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Debt and Equity Transactions (Unaudited) (Details) - USD ($) shares in Millions |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 29, 2016 | Jan. 05, 2016 | Nov. 08, 2016 | Feb. 26, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Jan. 05, 2016 | Dec. 31, 2015
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | [1] |  |  |  |  | $ 18,982,000,000 |  |  | $ 18,982,000,000 |  | $ 18,982,000,000 |  |  | $ 20,428,000,000
Debt, Current |  |  |  |  |  | (802,000,000) |  |  | (802,000,000) |  | (802,000,000) |  |  | (649,000,000)
Long-term debt, less current portion |  |  |  |  |  | 18,180,000,000 |  |  | 18,180,000,000 |  | 18,180,000,000 |  |  | 19,779,000,000
Liabilities, Fair Value Adjustment |  |  |  |  |  |  |  |  |  |  | 187,000,000 |  |  | 210,000,000
Unamortized Debt Issuance Expense |  |  |  |  |  | 111,000,000 |  |  | $ 111,000,000 |  | 111,000,000 |  |  | 129,000,000
Early Repayment of Subordinated Debt |  |  |  |  |  |  | $ 568,000,000 |  |  |  |  |  |  |
Common Stock, Value of Shares Authorized for Issue in Transaction |  | $ 12,000,000 |  |  |  | $ 12.39 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  | 33.5 |  |  | 28.0 |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  |  |  |  | $ 415,000,000 |  |  | $ 311,000,000 |  | 1,500,000,000 |  |  | 2,000,000,000
Extinguishment of Debt, Amount |  |  |  |  |  |  |  |  | 365,000,000 |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  | $ 1,970,000,000 |  |  | 411,000,000 |  |  |  |  | 442,000,000 | $ 999,000,000 |  |
Fees and Commissions |  |  | $ 20,000,000 |  |  | 4,000,000 |  |  |  |  |  |  |  |
Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 2,448,000,000 |  |  | 2,448,000,000 |  | 2,448,000,000 |  |  | 3,032,000,000
Credit Facility [Domain] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 0 |  |  | 0 |  | 0 |  |  | 0
Debt Instrument, Amendment Date |  |  |  |  | Feb. 26, 2016 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 3,500,000,000 |  |  |  |  |  |  |  |  | 4,000,000,000
Letters of Credit Issued, Amount |  |  |  |  |  | 43,000,000 |  |  | 43,000,000 |  | 43,000,000 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  | 3,500,000,000 |  |  | 3,500,000,000 |  | 3,500,000,000 |  |  |
Line Of Credit Facility Remaining Borrowing Capacity Available For Letters Of Credit |  |  |  |  |  | 1,500,000,000 |  |  | 1,500,000,000 |  | 1,500,000,000 |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 129,000,000 |  |  | 129,000,000 |  | 129,000,000 |  |  | 442,000,000
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 11,552,000,000 |  |  | 11,552,000,000 |  | 11,552,000,000 |  |  | 11,908,000,000
Extinguishment of Debt, Amount |  |  |  |  |  |  |  |  | 369,000,000 |  |  |  |  |
Extinguishment of Debt, Principal Amount |  |  |  |  |  |  |  |  | 369,000,000 |  |  |  |  |
Notes Payable, Other Payables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 104,000,000 |  |  | 104,000,000 |  | 104,000,000 |  |  | 108,000,000
Cerro Verde [Member] | Credit Facility [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 1,612,000,000 |  |  | 1,612,000,000 |  | 1,612,000,000 |  |  | 1,781,000,000
Cerro Verde [Member] | Shareholder Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 261,000,000 |  |  | 261,000,000 |  | 261,000,000 |  |  | 259,000,000
Freeport-McMoRan Oil & Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, less current portion |  |  |  |  |  | 7,624,000,000 |  |  | 7,624,000,000 |  | 7,624,000,000 |  |  | 5,883,000,000
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Freeport-McMoRan Oil & Gas [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 2,517,000,000 |  |  | 2,517,000,000 |  | 2,517,000,000 |  |  | 2,539,000,000
Freeport McMoRan Corporation [Member] | Subordinated Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  | 359,000,000 |  |  | 359,000,000 |  | $ 359,000,000 |  |  | $ 359,000,000
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Value of Shares Authorized for Issue in Transaction |  |  |  | $ 11.54 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 26.3 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  |  | $ 304,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  | 301,000,000 |  |  |  |  |  |  |  |  |  |
Fees and Commissions |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 4.0 |  |  |  |  |  |  |  | 114.0 |  | 210.0 | 206.0
Proceeds from Issuance of Common Stock, Gross |  |  | $ 32,000,000 |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Sales Required |  |  |  |  |  | 3,000,000,000 |  |  | $ 3,000,000,000 |  | $ 3,000,000,000 |  |  |
Morenci [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Ownership, Percentage |  |  |  |  |  |  |  |  |  | 13.00% |  |  |  |
Ultra-deepwater Drillship Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  | 48.0 |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  |  |  |  |  | $ 540,000,000 |  |  |  |  |  |  |
Fees and Commissions |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |
Oil and Gas Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Costs Capitalized |  |  |  |  |  | $ 0 | $ 0 | $ 12,000,000 |  |  | $ 7,000,000 | $ 50,000,000 |  |
[1] | a.Includes additions for unamortized fair value adjustments totaling $187 million at September 30, 2016, and $210 million at December 31, 2015, and net reductions for unamortized debt issuance costs and unamortized discounts of $111 million at September 30, 2016, and $129 million at December

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