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Business Segments (Segment Reporting) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]          
Number of Operating Segments | segment     4    
Revenues $ 5,168 $ 3,711 $ 10,036 $ 7,052  
Production and delivery 2,915 2,480 5,723 4,668  
Depreciation, depletion and amortization 442 450 893 839  
Selling, general and administrative expenses 109 107 240 258  
Mining exploration and research expenses 24 19 45 33  
Environmental obligations and shutdown costs 59 (21) 68 4  
Net gain on sales of assets (45) (10) (56) (33)  
Operating income (loss) 1,664 686 3,123 1,283  
Interest expense, net 142 162 293 329  
Provision for (benefit from) income taxes 515 186 1,021 360  
Total assets 37,028 37,043 37,028 37,043 $ 37,302
Capital expenditures 482 362 884 706  
Assets held for sale 625 373 625 373 $ 508
Operating Segments | North America          
Segment Reporting Information [Line Items]          
Revenues 38 77 56 193  
Production and delivery 789 720 1,580 1,386  
Depreciation, depletion and amortization 92 118 186 234  
Selling, general and administrative expenses 1 1 4 2  
Mining exploration and research expenses 0 1 1 2  
Environmental obligations and shutdown costs 0 0 0 0  
Net gain on sales of assets 0 0 0 0  
Operating income (loss) 365 308 784 619  
Interest expense, net 1 1 2 2  
Provision for (benefit from) income taxes 0 0 0 0  
Total assets 7,193 7,144 7,193 7,144  
Capital expenditures 140 39 232 67  
Operating Segments | South America          
Segment Reporting Information [Line Items]          
Revenues 890 678 1,665 1,430  
Production and delivery 578 463 1,121 936  
Depreciation, depletion and amortization 133 125 260 258  
Selling, general and administrative expenses 2 3 4 5  
Mining exploration and research expenses 0 0 0 0  
Environmental obligations and shutdown costs 0 0 0 0  
Net gain on sales of assets 0 0 0 0  
Operating income (loss) 277 144 482 404  
Interest expense, net 16 15 33 31  
Provision for (benefit from) income taxes 108 58 180 159  
Total assets 10,345 10,307 10,345 10,307  
Capital expenditures 71 30 138 45  
Corporate And Eliminations [Member]          
Segment Reporting Information [Line Items]          
Revenues 612 445 1,204 819  
Production and delivery (916) (755) (1,910) (1,573)  
Depreciation, depletion and amortization 14 25 35 54  
Selling, general and administrative expenses 73 69 154 182  
Mining exploration and research expenses 24 18 44 31  
Environmental obligations and shutdown costs 59 (21) 68 4  
Net gain on sales of assets (45) (10) (56) (33)  
Operating income (loss) (26) (86) (109) (217)  
Interest expense, net 119 142 247 288  
Provision for (benefit from) income taxes (22) (9) 10 (4)  
Total assets 5,550 5,931 5,550 5,931  
Capital expenditures 20 61 54 108  
Intersegment          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Intersegment | North America          
Segment Reporting Information [Line Items]          
Revenues 1,209 1,071 2,499 2,050  
Intersegment | South America          
Segment Reporting Information [Line Items]          
Revenues 100 57 202 173  
Pt Smelting [Member] | Affiliated Entity [Member]          
Segment Reporting Information [Line Items]          
Revenues 649 536 $ 1,300 794  
Pt Smelting [Member]          
Segment Reporting Information [Line Items]          
Deferred Intercompany Profit, Percentage     25.00%    
Morenci [Member] | Operating Segments | North America          
Segment Reporting Information [Line Items]          
Revenues 25 45 $ 28 111  
Production and delivery 298 266 588 523  
Depreciation, depletion and amortization 44 49 90 96  
Selling, general and administrative expenses 1 1 2 1  
Mining exploration and research expenses 0 0 0 0  
Environmental obligations and shutdown costs 0 0 0 0  
Net gain on sales of assets 0 0 0 0  
Operating income (loss) 250 207 517 385  
Interest expense, net 1 0 2 1  
Provision for (benefit from) income taxes 0 0 0 0  
Total assets 2,819 2,830 2,819 2,830  
Capital expenditures 41 29 88 52  
Morenci [Member] | Intersegment | North America          
Segment Reporting Information [Line Items]          
Revenues 568 478 1,169 894  
Other Individually Immaterial Operating Segments [Member] | Operating Segments | North America          
Segment Reporting Information [Line Items]          
Revenues 13 32 28 82  
Production and delivery 491 454 992 863  
Depreciation, depletion and amortization 48 69 96 138  
Selling, general and administrative expenses 0 0 2 1  
Mining exploration and research expenses 0 1 1 2  
Environmental obligations and shutdown costs 0 0 0 0  
Net gain on sales of assets 0 0 0 0  
Operating income (loss) 115 101 267 234  
Interest expense, net 0 1 0 1  
Provision for (benefit from) income taxes 0 0 0 0  
Total assets 4,374 4,314 4,374 4,314  
Capital expenditures 99 10 144 15  
Other Individually Immaterial Operating Segments [Member] | Operating Segments | South America          
Segment Reporting Information [Line Items]          
Revenues 171 111 321 223  
Production and delivery 133 87 249 169  
Depreciation, depletion and amortization 24 21 46 42  
Selling, general and administrative expenses 0 0 0 0  
Mining exploration and research expenses 0 0 0 0  
Environmental obligations and shutdown costs 0 0 0 0  
Net gain on sales of assets 0 0 0 0  
Operating income (loss) 14 3 26 12  
