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INCOME TAXES (Tax Credit Carryforward) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Tax credit carryforward [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 2,306 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | $ 2,144 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 737 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 603 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
U.S. state net operating loss carryforwards [Member] |  |
Tax credit carryforward [Line Items] |  |
Tax credit carryforward, amount | 2,400 us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = fcx_UsStateNetOperatingLossCarryforwardsMember |
Spanish net operating loss carryforwards [Member] |  |
Tax credit carryforward [Line Items] |  |
Tax credit carryforward, amount | 623 us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = fcx_SpanishNetOperatingLossCarryforwardMember |
U.S. Federal Net Operating Loss Carryforwards [Member] |  |
Tax credit carryforward [Line Items] |  |
Tax credit carryforward, amount | 800 us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = fcx_U.S.FederalNetOperatingLossCarryforwardsMember |
Minimum [Member] | U.S. foreign tax credit carryforwards [Member] |  |
Tax credit carryforward [Line Items] |  |
Tax credit carryforward, expiration dates | Jan. 01, 2015 |
Minimum [Member] | U.S. state net operating loss carryforwards [Member] |  |
Tax credit carryforward [Line Items] |  |
Tax credit carryforward, expiration dates | Jan. 01, 2015 |
Minimum [Member] | Spanish net operating loss carryforwards [Member] |  |
Tax credit carryforward [Line Items] |  |
Tax credit carryforward, expiration dates | Jan. 01, 2015 |
Minimum [Member] | U.S. Federal Net Operating Loss Carryforwards [Member] |  |
Tax credit carryforward [Line Items] |  |
Tax credit carryforward, expiration dates | Jan. 01, 2030 |
Maximum [Member] | U.S. foreign tax credit carryforwards [Member] |  |
Tax credit carryforward [Line Items] |  |
Tax credit carryforward, expiration dates | Dec. 31, 2024 |
Maximum [Member] | U.S. state net operating loss carryforwards [Member] |  |
Tax credit carryforward [Line Items] |  |
Tax credit carryforward, expiration dates | Dec. 31, 2034 |
Maximum [Member] | Spanish net operating loss carryforwards [Member] |  |
Tax credit carryforward [Line Items] |  |
Tax credit carryforward, expiration dates | Dec. 31, 2032 |
Maximum [Member] | U.S. Federal Net Operating Loss Carryforwards [Member] |  |
Tax credit carryforward [Line Items] |  |
Tax credit carryforward, expiration dates | Dec. 31, 2034 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Alternative Minimum Tax -URI http://asc.fasb.org/extlink&oid=6504908 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition Expiration date of the tax credit carryforward, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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