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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Footnotes) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
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
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  | $ (50) | $ (292) | $ (274) |
Production and delivery |  |  |  |  |  |  |  |  | 11,514 | 11,687 | 10,258 |
Interest expense, net |  |  |  |  |  |  |  |  | (620) | (945) | (801) |
Metals inventory adjustments | $ 79 | $ 41 | $ 59 |  |  |  |  |  | 179 | 4 | 8 |
Net Income (Loss) From Continuing Operations, Inventory Write-down |  |  |  |  |  |  |  |  | $ 144 |  |  |
Net Income (Loss) From Continuing Operations, Inventory Write-Down, Per Share |  |  |  |  |  |  |  |  | $ 0.10 |  |  |
Environmental obligations and shutdown costs |  | 19 |  | $ 35 |  |  |  |  | $ 68 |  |  |
Net gain on sales of assets |  |  |  |  | $ 82 | $ 70 | $ 45 | $ 11 | 417 | $ 208 | 81 |
Gain (Loss) on Disposition of Assets, Common Shareholder |  |  |  |  |  |  |  |  | $ (339) |  |  |
Net gains on sales of assets (usd per share) |  |  |  |  |  |  |  |  | $ 0.23 | $ 0.14 |  |
Income Tax Credits and Adjustments |  |  |  |  |  |  |  |  |  | $ 632 |  |
Income Tax Credits and Adjustments, Net of Noncontrolling Interest |  |  |  |  |  |  |  |  |  | $ 574 |  |
Earnings per share attributable to common stockholders related to Tax Reform (usd per share) |  |  |  |  |  |  |  |  |  | $ 0.39 |  |
Change in PT-FI tax rates |  |  |  |  |  |  |  |  | $ 0 | $ 504 | 0 |
Tax Cuts and Jobs Act of 2017, provisional income tax expense (benefit) |  |  |  |  |  |  |  |  | 0 | 123 | 393 |
Operating income (loss) | (775) | 38 | (33) | $ (321) | (316) | $ (1,315) | (1,664) | $ (1,459) | (1,091) | (4,754) | (3,690) |
Extinguishment of Debt, Gain (Loss), Net of Tax |  |  |  |  |  |  |  |  | $ 26 |  |  |
Extinguishment of Debt, Gain (Loss), Per Share, Net of Tax |  |  |  |  |  |  |  |  | $ 0.02 |  |  |
Freeport Cobalt |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation Expense on Reclassified Assets |  |  |  |  | (48) |  |  |  |  | (31) |  |
PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in PT-FI tax rates |  |  |  |  |  |  |  |  | $ 0 | 504 | 0 |
Production and Delivery Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Environmental obligations and shutdown costs |  | 15 |  |  |  |  |  |  |  |  |  |
Operating Expense [Member] | Freeport Cobalt |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | $ (30) |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.02 |  |
Operating income (loss) |  |  |  |  |  |  |  |  |  | $ 50 |  |
Cerro Verde |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Loss in Period |  |  |  |  |  |  |  |  | 16 |  |  |
PT-FI charges [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Loss in Period | 266 |  |  |  |  |  |  |  | 460 | 223 |  |
Loss contingency, loss In period, attributable to parent |  |  |  |  |  |  |  |  | $ 379 | $ 110 |  |
Gain (loss) in period, per share (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.26) | $ (0.08) |  |
Inventory Adjustment |  |  |  |  | 43 |  | $ 12 |  |  |  |  |
PT-FI charges [Member] | Interest expense | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Loss in Period | $ 78 |  |  |  |  |  |  |  |  |  |  |
PT-FI charges [Member] | Other Expense [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  | $ 188 |  |  |
PT-FI charges [Member] | Sales [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations attributable to noncontrolling interests |  | $ 166 |  |  |  |  |  |  |  |  |  |
PT-FI charges [Member] | Production and Delivery Costs [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations attributable to noncontrolling interests |  |  | $ 28 |  |  |  |  |  |  |  |  |
Loss Contingency, Offer to Other Party |  |  |  |  | 69 |  |  |  |  |  |  |
Permit Fees |  |  |  |  | 32 |  |  |  |  |  |  |
Payroll withholding taxes |  |  |  |  | 72 |  |  |  |  | $ 72 |  |
Cerro Verde Royalty Dispute | Royalty Assessments | Cerro Verde |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, loss In period, attributable to parent |  |  |  |  |  |  |  |  | 7 | $ 195 | 186 | $ 388
Gain (loss) in period, per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.13) |  |
Net income from continuing operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 7 | $ 176 | 169 | 352
Production and delivery |  |  |  |  |  |  |  |  | 6 | 14 | 203 | 223
Interest expense, net |  |  |  |  |  |  |  |  | (10) | (370) | (145) | (525)
Other expense |  |  |  |  |  |  |  |  | $ 0 | (22) | 0 | $ (22)
Minimum Tax Credit Carryforwards [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in PT-FI tax rates |  |  |  |  |  |  |  |  |  | 549 |  |
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) |  |  |  |  |  |  |  |  | $ 0.05 | $ 0.04 |  |
Environmental obligations and shutdown costs |  |  |  |  |  |  |  |  |  | $ 57 |  |
Indonesia |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods and Services Sold |  |  |  |  | $ 62 |  |  |  |  |  |  |
Operating Segments | South America |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  |  |  |  |  | $ 2,326 | 2,365 | 2,244 |
Interest expense, net |  |  |  |  |  |  |  |  | (114) | (429) | (212) |
Metals inventory adjustments |  |  |  |  |  |  |  |  | 2 | 0 | 0 |
Net gain on sales of assets |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating income (loss) |  |  |  |  |  |  |  |  | (578) | (735) | (916) |
Operating Segments | South America | Cerro Verde |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  |  |  |  |  | 1,852 | 1,887 | 1,878 |
Interest expense, net |  |  |  |  |  |  |  |  | (114) | (429) | (212) |
Metals inventory adjustments |  |  |  |  |  |  |  |  | 2 | 0 | 0 |
Net gain on sales of assets |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating income (loss) |  |  |  |  |  |  |  |  | (621) | (709) | (868) |
Operating Segments | Indonesia | Grasberg Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Loss in Period |  |  |  |  |  |  |  |  |  | 223 |  |
Production and delivery |  |  |  |  |  |  |  |  | 2,055 | 1,864 | 1,735 |
Interest expense, net |  |  |  |  |  |  |  |  | (82) | (1) | (4) |
Metals inventory adjustments |  |  |  |  |  |  |  |  | 5 | 0 | 0 |
Net gain on sales of assets |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Operating income (loss) |  |  |  |  |  |  |  |  | $ (180) | (2,966) | $ (2,028) |
Tax Authority, In Papau, Indonesia |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in PT-FI tax rates |  |  |  |  |  |  |  |  |  | (504) |  |
Tax Authority, In Papau, Indonesia | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in PT-FI tax rates |  |  |  |  |  |  |  |  |  | $ (482) |  |
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) |  |
Cost of Goods Sold, Excluding Depreciation, Depletion and Amortization, Net of Noncontrolling Interest |  |  |  |  |  |  |  |  |  | (22) |  |
Cost of Goods and Services Sold |  |  |  |  |  |  |  |  |  | $ 69 |  |

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