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Contingencies and Commitments (Unaudited) - Tax and Other Matters (Details) T in Thousands, $ in Millions, Rp in Billions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 13 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2021 USD ($) | Feb. 28, 2021 IDR (Rp) | Oct. 31, 2019 USD ($) | Oct. 31, 2019 IDR (Rp) | May 31, 2019 USD ($) | May 31, 2019 IDR (Rp) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Mar. 08, 2020 T | Jan. 01, 2023 | Mar. 31, 2019 | Dec. 21, 2018
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  |  |  | $ 2,665 |  | $ 3,069 | $ 8,584 | $ 8,790 |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentrate, export quota, original | T |  |  |  |  |  |  |  |  |  |  |  |  | 180 |  |  |
Concentrate, export quota, revised | T |  |  |  |  |  |  |  |  |  |  |  |  | 680 |  |  |
Surface Water Taxes, Papua, Indonesia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Production and delivery |  |  |  |  |  |  |  | $ 28 |  |  |  |  |  |  |  |
Surface Water Taxes, Papua, Indonesia | PT Freeport Indonesia | Annual surface water tax payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for taxes |  |  |  |  |  |  |  |  |  | $ 15 |  |  |  |  |  |
Surface Water Taxes, Papua, Indonesia | PT Freeport Indonesia | Tax Authority, In Papau, Indonesia | Penalties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, agreed to pay |  |  |  |  | $ 99 | Rp 1,394.0 |  |  |  |  |  |  |  |  |  |
Loss contingency, offer |  |  |  |  |  |  |  |  |  |  |  | $ 69 |  |  |  |
Surface Water Taxes, Papua, Indonesia | PT Freeport Indonesia | Tax Authority, In Papau, Indonesia | Penalties | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for legal settlements | $ 49 | Rp 685.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
PT Freeport Indonesia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment owned, percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 81.00%
PT Freeport Indonesia | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment owned, percent |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.76% |  |
PT Freeport Indonesia | PT Smelting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment owned, percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |
Subsequent event | Surface Water Taxes, Papua, Indonesia | PT Freeport Indonesia | Tax Authority, In Papau, Indonesia | Penalties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for legal settlements |  |  | $ 50 | Rp 708.5 |  |  |  |  |  |  |  |  |  |  |  |

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