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Business Segments (Segment Reporting) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
segment
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Segment Reporting Information [Line Items]      
Number of Operating Segments | segment 4    
Deferred Intercompany Profit, Percentage 25.00%    
Revenues $ 4,850 $ 2,798  
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31) (2,786) (2,545)  
Cost, Depreciation, Amortization and Depletion 419 341  
Metals inventory adjustments 1 222  
Selling, general and administrative expenses (100) (110)  
Mining exploration and research expenses 7 16  
Environmental obligations and shutdown costs 5 26  
Net gain on sales of assets 0 11  
Operating income (loss) 1,532 (473)  
Interest expense, net 145 127  
Provision for (benefit from) income taxes 443 (60)  
Total assets 43,643 40,219 $ 42,144
Capital expenditures 370 610  
Operating Segments | North America      
Segment Reporting Information [Line Items]      
Revenues 32 9  
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31) (749) (860)  
Cost, Depreciation, Amortization and Depletion 80 92  
Metals inventory adjustments 0 145  
Selling, general and administrative expenses (1) (1)  
Mining exploration and research expenses 0 1  
Environmental obligations and shutdown costs 0 0  
Net gain on sales of assets   0  
Operating income (loss) 508 (114)  
Interest expense, net 0 1  
Provision for (benefit from) income taxes 0 0  
Total assets 7,912 7,907  
Capital expenditures 26 184  
Operating Segments | South America      
Segment Reporting Information [Line Items]      
Revenues 1,092 474  
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31) (539) (534)  
Cost, Depreciation, Amortization and Depletion 101 108  
Metals inventory adjustments 0 60  
Selling, general and administrative expenses (2) (2)  
Mining exploration and research expenses 0 0  
Environmental obligations and shutdown costs 0 0  
Net gain on sales of assets   0  
Operating income (loss) 495 (192)  
Interest expense, net 13 28  
Provision for (benefit from) income taxes 194 (78)  
Total assets 10,461 10,126  
Capital expenditures 21 74  
Corporate And Eliminations      
Segment Reporting Information [Line Items]      
Revenues 347 326  
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31) 1,003 788  
Cost, Depreciation, Amortization and Depletion 16 15  
Metals inventory adjustments 0 13  
Selling, general and administrative expenses (64) (74)  
Mining exploration and research expenses 7 15  
Environmental obligations and shutdown costs 5 25  
Net gain on sales of assets   11  
Operating income (loss) (222) (143)  
Interest expense, net 130 94  
Provision for (benefit from) income taxes (66) 6  
Total assets 4,734 2,821  
Capital expenditures 5 11  
Intersegment      
Segment Reporting Information [Line Items]      
Revenues 0 0  
Intersegment | North America      
Segment Reporting Information [Line Items]      
Revenues 1,306 976  
Intersegment | South America      
Segment Reporting Information [Line Items]      
Revenues 45 38  
PT Smelting | Affiliated Entity [Member]      
Segment Reporting Information [Line Items]      
Revenues 792 380  
Morenci [Member] | Operating Segments | North America      
Segment Reporting Information [Line Items]      
Revenues 4 2  
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31) (269) (349)  
Cost, Depreciation, Amortization and Depletion 34 44  
Metals inventory adjustments 0 4  
Selling, general and administrative expenses 0 (1)  
Mining exploration and research expenses 0 0  
Environmental obligations and shutdown costs 0 0  
Net gain on sales of assets   0  
Operating income (loss) 265 46  
Interest expense, net 0 1  
Provision for (benefit from) income taxes 0 0  
Total assets 2,629 2,814  
Capital expenditures 10 44  
Morenci [Member] | Intersegment | North America      
Segment Reporting Information [Line Items]      
Revenues 564 442  
Other Mines North America Copper Mines Segment [Member] | Operating Segments | North America      
Segment Reporting Information [Line Items]      
Metals inventory adjustments   141  
Other Individually Immaterial Operating Segments [Member] | Operating Segments | North America      
Segment Reporting Information [Line Items]      
Revenues 28 7  
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31) (480) (511)  
Cost, Depreciation, Amortization and Depletion 46 48  
Metals inventory adjustments 0    
Selling, general and administrative expenses (1) 0  
Mining exploration and research expenses 0 1  
Environmental obligations and shutdown costs 0 0  
Net gain on sales of assets   0  
Operating income (loss) 243 (160)  
Interest expense, net 0 0  
Provision for (benefit from) income taxes 0 0  
Total assets 5,283 5,093  
Capital expenditures 16 140  
Other Individually Immaterial Operating Segments [Member] | Operating Segments | South America      
Segment Reporting Information [Line Items]      
Revenues 175 98  