Interest expense, net 0 0 0 0  
Provision for (benefit from) income taxes 6 2 10 5  
Total assets 1,715 1,479 1,715 1,479  
Capital expenditures 3 1 7 2  
Other Individually Immaterial Operating Segments [Member] | Intersegment | North America          
Segment Reporting Information [Line Items]          
Revenues 641 593 1,330 1,156  
Other Individually Immaterial Operating Segments [Member] | Intersegment | South America          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Cerro Verde [Member] | Operating Segments | South America          
Segment Reporting Information [Line Items]          
Revenues 719 567 1,344 1,207  
Production and delivery 445 376 872 767  
Depreciation, depletion and amortization 109 104 214 216  
Selling, general and administrative expenses 2 3 4 5  
Mining exploration and research expenses 0 0 0 0  
Environmental obligations and shutdown costs 0 0 0 0  
Net gain on sales of assets 0 0 0 0  
Operating income (loss) 263 141 456 392  
Interest expense, net 16 15 33 31  
Provision for (benefit from) income taxes 102 56 170 154  
Total assets 8,630 8,828 8,630 8,828  
Capital expenditures 68 29 131 43  
Cerro Verde [Member] | Intersegment | South America          
Segment Reporting Information [Line Items]          
Revenues 100 57 202 173  
Grasberg Segment [Member]          
Segment Reporting Information [Line Items]          
Capital expenditures     449 457  
Grasberg Segment [Member] | Operating Segments | Indonesia          
Segment Reporting Information [Line Items]          
Revenues 1,639 1,065 3,160 1,599  
Production and delivery 425 547 882 817  
Depreciation, depletion and amortization 172 153 353 236  
Selling, general and administrative expenses 28 30 67 60  
Mining exploration and research expenses 0 0 0 0  
Environmental obligations and shutdown costs 0 0 0 0  
Net gain on sales of assets 0 0 0 0  
Operating income (loss) 1,015 335 1,911 486  
Interest expense, net 0 0 0 0  
Provision for (benefit from) income taxes 429 135 830 202  
Total assets 10,911 10,769 10,911 10,769  
Capital expenditures 246 213 449 457  
Grasberg Segment [Member] | Intersegment | Indonesia          
Segment Reporting Information [Line Items]          
Revenues 1 0 53 0  
Molybdenum [Member]          
Segment Reporting Information [Line Items]          
Capital expenditures     2 2  
Molybdenum [Member] | Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 0 0 0 0  
Production and delivery 71 58 138 110  
Depreciation, depletion and amortization 21 19 40 38  
Selling, general and administrative expenses 0 0 0 0  
Mining exploration and research expenses 0 0 0 0  
Environmental obligations and shutdown costs 0 0 0 0  
Net gain on sales of assets 0 0 0 0  
Operating income (loss) 19 (6) 28 (14)  
Interest expense, net 0 0 0 0  
Provision for (benefit from) income taxes 0 0 0 0  
Total assets 1,820 1,900 1,820 1,900  
Capital expenditures 1 1 2 2  
Molybdenum [Member] | Intersegment          
Segment Reporting Information [Line Items]          
Revenues 111 71 206 134  
Rod and Refining Segment [Member] | Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 1,387 1,046 2,772 2,153  
Production and delivery 1,389 1,047 2,777 2,156  
Depreciation, depletion and amortization 3 3 5 5  
Selling, general and administrative expenses 0 0 0 0  
Mining exploration and research expenses 0 0 0 0  
Environmental obligations and shutdown costs 0 0 0 0  
Net gain on sales of assets 0 0 0 0  
Operating income (loss) 3 2 6 6  
Interest expense, net 0 0 0 0  
Provision for (benefit from) income taxes 0 0 0 0  
Total assets 278 253 278 253  
Capital expenditures 1 1 2 2  
Rod and Refining Segment [Member] | Intersegment          
Segment Reporting Information [Line Items]          
Revenues 8 6 16 14  
Atlantic Copper Smelting and Refining Segment [Member] | Operating Segments          
Segment Reporting Information [Line Items]          
Revenues 602 400 1,179 858  
Production and delivery 579 400 1,135 836  
Depreciation, depletion and amortization 7 7 14 14  
Selling, general and administrative expenses 5 4 11 9  
Mining exploration and research expenses 0 0 0 0  
Environmental obligations and shutdown costs 0 0 0 0  
Net gain on sales of assets 0 0 0 0  
Operating income (loss) 11 (11) 21 (1)  
Interest expense, net 6 4 11 8  
Provision for (benefit from) income taxes 0 2 1 3  
Total assets 931 739 931 739  
Capital expenditures 3 17 7 25  
Atlantic Copper Smelting and Refining Segment [Member] | Intersegment          
Segment Reporting Information [Line Items]          
Revenues 0 0 2 0  
Corporate And Eliminations [Member] | Intersegment          
Segment Reporting Information [Line Items]          
Revenues $ (1,429) (1,205) $ (2,978) (2,371)  
Restatement Adjustment [Member] | Accounting Standards Update 2017-05 [Member]          
Segment Reporting Information [Line Items]          
Production and delivery   (15)   (27)  
Selling, general and administrative expenses       (2)  
Mining exploration and research expenses       (1)  
Environmental obligations and shutdown costs   (2)   (4)  
Operating income (loss)   17   34  
One-time Termination Benefits [Member] | Grasberg Segment [Member] | Operating Segments | Indonesia          
Segment Reporting Information [Line Items]          
Production and delivery   (82)   (103)  
Selling, general and administrative expenses   $ (5)   $ (5)