues                     26 31 26  
Intersegment | Atlantic Copper Smelting & Refining                            
Segment Reporting Information [Line Items]                            
Revenues                     5 3 1  
Intersegment | Corporate And Eliminations [Member]                            
Segment Reporting Information [Line Items]                            
Revenues                     (4,765) (5,459) (4,837)  
Intersegment | North America                            
Segment Reporting Information [Line Items]                            
Revenues                     4,019 4,550 4,157  
Intersegment | North America | Morenci                            
Segment Reporting Information [Line Items]                            
Revenues                     1,864 2,051 1,865  
Intersegment | North America | Bagdad [Member]                            
Segment Reporting Information [Line Items]                            
Revenues                     763 710 528  
Intersegment | North America | Other                            
Segment Reporting Information [Line Items]                            
Revenues                     1,392 1,789 1,764  
Intersegment | South America                            
Segment Reporting Information [Line Items]                            
Revenues                     313 352 385  
Intersegment | South America | Cerro Verde                            
Segment Reporting Information [Line Items]                            
Revenues                     313 352 385  
Intersegment | South America | Other                            
Segment Reporting Information [Line Items]                            
Revenues                     0 0 0  
Intersegment | Indonesia | Grasberg Segment [Member]                            
Segment Reporting Information [Line Items]                            
Revenues                     58 113 0  
One-time Termination Benefits                            
Segment Reporting Information [Line Items]                            
Production and delivery                         120  
Selling, general and administrative expenses                         5  
Royalty Assessments | Operating Segments | South America | Cerro Verde                            
Segment Reporting Information [Line Items]                            
Production and delivery                       14 (203)  
Interest expense, net                       370 145  
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 income taxes                     (2) (35) 7 (30)
Surface Water Taxes, Papua, Indonesia [Member]                            
Segment Reporting Information [Line Items]                            
Production and delivery $ 28 $ 69                        
Gulf of Mexico Shelf and Madden properties [Member] | Corporate And Eliminations [Member]                            
Segment Reporting Information [Line Items]                            
Net gain on sales of assets                     (20)   (49)  
Onshore California | Corporate And Eliminations [Member]                            
Segment Reporting Information [Line Items]                            
Net gain on sales of assets                       (31)    
Freeport Cobalt                            
Segment Reporting Information [Line Items]                            
Depreciation Expense on Reclassified Assets             $ 48         31    
Freeport Cobalt | Corporate And Eliminations [Member]                            
Segment Reporting Information [Line Items]                            
Depreciation Expense on Reclassified Assets                       31    
Net gain on sales of assets                       (97)    
Timok, Lower Zone [Member]                            
Segment Reporting Information [Line Items]                            
Current Federal Tax Expense (Benefit)                     53      
Cerro Verde Collective Labor Agreement [Member] | Operating Segments | South America | Cerro Verde                            
Segment Reporting Information [Line Items]                            
Production and delivery                       (69)    
PT Freeport Indonesia [Member]                            
Segment Reporting Information [Line Items]                            
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount                     0 (504) 0  
Loss Contingency, Loss in Period, Including Tax Charges                     304      
PT Freeport Indonesia [Member] | Surface Water Taxes, Papua, Indonesia [Member]                            
Segment Reporting Information [Line Items]                            
Loss Contingency, Loss in Period, Including Tax Charges                     28      
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                       76 438  
Minimum Tax Credit Carryforwards [Member] | PT Freeport Indonesia [Member]                            
Segment Reporting Information [Line Items]                            
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount                       (549)    
December 2006 to Tax Year 2013 | Cerro Verde Royalty Dispute | Royalty Assessments | Cerro Verde                            
Segment Reporting Information [Line Items]                            
Provision for income taxes                         (129)  
Judicial Ruling | December 2006 to Tax Year 2013 | Cerro Verde Royalty Dispute | Unfavorable Regulatory Actions                            
Segment Reporting Information [Line Items]                            
Loss Contingency, Loss in Period                         348  
Provision for income taxes                       35 7  
Loss Contingency, Loss in Period, Including Tax Charges                         $ 186  
Tax Authority, In Papau, Indonesia                            
Segment Reporting Information [Line Items]                            
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount                       504    
Tax Authority, In Papau, Indonesia | PT Freeport Indonesia [Member]                            
Segment Reporting Information [Line Items]                            
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount                       $ 482    
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             155      
Interest expense | PT Freeport Indonesia [Member]                            
Segment Reporting Information [Line Items]                            
Loss Contingency, Loss in Period, Including Tax Charges                     78      
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     $ 59