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Debt and Equity Transactions (Unaudited) (Details) - USD ($) shares in Millions |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 04, 2016 | Jul. 29, 2016 | Jan. 05, 2016 | Aug. 04, 2016 | Jul. 31, 2016 | Feb. 26, 2016 | Jun. 30, 2016 | Dec. 31, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jan. 05, 2016 | Dec. 31, 2015
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | [1] |  |  |  |  |  |  | $ 19,319,000,000 |  | $ 19,319,000,000 |  |  | $ 20,428,000,000
Debt, Current |  |  |  |  |  |  |  | (770,000,000) |  | (770,000,000) |  |  | (649,000,000)
Long-term debt, less current portion |  |  |  |  |  |  |  | 18,549,000,000 |  | 18,549,000,000 |  |  | 19,779,000,000
Liabilities, Fair Value Adjustment |  |  |  |  |  |  |  |  |  | 195,000,000 |  |  | 210,000,000
Unamortized Debt Issuance Expense |  |  |  |  |  |  |  | 120,000,000 |  | 120,000,000 |  |  | $ 129,000,000
Early Repayment of Subordinated Debt |  |  |  |  |  |  |  | $ 568,000,000 |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 4 |  |  |  | 17 |  |  |  | 210 | 206
Extinguishment of Debt, Amount |  |  |  |  |  |  |  | $ 266,000,000 |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  | $ 1,970,000,000 |  |  |  |  |  | 32,000,000 | $ 0 |  |
Fees and Commissions |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |
Bank Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | 2,446,000,000 |  | 2,446,000,000 |  |  | $ 3,032,000,000
Credit Facility [Domain] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | 0 |  | 0 |  |  | 0
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 |  |  |  |  |  |  |  | 40,000,000 |  | 40,000,000 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  | 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 |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | 192,000,000 |  | 192,000,000 |  |  | 442,000,000
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | 11,648,000,000 |  | 11,648,000,000 |  |  | 11,908,000,000
Extinguishment of Debt, Amount |  |  |  |  |  |  |  | 268,000,000 |  |  |  |  |
Extinguishment of Debt, Principal Amount |  |  |  |  |  |  |  | 268,000,000 |  |  |  |  |
Notes Payable, Other Payables [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | 105,000,000 |  | 105,000,000 |  |  | 108,000,000
Cerro Verde [Member] | Credit Facility [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | 1,784,000,000 |  | 1,784,000,000 |  |  | 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 |  |  | 259,000,000
Freeport-McMoRan Oil & Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, less current portion |  |  |  |  |  |  |  | 7,425,000,000 |  | 7,425,000,000 |  |  | 5,883,000,000
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  |  |  | 0 |  |  |
Freeport-McMoRan Oil & Gas [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | 2,524,000,000 |  | 2,524,000,000 |  |  | 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
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Value of Shares Authorized for Issue in Transaction |  |  | $ 12,000,000 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  | 8 | 3 |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  |  |  |  | $ 226,000,000 |  |  |  |  |  |  |
Subsequent Event [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Principal Amount |  |  |  |  | $ 101,000,000 |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  |  | 70 |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  |  | $ 32,000,000 |  |  |  |  |  |  |  |  | $ 2,000,000,000
Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Value of Shares Authorized for Issue in Transaction |  | $ 12.69 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  | 167,000,000 |  |  | $ 85,000,000 |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  | 166,000,000 |  |  |  |  |  |  |  |  |  |  |
Fees and Commissions |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Sales Required |  |  |  |  |  |  |  | $ 3,000,000,000 |  | $ 3,000,000,000 |  |  |
Maximum [Member] | Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 13 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |
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 |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  |  |  |  |  |  | $ 540,000,000 |  |  |  |  |
Fees and Commissions |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |
[1] | a.Includes additions for unamortized fair value adjustments totaling $195 million at June 30, 2016, and $210 million at December 31, 2015, and net reductions for unamortized debt issuance costs and unamortized discounts of $120 million at June 30, 2016, and $129 million at December 31, 2015.

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