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BUSINESS SEGMENTS INFORMATION (Segment Reporting) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Segment Reporting Information [Line Items]                          
Revenues $ 3,684 $ 4,908 $ 5,168 $ 4,868 $ 5,041 $ 4,310 $ 3,711 $ 3,341   $ 18,628 $ 16,403 $ 14,830  
Production and delivery                   11,691 10,266 10,687  
Cost, Depreciation, Amortization and Depletion                   1,754 1,714 2,530  
Impairment of oil and gas properties                   0 0 4,317  
Metals inventory adjustments     12             4 8 36  
Selling, general and administrative expenses                   443 477 597  
Exploration Expense                   105 93 63  
Environmental obligations and shutdown costs                   89 244 14  
Net gain on sales of assets (82) (70) (45) (11) (15) (33) (10) (23)   (208) (81) (649)  
Change in PT-FI tax rates                   504 0 0  
Operating income (loss) 316 $ 1,315 $ 1,664 $ 1,459 1,479 $ 928 $ 686 $ 597   4,754 3,690 (2,729)  
Interest expense, net                   945 801 755  
Provision for (benefit from) income taxes                   (991) (883) (371)  
Total assets 42,216       37,302         42,216 37,302 37,317 $ 42,216
Payments to Acquire Productive Assets                   1,971 1,410 2,813  
Grasberg Segment [Member]                          
Segment Reporting Information [Line Items]                          
Payments to Acquire Productive Assets                   1,001 875 1,025  
Molybdenum                          
Segment Reporting Information [Line Items]                          
Payments to Acquire Productive Assets                   9 5 2  
South America                          
Segment Reporting Information [Line Items]                          
Payments to Acquire Productive Assets                   237 115 382  
North America copper mines                          
Segment Reporting Information [Line Items]                          
Payments to Acquire Productive Assets                   601 167 102  
Indonesia                          
Segment Reporting Information [Line Items]                          
Revenues                   2,226 2,023 1,402  
Production and delivery 62                        
Operating Segments | Molybdenum                          
Segment Reporting Information [Line Items]                          
Revenues                   0 0 0  
Production and delivery                   289 227 212  
Cost, Depreciation, Amortization and Depletion                   79 76 68  
Impairment of oil and gas properties                       0  
Selling, general and administrative expenses                   0 0 0  
Exploration Expense                   0 0 0  
Environmental obligations and shutdown costs                   0 0 0  
Net gain on sales of assets                   0 0 0  
Operating income (loss)                   42 (35) (94)  
Interest expense, net                   0 0 0  
Provision for (benefit from) income taxes                   0 0 0  
Total assets 1,796       1,858         1,796 1,858 1,934 1,796
Payments to Acquire Productive Assets                   9 5 2  
Operating Segments | Rod & Refining                          
Segment Reporting Information [Line Items]                          
Revenues                   5,103 4,456 3,833  
Production and delivery                   5,117 4,467 3,833  
Cost, Depreciation, Amortization and Depletion                   11 10 10  
Impairment of oil and gas properties                       0  
Selling, general and administrative expenses                   0 0 0  
Exploration Expense                   0 0 0  
Environmental obligations and shutdown costs                   0 0 0  
Net gain on sales of assets                   0 0 0  
Operating income (loss)                   6 5 19  
Interest expense, net                   0 0 0  
Provision for (benefit from) income taxes                   0 0 0  
Total assets 233       277         233 277 220 233
Payments to Acquire Productive Assets                   5 4 1  
Operating Segments | Atlantic Copper Smelting & Refining                          
Segment Reporting Information [Line Items]                          
Revenues                   2,299 2,031 1,825  
Production and delivery                   2,218 1,966 1,712  
Cost, Depreciation, Amortization and Depletion                   27 28 29  
Impairment of oil and gas properties                       0  
Selling, general and administrative expenses                   21 18 17  
Exploration Expense                   0 0 0  
Environmental obligations and shutdown costs                   0 0 0  
Net gain on sales of assets                   0 0 0  
Operating income (loss)                   36 20 72  
Interest expense, net                   25 18 15  
Provision for (benefit from) income taxes                   (1) (5) (9)  
Total assets 773       822         773 822 658 773
Payments to Acquire Productive Assets                   16 41 17  
Operating Segments | North America                          
Segment Reporting Information [Line Items]                          
Revenues                   144 408 684  
Production and delivery                   3,128 2,745 2,914  
Cost, Depreciation, Amortization and Depletion                   360 425 530  
Impairment of oil and gas properties                       0  
Selling, general and administrative expenses                   6 4 5  
Exploration Expense                   3 2 3  
Environmental obligations and shutdown costs                   2 0 0  
Net gain on sales of assets                   0 0 (576)  
Operating income (loss)                   1,195 1,389 1,498  
Interest expense, net                   4 4 4  
Provision for (benefit from) income taxes                   0 0 0  
Total assets 7,530       7,102         7,530 7,102 7,311 7,530
Payments to Acquire Productive Assets                   601 167 102  
Operating Segments | North America | Morenci                          
Segment Reporting Information [Line Items]                          
Revenues                   90 228 444  