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31) (103) (110)  
Cost, Depreciation, Amortization and Depletion 12 15  
Metals inventory adjustments 0 60  
Selling, general and administrative expenses 0 0  
Mining exploration and research expenses 0 0  
Environmental obligations and shutdown costs 0 0  
Net gain on sales of assets   0  
Operating income (loss) 60 (87)  
Interest expense, net 0 0  
Provision for (benefit from) income taxes 21 (26)  
Total assets 1,738 1,655  
Capital expenditures 1 15  
Other Individually Immaterial Operating Segments [Member] | Intersegment | North America      
Segment Reporting Information [Line Items]      
Revenues 742 534  
Other Individually Immaterial Operating Segments [Member] | Intersegment | South America      
Segment Reporting Information [Line Items]      
Revenues 0 0  
Cerro Verde [Member] | Operating Segments | South America      
Segment Reporting Information [Line Items]      
Revenues 917 376  
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31) (436) (424)  
Cost, Depreciation, Amortization and Depletion 89 93  
Metals inventory adjustments 0 0  
Selling, general and administrative expenses (2) (2)  
Mining exploration and research expenses 0 0  
Environmental obligations and shutdown costs 0 0  
Net gain on sales of assets   0  
Operating income (loss) 435 (105)  
Interest expense, net 13 28  
Provision for (benefit from) income taxes 173 (52)  
Total assets 8,723 8,471  
Capital expenditures 20 59  
Cerro Verde [Member] | Intersegment | South America      
Segment Reporting Information [Line Items]      
Revenues 45 38  
Grasberg Segment [Member]      
Segment Reporting Information [Line Items]      
Capital expenditures 310 326  
Grasberg Segment [Member] | Operating Segments | Indonesia      
Segment Reporting Information [Line Items]      
Revenues 1,383 445  
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31) (455) (343)  
Cost, Depreciation, Amortization and Depletion 199 101  
Metals inventory adjustments 0 0  
Selling, general and administrative expenses (26) (28)  
Mining exploration and research expenses 0 0  
Environmental obligations and shutdown costs 0 0  
Net gain on sales of assets   0  
Operating income (loss) 755 (27)  
Interest expense, net 1 1  
Provision for (benefit from) income taxes 315 12  
Total assets 17,551 16,711  
Capital expenditures 310 326  
Grasberg Segment [Member] | Intersegment | Indonesia      
Segment Reporting Information [Line Items]      
Revenues 52 0  
Molybdenum      
Segment Reporting Information [Line Items]      
Capital expenditures 1 7  
Molybdenum | Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 0 0  
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31) (57) (66)  
Cost, Depreciation, Amortization and Depletion 15 16  
Metals inventory adjustments 1 4  
Selling, general and administrative expenses 0 0  
Mining exploration and research expenses 0 0  
Environmental obligations and shutdown costs 0 0  
Net gain on sales of assets   0  
Operating income (loss) (3) (15)  
Interest expense, net 0 0  
Provision for (benefit from) income taxes 0 0  
Total assets 1,753 1,788  
Capital expenditures 1 7  
Molybdenum | Intersegment      
Segment Reporting Information [Line Items]      
Revenues 70 71  
Rod and Refining Segment [Member] | Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 1,309 1,115  
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31) (1,316) (1,119)  
Cost, Depreciation, Amortization and Depletion 1 2  
Metals inventory adjustments 0 0  
Selling, general and administrative expenses 0 0  
Mining exploration and research expenses 0 0  
Environmental obligations and shutdown costs 0 1  
Net gain on sales of assets   0  
Operating income (loss) (1) 1  
Interest expense, net 0 0  
Provision for (benefit from) income taxes 0 0  
Total assets 235 231  
Capital expenditures 1 2  
Rod and Refining Segment [Member] | Intersegment      
Segment Reporting Information [Line Items]      
Revenues 7 8  
Atlantic Copper Smelting and Refining Segment [Member] | Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 687 429  
Cost of Goods Sold, Excluding Depreciation, Depletion, and Amortization (Deprecated 2019-01-31) (673) (411)  
Cost, Depreciation, Amortization and Depletion 7 7  
Metals inventory adjustments 0 0  
Selling, general and administrative expenses (7) (5)  
Mining exploration and research expenses 0 0  
Environmental obligations and shutdown costs 0 0  
Net gain on sales of assets   0  
Operating income (loss) 0 17  
Interest expense, net 1 3  
Provision for (benefit from) income taxes 0 0  
Total assets 997 635  
Capital expenditures 6 6  
Atlantic Copper Smelting and Refining Segment [Member] | Intersegment      
Segment Reporting Information [Line Items]      
Revenues 0 11  
Corporate And Eliminations | Intersegment      
Segment Reporting Information [Line Items]      
Revenues (1,480) $ (1,104)  
Miami smelter | Corporate And Eliminations      
Segment Reporting Information [Line Items]      
Cost, Maintenance $ 68