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CONTINGENCIES (Asset Retirement Obligations) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Balance at beginning of year | $ 1,146,000,000 | $ 921,000,000 |  | $ 856,000,000 |
Liabilities assumed in the acquisitions of PXP and MMR |  | 0 | [1] | 0 | [1]
Liabilities incurred | 45,000,000 | 6,000,000 |  | 9,000,000 |
Settlements and revisions to cash flow estimates, net | 123,000,000 | 211,000,000 |  | 48,000,000 |
Accretion expense | 95,000,000 | 55,000,000 |  | 58,000,000 |
Spending | (107,000,000) | (47,000,000) |  | (49,000,000) |
Other | (2,000,000) | 0 |  | (1,000,000) |
Balance at end of year | 2,328,000,000 | 1,146,000,000 |  | 921,000,000 |
Less current portion | (115,000,000) | (55,000,000) |  | (31,000,000) |
Long-term portion | 2,213,000,000 | 1,091,000,000 |  | 890,000,000 |
Fair Value Assumptions, Inflation Rate | 2.50% |  |  |  |
Financial Assurance Obligations Associated With Closure And Reclamation Costs | 2,400,000,000 |  |  |  |
Financial Assurance Obligations Associated With Closure And Reclamation Costs In Form Of Parent Company Guarantees And Financial Capability Demonstrations | 1,700,000,000 |  |  |  |
Legally Restricted Funds For Asset Retirement Obligations | 158,000,000 | 161,000,000 |  |  |
Productive Oil Wells, Number of Wells, Gross | 6,600 |  |  |  |
Asset Retirement Obligations, Number of Platforms | 200 |  |  |  |
New Mexico environmental and reclamation programs [Member] |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Accrued reclamation and closure costs | 465,000,000 |  |  |  |
Arizona environmental and reclamation programs [Member] |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Accrued reclamation and closure costs | 237,000,000 |  |  |  |
Colorado Environmental And Reclamation Programs [Member] |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Accrued reclamation and closure costs | 50,000,000 |  |  |  |
Chile environmental and reclamation programs [Member] |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Accrued reclamation and closure costs | 69,000,000 |  |  |  |
Peru Environmental and Reclamation Programs [Member] |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Accrued reclamation and closure costs | 79,000,000 |  |  |  |
PT Freeport Indonesia environmental and reclamation programs [Member] |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Accrued reclamation and closure costs | 249,000,000 |  |  |  |
Estimated years the mining activities are expected to continue (in years) | 30 years |  |  |  |
Current cash balance of reclamation fund | 18,000,000 |  |  |  |
Minimum [Member] |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Fair Value Assumptions, Risk Free Interest Rate | 1.30% |  |  |  |
Maximum [Member] |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Fair Value Assumptions, Risk Free Interest Rate | 6.30% |  |  |  |
Scenario, Forecast [Member] | Minimum [Member] | PT Freeport Indonesia environmental and reclamation programs [Member] |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Current cash balance of reclamation fund | 100,000,000 |  |  |  |
Plains Exploration & Production Company [Member] |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Liabilities assumed in the acquisitions of PXP and MMR | 741,000,000 |  |  |  |
McMoRan Exploration Co [Member] |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Liabilities assumed in the acquisitions of PXP and MMR | 287,000,000 |  |  |  |
Freeport-McMoRan Oil & Gas [Member] |  |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Long-term portion | $ 1,100,000,000 |  |  |  |
[1] | The fair value of AROs assumed in the acquisitions of PXP and MMR ($741 million and $287 million, respectively) were estimated based on projected cash flows, an estimated long-term annual inflation rate of 2.5 percent, and discount rates based on FCX's estimated credit-adjusted, risk-free interest rates ranging from 1.3 percent to 6.3 percent.

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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of a reclamation and mine closing liability that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and revegetation of waste rock piles and other disturbed areas. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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