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Debt and Equity Transactions (Unaudited) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Jul. 23, 2014 | Apr. 30, 2014
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Long-term Debt, Gross | $ 20,700,000,000 |  |  | $ 20,700,000,000 |  |  |  |
Liabilities, Fair Value Adjustment |  |  |  | 218,000,000 |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net | 20,000,000 |  |  | 20,000,000 |  |  |  |
Unamortized Debt Issuance Expense | 111,000,000 |  |  | 111,000,000 |  | $ 121,000,000 |  |
Net gain on early extinguishment of debt | 0 | $ 58,000,000 |  | 0 | $ 63,000,000 |  |  |
Bank Term Loan [Member] |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | 4,000,000,000 |  |  | 4,000,000,000 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 205,000,000 |  |  | 205,000,000 |  | 650,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 272,000,000 |  |  | 272,000,000 |  | 200,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 1,000,000,000 |  |  | 1,000,000,000 |  | $ 2,200,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 313,000,000 |  |  | 313,000,000 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 1,300,000,000 |  |  | 1,300,000,000 |  |  |  |
Credit Facility [Domain] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Long-term Debt, Gross | 458,000,000 |  |  | 458,000,000 |  |  |  |
Letters of Credit Issued, Amount | 42,000,000 |  |  | 42,000,000 |  |  |  |
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 |  |  |  |
Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 210,000,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 6.625%
Net gain on early extinguishment of debt |  |  | $ 6,000,000 |  |  |  |  |
Cerro Verde [Member] | Credit Facility [Domain] |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Long-term Debt, Gross | 1,500,000,000 |  |  | 1,500,000,000 |  |  |  |
Letters of Credit Issued, Amount | 0 |  |  | 0 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 301,000,000 |  |  | 301,000,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 1,800,000,000 |  |  | $ 1,800,000,000 |  |  |  |
Term of Debt Agreement |  |  |  | 5 years |  |  |  |
Cerro Verde [Member] | Shareholder Loan [Member] |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Long-term Debt, Gross | 100,000,000 |  |  | $ 100,000,000 |  |  |  |
Debt Instrument, Face Amount | 800,000,000 |  |  | $ 800,000,000 |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  | London Interbank Offered Rate plus the current spread on Cerro Verde’s senior unsecured committed credit facility |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.50% |  |  |  |
Debt Instrument, Maturity Date |  |  |  | Dec. 22, 2019 |  |  |  |
Related Party Transaction, Due from (to) Related Party | $ 57,000,000 |  |  | $ 57,000,000 |  |  |  |
Freeport-McMoRan Oil & Gas [Member] |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Net gain on early extinguishment of debt |  | 58,000,000 |  |  | $ 64,000,000 |  |  |
Freeport-McMoRan Oil & Gas [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  | $ 1,800,000,000 |
Liabilities, Fair Value Adjustment |  | 167,000,000 |  |  |  |  |  |
Extinguishment of Debt, Amount |  | 1,700,000,000 |  |  |  |  |  |
Net gain on early extinguishment of debt |  | 58,000,000 |  |  |  |  |  |
Freeport-McMoRan Oil & Gas [Member] | Senior Notes [Member] | 6.125% Senior Notes due 2019 [Member] |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  | 263,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 6.125% |
Freeport-McMoRan Oil & Gas [Member] | Senior Notes [Member] | 6.5% Senior Notes due 2020 [Member] |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  | 525,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 6.50% |
Freeport-McMoRan Oil & Gas [Member] | Senior Notes [Member] | 6.75% Senior Notes due 2022 [Member] |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  | 350,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 6.75% |
Freeport-McMoRan Oil & Gas [Member] | Senior Notes [Member] | 6.875% Senior Notes due 2023 [Member] |  |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  | $ 525,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 6.875% |

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