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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Footnotes) (Details) - USD ($) $ / shares in Units, $ 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
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  |  |  |  |  |  | $ (11,691) | $ (10,266) | $ (10,687) |
Interest expense, net |  |  |  |  |  |  |  |  |  | (945) | (801) | (755) |
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  |  | 991 | 883 | 371 |
Net income from continuing operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | (292) | (274) | (227) |
Payroll withholding taxes | $ 72 |  |  |  |  |  |  |  |  | 72 |  |  | $ 72
Metals inventory adjustments |  |  | $ 12 |  |  |  |  |  |  | 4 | 8 | 36 |
Environmental obligations and shutdown costs |  |  |  |  |  |  |  |  |  | 57 |  |  |
Net gain on sales of assets | 82 | $ 70 | 45 | $ 11 | $ 15 | $ 33 | $ 10 | $ 23 |  | $ 208 | $ 81 | 649 |
Net gains on sales of assets (usd per share) |  |  |  |  |  |  |  |  |  | $ 0.14 | $ 0.06 |  |
Income Tax Credits and Adjustments, Net of Noncontrolling Interest |  |  |  |  |  |  |  |  |  | $ 574 |  |  |
Income Tax Credits and Adjustments, Net of Noncontrolling Interests, Per Share |  |  |  |  |  |  |  |  |  | $ 0.39 |  |  |
Earnings per share attributable to common stockholders related to Tax Reform (usd per share) |  |  |  |  |  |  |  |  |  |  | $ 0.30 |  |
Change in PT-FI tax rates |  |  |  |  |  |  |  |  |  | $ 504 | $ 0 | 0 |
Tax Cuts and Jobs Act of 2017, provisional income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (123) | (393) | 0 |
Operating income (loss) | 316 | $ 1,315 | $ 1,664 | $ 1,459 | 1,479 | 928 | 686 | 597 |  | $ 4,754 | 3,690 | (2,729) |
Freeport Cobalt |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.02 |  |  |
Net income from continuing operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | $ (30) |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  | 50 |  |  |
PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Metals inventory adjustments | 43 |  |  |  |  |  |  |  |  |  |  |  |
Cerro Verde Royalty Dispute | Royalty Assessments | Cerro Verde |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, loss In period, attributable to parent |  |  |  |  |  |  |  |  |  | $ (195) | $ (186) |  | (381)
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.13) | $ 0.13 |  |
Production and delivery |  |  |  |  |  |  |  |  |  | $ (14) | $ (203) |  | (217)
Interest expense, net |  |  |  |  |  |  |  |  |  | (370) | (145) |  | (515)
Other expense |  |  |  |  |  |  |  |  |  | (22) | 0 |  | (22)
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  |  | (35) | 7 |  | (28)
Net income from continuing operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 176 | $ 169 |  | $ 345
One-time Termination Benefits | Grasberg Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.04 |  |
Net income from continuing operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  | $ 66 |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | (125) |  |
One-time Termination Benefits | Grasberg Segment [Member] | Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  | 8 | 9 | 87 | 21 |  |  |  |  |
Minimum Tax Credit Carryforwards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Credits and Adjustments |  |  |  |  |  |  |  |  |  | 632 |  |  |
Federal Income Tax Expense (Benefit), Continuing Operations |  |  |  |  |  |  |  |  |  | 76 | $ 438 |  |
MOEF Framework |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Permit Fees |  |  |  |  |  |  |  |  |  | $ 32 |  |  |
Site Remediation, Reclamation and Closure Costs |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.04 | $ 0.14 |  |
Environmental obligations and shutdown costs |  |  |  |  | $ 157 | $ 64 | $ (30) | $ 19 |  |  | $ 210 |  |
Indonesia |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery | (62) |  |  |  |  |  |  |  |  |  |  |  |
Operating Segments | South America |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  |  |  |  |  |  | $ (2,365) | (2,244) | (1,758) |
Interest expense, net |  |  |  |  |  |  |  |  |  | (429) | (212) | (82) |
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  |  | 268 | 446 | 216 |
Net gain on sales of assets |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating income (loss) |  |  |  |  |  |  |  |  |  | 735 | 916 | 618 |
Operating Segments | South America | Cerro Verde |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  |  |  |  |  |  | (1,887) | (1,878) | (1,351) |
Interest expense, net |  |  |  |  |  |  |  |  |  | (429) | (212) | (82) |
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  |  | 253 | 436 | 222 |
Net gain on sales of assets |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating income (loss) |  |  |  |  |  |  |  |  |  | 709 | 868 | 626 |
Operating Segments | South America | Cerro Verde Royalty Dispute | Cerro Verde |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  |  |  |  |  |  | (14) |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | (370) |  |  |
Other expense |  |  |  |  |  |  |  |  |  | (22) |  |  |
Operating Segments | Indonesia | Grasberg Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, loss In period, attributable to parent |  |  |  |  |  |  |  |  |  | $ (110) |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.08 |  |  |
Production and delivery |  |  |  |  |  |  |  |  |  | $ (1,864) | (1,735) | (1,775) |
Interest expense, net |  |  |  |  |  |  |  |  |  | (1) | (4) | 0 |
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  |  | 755 | 869 | 442 |
Loss Contingency, Loss in Period |  |  |  |  |  |  |  |  |  | 223 |  |  |
Net gain on sales of assets |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating income (loss) |  |  |  |  |  |  |  |  |  | 2,966 | 2,028 | 1,048 |
Operating Segments | Indonesia | One-time Termination Benefits | Grasberg Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  |  |  |  |  |  |  | (120) |  |
Corporate And Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  |  |  |  |  |  | 3,290 | 3,118 | 1,517 |
Interest expense, net |  |  |  |  |  |  |  |  |  | (486) | (563) | (654) |
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  |  | (33) | (437) | (296) |
Net gain on sales of assets |  |  |  |  |  |  |  |  |  | 208 | 81 | 73 |
Operating income (loss) |  |  |  |  |  |  |  |  |  | (226) | $ (633) | $ (5,890) |
Corporate And Eliminations [Member] | Freeport Cobalt |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain on sales of assets |  |  |  |  |  |  |  |  |  | 97 |  |  |
Depreciation Expense on Reclassified Assets | $ (48) |  |  |  |  |  |  |  |  | (31) |  |  |
Tax Authority, In Papau, Indonesia |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Change in PT-FI tax rates |  |  |  |  |  |  |  |  |  | 504 |  |  |
Tax Authority, In Papau, Indonesia | Penalties | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Offer to Other Party |  |  |  |  |  |  |  |  |  | $ 69 |  |  |
Cerro Verde Collective Labor Agreement [Member] | Operating Segments | South America | Cerro Verde |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.02) |  |  |
Production and delivery |  |  |  |  |  |  |  |  | $ 69 | $ 69 |  |  |
Cost of Goods Sold, Excluding Depreciation, Depletion and Amortization, Net of Noncontrolling Interest |  |  |  |  |  |  |  |  |  | $ 22 |  |  |

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