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Debt and Equity - Components of Debt (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 9,621.0 | $ 9,450.0
Less current portion of debt | (1,365.0) | (372.0)
Long-term debt, less current portion | 8,256.0 | 9,078.0
Senior Notes | FCX |  |
Debt Instrument [Line Items] |  |
Long-term debt | 8,270.0 | 8,268.0
Debentures | Freeport McMoRan Corporation |  |
Debt Instrument [Line Items] |  |
Long-term debt | 355.0 | 355.0
Line of Credit | PT-FI Term Loan |  |
Debt Instrument [Line Items] |  |
Long-term debt | 603.0 | 432.0
Line of Credit | Cerro Verde |  |
Debt Instrument [Line Items] |  |
Long-term debt | 325.0 | 325.0
Line of Credit | Cerro Verde | 3.55% Senior Notes Due June 2022 |  |
Debt Instrument [Line Items] |  |
Less current portion of debt | (325.0) |
Line of Credit | Cerro Verde | 3.875% Senior Notes Due 2023 |  |
Debt Instrument [Line Items] |  |
Less current portion of debt | (995.0) |
Other Debt, Including Capital Leases and Short Term Borrowings [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 68.0 | $ 70.0

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