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PROPERTY, PLANT, EQUIPMENT AND MINING DEVELOPMENT COSTS, NET (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2007 | Dec. 31, 2008
Property, Plant and Equipment [Line Items] |  |  |  |  |
VBPP recorded in connection with the Phelps Dodge acquisition |  |  |  | $ 2,200,000,000 us-gaap_PaymentsToAcquireMineralRights |
VBPP transferred to proven and probable reserves | 2,000,000 fcx_TransferFromValueBeyondProvenAndProbableReservesToProvenAndProbableReserves | 22,000,000 fcx_TransferFromValueBeyondProvenAndProbableReservesToProvenAndProbableReserves | 762,000,000 fcx_TransferFromValueBeyondProvenAndProbableReservesToProvenAndProbableReserves |  |
Cumulative impairments of VBPP |  |  |  |  | 482,000,000 fcx_CumulativeAssetImpairmentCharges
Mining Operations [Member] |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Capitalized interest total | $ 148,000,000 us-gaap_InterestCostsCapitalized / us-gaap_StatementBusinessSegmentsAxis = fcx_MiningOperationsMember | $ 105,000,000 us-gaap_InterestCostsCapitalized / us-gaap_StatementBusinessSegmentsAxis = fcx_MiningOperationsMember | $ 81,000,000 us-gaap_InterestCostsCapitalized / us-gaap_StatementBusinessSegmentsAxis = fcx_MiningOperationsMember |  |

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition The cash outflow from the acquisition of a mineral right which is the right to extract a mineral from the earth or to receive payment, in the form of royalty, for the extraction of minerals. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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