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Debt and Equity Transactions (Unaudited) (Details) - USD ($) $ in Thousands, shares in Millions |  |  | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 29, 2016 | Jan. 05, 2016 | Feb. 26, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Extinguishment of Debt [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | [1] |  |  |  | $ 20,777,000 | $ 20,428,000
Debt, Current |  |  |  |  | (1,139,000) | (649,000)
Long-term debt, less current portion |  |  |  |  | 19,638,000 | 19,779,000
Liabilities, Fair Value Adjustment |  |  |  |  | 203,000 | 210,000
Unamortized Debt Issuance Expense |  |  |  |  | 130,000 | 129,000
Stock Issued During Period, Shares, New Issues |  |  | 210 |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  | $ 1,970,000 |  |  |
Fees and Commissions |  |  | $ 20,000 |  |  |
Bank Term Loan [Member] |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | 3,011,000 | 3,032,000
Credit Facility [Domain] | Revolving Credit Facility [Member] |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | 480,000 | 0
Debt Instrument, Amendment Date |  |  |  | Feb. 26, 2016 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 3,500,000 |  | 4,000,000
Letters of Credit Issued, Amount |  |  |  |  | 38,000 |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | 3,000,000 |
Line Of Credit Facility Remaining Borrowing Capacity Available For Letters Of Credit |  |  |  |  | 1,500,000 |
Line of Credit [Member] |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | 332,000 | 442,000
Senior Notes [Member] |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | 11,911,000 | 11,908,000
Notes Payable, Other Payables [Member] |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | 108,000 | 108,000
Cerro Verde [Member] | Credit Facility [Domain] |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | 1,783,000 | 1,781,000
Cerro Verde [Member] | Shareholder Loan [Member] |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | 261,000 | 259,000
Freeport-McMoRan Oil & Gas [Member] |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |
Long-term debt, less current portion |  |  |  |  | 6,592,000 | 5,883,000
Freeport-McMoRan Oil & Gas [Member] | Senior Notes [Member] |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | 2,532,000 | 2,539,000
Freeport McMoRan Corporation [Member] | Subordinated Debt [Member] |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  | $ 359,000 | 359,000
Subsequent Event [Member] |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |
Common Stock, Value of Shares Authorized for Issue in Transaction |  | $ 12,000 |  |  |  |
Common Stock [Member] |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  | 5 |
Proceeds from Issuance of Common Stock, Gross |  |  |  |  |  | $ 2,000,000
[1] | a.Includes additions for unamortized fair value adjustments totaling $203 million at March 31, 2016, and $210 million at December 31, 2015, and net reductions for unamortized debt issuance costs and unamortized discounts of $130 million at March 31, 2016, and $129 million at December 31, 2015.

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