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Financial Instruments (Unaudited) Oil and Gas (Details) MMBTU in Millions, $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 USD ($) MBbls MMBTU $ / bbl | Dec. 31, 2014 USD ($)
Derivative [Line Items] |  |  |
Derivative Liability | $ |  | $ 74 | $ 99
Maximum Price Limit per Barrel |  | 20 |
2015 Positions [Member] | Derivatives not designated as hedging instruments [Member] | Crude Oil Options [Member] |  |  |
Derivative [Line Items] |  |  |
Daily Volumes (Bbls) | MMBTU |  | 7.7 |
2015 Positions [Member] | Derivatives not designated as hedging instruments [Member] | Crude Oil Options [Member] | 84 MBbls [Member] |  |  |
Derivative [Line Items] |  |  |
Daily Volumes (Bbls) | MBbls | [1] | 84 |
Derivative, Average Floor Price | [1],[2] | 90 |
Derivative, Average Floor Price Limit | [1],[2] | 70 |
Derivative, Underlying Basis | [1] | Brent |
Deferred Option Premiums and Accrued Interest [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Liability | $ |  | $ 53 | $ 210
Weighted Average [Member] | Crude Oil Options [Member] |  |  |
Derivative [Line Items] |  |  |
Deferred Premium Price |  | 6.89 |
Weighted Average [Member] | 2015 Positions [Member] | Derivatives not designated as hedging instruments [Member] | Crude Oil Options [Member] | 84 MBbls [Member] |  |  |
Derivative [Line Items] |  |  |
Deferred Premium Price | [1] | 6.89 |
[1] | If the index price is less than the per barrel floor, FCX receives the difference between the per barrel floor and the index price up to a maximum of $20 per barrel less the option premium. If the index price is at or above the per barrel floor, FCX pays the option premium and no cash settlement is received.
[2] | The average strike prices do not reflect any premiums to purchase the put options.

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