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Earnings Per Share (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Earnings Per Share [Abstract] |  |  |  |
Net (loss) income | $ (2,406)us-gaap_ProfitLoss |  | $ 626 us-gaap_ProfitLoss |
Net income attributable to noncontrolling interests | (58)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | (106)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |
Preferred dividends on redeemable noncontrolling interest | (10)us-gaap_PreferredStockDividendsIncomeStatementImpact |  | (10)us-gaap_PreferredStockDividendsIncomeStatementImpact |
Undistributed earnings allocable to participating securities | (3)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic |  | (1)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic |
Net (loss) income allocable to common stockholders | $ (2,477)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | $ 509 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |
Basic weighted-average shares of common stock outstanding | 1,040 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 1,038 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Add shares issuable upon exercise or vesting of dilutive stock options and RSUs | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | [1] | 6 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | [1]
Diluted weighted-average shares of common stock outstanding | 1,040 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 1,044 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Basic net (loss) income per share attributable to common stockholders | $ (2.38)us-gaap_EarningsPerShareBasic |  | $ 0.49 us-gaap_EarningsPerShareBasic |
Diluted net (loss) income per share attributable to common stockholders | $ (2.38)us-gaap_EarningsPerShareDiluted |  | $ 0.49 us-gaap_EarningsPerShareDiluted |
Potential anti-dilutive additional shares of common stock (in shares) | 3 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  | 2 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |
Outstanding stock options with exercise prices greater than average market price of common stock (in shares) | 40 fcx_OutstandingStockOptionsWithExercisePricesGreaterThanAverageMarketPriceOfCommonStock |  | 30 fcx_OutstandingStockOptionsWithExercisePricesGreaterThanAverageMarketPriceOfCommonStock |
[1] | Excludes shares of common stock totaling approximately three million for first-quarter 2015 and two million for first-quarter 2014 associated with outstanding stock options with exercise prices less than the average market price of FCX's common stock and RSU's that were anti-dilutive.

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- Definition Outstanding stock options with exercise prices greater than the average market price of FCX's common stock during the period, which are excluded from the computation of diluted net income per share of common stock. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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