Production and delivery                   1,183 1,043 1,162  
Cost, Depreciation, Amortization and Depletion                   176 178 217  
Impairment of oil and gas properties                       0  
Selling, general and administrative expenses                   3 2 2  
Exploration Expense                   0 0 0  
Environmental obligations and shutdown costs                   0 0 0  
Net gain on sales of assets                   0 0 (576)  
Operating income (loss)                   779 870 1,150  
Interest expense, net                   3 3 3  
Provision for (benefit from) income taxes                   0 0 0  
Total assets 2,922       2,861         2,922 2,861 2,863 2,922
Payments to Acquire Productive Assets                   216 114 77  
Operating Segments | North America | Other                          
Segment Reporting Information [Line Items]                          
Revenues                   54 180 240  
Production and delivery                   1,945 1,702 1,752  
Cost, Depreciation, Amortization and Depletion                   184 247 313  
Impairment of oil and gas properties                       0  
Selling, general and administrative expenses                   3 2 3  
Exploration Expense                   3 2 3  
Environmental obligations and shutdown costs                   2 0 0  
Net gain on sales of assets                   0 0 0  
Operating income (loss)                   416 519 348  
Interest expense, net                   1 1 1  
Provision for (benefit from) income taxes                   0 0 0  
Total assets 4,608       4,241         4,608 4,241 4,448 4,608
Payments to Acquire Productive Assets                   385 53 25  
Operating Segments | South America                          
Segment Reporting Information [Line Items]                          
Revenues                   3,303 3,309 2,751  
Production and delivery                   2,365 2,244 1,758  
Cost, Depreciation, Amortization and Depletion                   546 525 553  
Impairment of oil and gas properties                       0  
Selling, general and administrative expenses                   9 9 9  
Exploration Expense                   0 0 0  
Environmental obligations and shutdown costs                   0 0 0  
Net gain on sales of assets                   0 0 0  
Operating income (loss)                   735 916 618  
Interest expense, net                   429 212 82  
Provision for (benefit from) income taxes                   (268) (446) (216)  
Total assets 10,231       10,580         10,231 10,580 10,609 10,231
Payments to Acquire Productive Assets                   237 115 382  
Operating Segments | South America | Cerro Verde                          
Segment Reporting Information [Line Items]                          
Revenues                   2,709 2,811 2,241  
Production and delivery                   1,887 1,878 1,351  
Cost, Depreciation, Amortization and Depletion                   456 441 443  
Impairment of oil and gas properties                       0  
Selling, general and administrative expenses                   9 9 8  
Exploration Expense                   0 0 0  
Environmental obligations and shutdown costs                   0 0 0  
Net gain on sales of assets                   0 0 0  
Operating income (loss)                   709 868 626  
Interest expense, net                   429 212 82  
Provision for (benefit from) income taxes                   (253) (436) (222)  
Total assets 8,524       8,878         8,524 8,878 9,076 8,524
Payments to Acquire Productive Assets                   220 103 380  
Operating Segments | South America | Other                          
Segment Reporting Information [Line Items]                          
Revenues                   594 498 510  
Production and delivery                   478 366 407  
Cost, Depreciation, Amortization and Depletion                   90 84 110  
Impairment of oil and gas properties                       0  
Selling, general and administrative expenses                   0 0 1  
Exploration Expense                   0 0 0  
Environmental obligations and shutdown costs                   0 0 0  
Net gain on sales of assets                   0 0 0  
Operating income (loss)                   26 48 (8)  
Interest expense, net                   0 0 0  
Provision for (benefit from) income taxes                   (15) (10) 6  
Total assets 1,707       1,702         1,707 1,702 1,533 1,707
Payments to Acquire Productive Assets                   17 12 2  
Operating Segments | Indonesia | Grasberg Segment [Member]                          
Segment Reporting Information [Line Items]                          
Revenues                   5,446 4,445 3,233  
Production and delivery                   1,864 1,735 1,775  
Cost, Depreciation, Amortization and Depletion                   606 556 384  
Impairment of oil and gas properties                       0  
Selling, general and administrative expenses                   123 126 88  
Exploration Expense                   0 0 0  
Environmental obligations and shutdown costs                   0 0 0  
Net gain on sales of assets                   0 0 0  
Adjustment to Historical Tax Positions                   20      
Operating income (loss)                   2,966 2,028 1,048  
Interest expense, net                   1 4 0  
Provision for (benefit from) income taxes                   (755) (869) (442)  
Total assets 15,646       10,911         15,646 10,911 10,493 15,646
Payments to Acquire Productive Assets                   1,001 875 1,025  
Corporate And Eliminations [Member]                          
Segment Reporting Information [Line Items]                          
Revenues                   2,333 1,754 2,504  
Production and delivery                   (3,290) (3,118) (1,517)  
Cost, Depreciation, Amortization and Depletion                   125 94 956  
Impairment of oil and gas properties                       4,317  
Selling, general and administrative expenses                   284 320 478  
Exploration Expense                   102 91 60  
