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Financial Instruments (Unaudited) Oil and Gas (Details) (USD $) In Millions, unless otherwise specified |  |  |  | 6 Months Ended |  | 6 Months Ended |  |  |
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Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Derivatives not designated as hedging instruments [Member] Natural gas swaps [Member] MMBTU | Jun. 30, 2014 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] MMBTU | Jun. 30, 2014 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 5 MBbls [Member] Put Option [Member] MBbls | Jun. 30, 2014 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 30 MBbls [Member] Put Option [Member] MBbls | Jun. 30, 2014 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 75 MBbls [Member] Put Option [Member] MBbls | Jun. 30, 2014 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Natural gas swaps [Member] MMBTU | Jun. 30, 2014 2015 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] MMBTU | Jun. 30, 2014 2015 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 84 MBbls [Member] Put Option [Member] MBbls | Jun. 30, 2014 Deferred Option Premiums and Accrued Interest [Member] | Dec. 31, 2013 Deferred Option Premiums and Accrued Interest [Member] | Jun. 30, 2014 Weighted Average [Member] Crude Oil Options [Member] | Jun. 30, 2014 Weighted Average [Member] 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 5 MBbls [Member] Put Option [Member] | Jun. 30, 2014 Weighted Average [Member] 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 30 MBbls [Member] Put Option [Member] | Jun. 30, 2014 Weighted Average [Member] 2014 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 75 MBbls [Member] Put Option [Member] | Jun. 30, 2014 Weighted Average [Member] 2015 Positions [Member] Derivatives not designated as hedging instruments [Member] Crude Oil Options [Member] 84 MBbls [Member] Put Option [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability | $ 317 | $ 320 |  |  |  |  |  |  |  |  |  |  |  |  | $ 329 | $ 444 |  |  |  |  |  |  |  |  |
Daily Volumes (Bbls) |  |  | 18,000,000 | 20,000,000 | 75 | [1] | 30 | [1] | 5 | [1] | 100,000 | 31,000,000 | 84 | [1] |  |  |  |  |  |  |  |  |  |  |
Derivative, Average Floor Price |  |  |  |  | 90 | [1],[2] | 95 | [1],[2] | 100 | [1],[2] |  |  | 90 | [1],[2] |  |  |  |  |  |  |  |  |  |  |
Derivative, Average Floor Price Limit |  |  |  |  | 70 | [1],[2] | 75 | [1],[2] | 80 | [1],[2] |  |  | 70 | [1],[2] |  |  |  |  |  |  |  |  |  |  |
Deferred Premium Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.49 | 5.74 | [1] | 6.09 | [1] | 7.11 | [1] | 6.89 | [1]
Derivative, Underlying Basis |  |  |  |  | Brent | [1] | Brent | [1] | Brent | [1] |  |  | Brent | [1] |  |  |  |  |  |  |  |  |  |  |
Derivative Latest Maturity Period |  |  |  |  |  |  |  |  |  |  | December 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum Price Limit per Barrel | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Swap Type, Fixed Price |  |  |  |  |  |  |  |  |  |  | 4.09 |  |  |  |  |  |  |  |  |  |  |  |  |  |
[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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- Definition The deferred premium price per unit related to commodity derivative contracts. + References No definition available. + Details
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- Definition The derivative average floor price limit. + References No definition available. + Details
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- Definition The month of the latest date the derivative matures. + References No definition available. + Details
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- Definition The maximum price limit per barrel. + References No definition available. + Details
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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Details
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- Definition Fixed price related to the price risk swap derivative. + References No definition available. + Details
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- Definition Reference to the index or unit of measurement for the underlying which establishes the pricing terms of the derivative instrument. For example, the basis on the underlying for a natural gas futures contract might be the NYMEX price per million British thermal units (MMBtu). + References No definition available. + Details
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