Environmental obligations and shutdown costs                   87 244 14  
Net gain on sales of assets                   (208) (81) (73)  
Operating income (loss)                   (226) (633) (5,890)  
Interest expense, net                   486 563 654  
Provision for (benefit from) income taxes                   33 437 296  
Total assets 6,007       $ 5,752         6,007 5,752 6,092 6,007
Payments to Acquire Productive Assets                   102 203 1,284  
Corporate And Eliminations [Member] | United States oil and gas operations                          
Segment Reporting Information [Line Items]                          
Gain (loss) on energy contracts                       35  
Oil and Gas drillship settlements, idle rig credits (costs) and inventory adjustments                       1,000  
Restructuring charges                       (85)  
Capital expenditures                       1,200  
Other Mining & Eliminations                          
Segment Reporting Information [Line Items]                          
Capital expenditures                       73  
Intersegment                          
Segment Reporting Information [Line Items]                          
Revenues                   0 0 0  
Intersegment | Molybdenum                          
Segment Reporting Information [Line Items]                          
Revenues                   410 268 186  
Intersegment | Rod & Refining                          
Segment Reporting Information [Line Items]                          
Revenues                   31 26 29  
Intersegment | Atlantic Copper Smelting & Refining                          
Segment Reporting Information [Line Items]                          
Revenues                   3 1 5  
Intersegment | Corporate And Eliminations [Member]                          
Segment Reporting Information [Line Items]                          
Revenues                   (5,459) (4,837) (4,159)  
Intersegment | North America                          
Segment Reporting Information [Line Items]                          
Revenues                   4,550 4,157 3,690  
Intersegment | North America | Morenci                          
Segment Reporting Information [Line Items]                          
Revenues                   2,051 1,865 1,511  
Intersegment | North America | Other                          
Segment Reporting Information [Line Items]                          
Revenues                   2,499 2,292 2,179  
Intersegment | South America                          
Segment Reporting Information [Line Items]                          
Revenues                   352 385 187  
Intersegment | South America | Cerro Verde                          
Segment Reporting Information [Line Items]                          
Revenues                   352 385 187  
Intersegment | South America | Other                          
Segment Reporting Information [Line Items]                          
Revenues                   0 0 0  
Intersegment | Indonesia | Grasberg Segment [Member]                          
Segment Reporting Information [Line Items]                          
Revenues                   113 0 62  
One-time Termination Benefits | Grasberg Segment [Member]                          
Segment Reporting Information [Line Items]                          
Operating income (loss)                     (125)    
One-time Termination Benefits | Operating Segments | Indonesia | Grasberg Segment [Member]                          
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                     203    
Interest expense, net                     145    
Cerro Verde Royalty Dispute | Operating Segments | South America | Cerro Verde                          
Segment Reporting Information [Line Items]                          
Production and delivery                   14      
Interest expense, net                   370      
Cerro Verde Royalty Dispute | Royalty Assessments | Cerro Verde                          
Segment Reporting Information [Line Items]                          
Production and delivery                   14 203   217
Interest expense, net                   370 145   515
Provision for (benefit from) income taxes                   35 (7)   28
Kisanfu Exploration Project | Corporate And Eliminations [Member]                          
Segment Reporting Information [Line Items]                          
Net gain on sales of assets                     (13)    
Deepwater Gulf of Mexico and Onshore California Oil And Gas Properties [Member] | Corporate And Eliminations [Member]                          
Segment Reporting Information [Line Items]                          
Net gain on sales of assets                     (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]                          
Operating income (loss)                   50      
Total assets 494                 494     $ 494
Freeport Cobalt | Corporate And Eliminations [Member]                          
Segment Reporting Information [Line Items]                          
Net gain on sales of assets                   (97)      
Depreciation Expense on Reclassified Assets $ 48                 31      
Cerro Verde Collective Labor Agreement [Member] | Operating Segments | South America | Cerro Verde                          
Segment Reporting Information [Line Items]                          
Production and delivery                 $ (69) (69)      
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    
Tax Authority, In Papau, Indonesia                          
Segment Reporting Information [Line Items]                          
Change in PT-FI tax rates                   $ 504      
Accounting Standards Update 2017-05 [Member] | Restatement Adjustment                          
Segment Reporting Information [Line Items]                          
Production and delivery                     (42) (46)  
Selling, general and administrative expenses                     (7) (10)  
Exploration Expense                     (1) (1)  
Environmental obligations and shutdown costs                     (7) (6)  
Operating income (loss)                     $ 57 $ 63