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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Earnings Per Share) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | $ (2,735)us-gaap_ProfitLoss | [1],[2] | $ 704 us-gaap_ProfitLoss | [1],[2] | $ 660 us-gaap_ProfitLoss | [1],[2] | $ 626 us-gaap_ProfitLoss |  | $ 959 us-gaap_ProfitLoss | [3] | $ 1,048 us-gaap_ProfitLoss |  | $ 610 us-gaap_ProfitLoss | [3] | $ 824 us-gaap_ProfitLoss |  | $ (745)us-gaap_ProfitLoss | [1],[2] | $ 3,441 us-gaap_ProfitLoss | [3] | $ 3,980 us-gaap_ProfitLoss |
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 523 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | 761 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  | 939 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |
Preferred dividends attributable to redeemable noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (40)us-gaap_PreferredStockDividendsIncomeStatementImpact |  | (22)us-gaap_PreferredStockDividendsIncomeStatementImpact |  | 0 us-gaap_PreferredStockDividendsIncomeStatementImpact |
Undistributed earnings allocable to participating securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic |  | 0 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic |  | 0 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic |
Net (loss) income allocable to FCX common stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,311)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | $ 2,658 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | $ 3,041 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |
Basic weighted-average shares of common stock outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,039,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 1,002,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 949,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Add shares issuable upon exercise or vesting of dilutive stock options and RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | [4] | 4,000,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | [4] | 5,000,000 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | [4]
Diluted weighted-average shares of common stock outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,039,000,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 1,006,000,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 954,000,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Basic net (loss) income per share attributable to FCX common stockholders | $ (2.75)us-gaap_EarningsPerShareBasic |  | $ 0.53 us-gaap_EarningsPerShareBasic |  | $ 0.46 us-gaap_EarningsPerShareBasic |  | $ 0.49 us-gaap_EarningsPerShareBasic |  | $ 0.68 us-gaap_EarningsPerShareBasic |  | $ 0.79 us-gaap_EarningsPerShareBasic |  | $ 0.49 us-gaap_EarningsPerShareBasic |  | $ 0.68 us-gaap_EarningsPerShareBasic |  | $ (1.26)us-gaap_EarningsPerShareBasic |  | $ 2.65 us-gaap_EarningsPerShareBasic |  | $ 3.20 us-gaap_EarningsPerShareBasic |
Diluted net (loss) income per share attributable to FCX common stockholders | $ (2.75)us-gaap_EarningsPerShareDiluted | [1],[2],[5],[6],[7] | $ 0.53 us-gaap_EarningsPerShareDiluted | [1],[2],[5],[6],[7] | $ 0.46 us-gaap_EarningsPerShareDiluted | [1],[2],[5] | $ 0.49 us-gaap_EarningsPerShareDiluted | [5] | $ 0.68 us-gaap_EarningsPerShareDiluted | [10],[11],[3],[8],[9] | $ 0.79 us-gaap_EarningsPerShareDiluted | [11],[8] | $ 0.49 us-gaap_EarningsPerShareDiluted | [11],[12],[3],[8],[9] | $ 0.68 us-gaap_EarningsPerShareDiluted | [8],[9] | $ (1.26)us-gaap_EarningsPerShareDiluted | [1],[2],[5],[6],[7] | $ 2.64 us-gaap_EarningsPerShareDiluted | [10],[11],[12],[3],[8],[9] | $ 3.19 us-gaap_EarningsPerShareDiluted |
Potential anti-dilutive additional shares of common stock from stock options and restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  | 1,000,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  | 1,000,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |
Outstanding stock options with exercise prices greater than average market price of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,000,000 fcx_OutstandingStockOptionsWithExercisePricesGreaterThanAverageMarketPriceOfCommonStock |  | 30,000,000 fcx_OutstandingStockOptionsWithExercisePricesGreaterThanAverageMarketPriceOfCommonStock |  | 17,000,000 fcx_OutstandingStockOptionsWithExercisePricesGreaterThanAverageMarketPriceOfCommonStock |
Weighted-average exercise price of stock options excluded (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40.52 fcx_WeightedAverageExercisePriceOfOutstandingStockOptions |  | $ 40.23 fcx_WeightedAverageExercisePriceOfOutstandingStockOptions |  | $ 44.73 fcx_WeightedAverageExercisePriceOfOutstandingStockOptions |
[1] | Includes a tax charge of $57 million ($0.06 per share) in the second quarter, $5 million in the third quarter, $22 million ($0.02 per share) in the fourth quarter and $84 million ($0.08 per share) for the year associated with deferred taxes recorded in connection with the allocation of goodwill to the sale of the Eagle Ford properties. Additionally, includes a net tax charge (benefit) of $54 million ($7 million attributable to noncontrolling interests and $47 million to net income attributable to common stockholders or $0.04 per share) in the third quarter, $(17) million ($11 million attributable to noncontrolling interests and $(28) million to net loss attributable to common stockholders or $(0.03) per share) in the fourth quarter and $37 million ($18 million attributable to noncontrolling interests and $19 million to net loss attributable to common stockholders or $0.02 per share) for the year associated with changes in Chilean tax rules, U.S. federal income tax regulations and Peruvian tax rules, partially offset by a tax benefit related to changes in U.S. state income tax filing positions.
[2] | Includes net gains (losses) on early extinguishment of debt totaling $4 million in the second quarter, $17 million ($0.02 per share) in the third quarter, $(18) million ($(0.02) per share) in the fourth quarter and $3 million for the year. Refer to Note 8 for further discussion.
[3] | Includes a net tax benefit of $183 million ($0.19 per share) in the second quarter, $16 million ($0.01 per share) in the fourth quarter and $199 million ($0.20 per share) for the year associated with net reductions in FCX's deferred tax liabilities and deferred tax asset valuation allowances related to the acquisitions of PXP and MMR.
[4] | Excludes shares of common stock associated with outstanding stock options with exercise prices less than the average market price of FCX's common stock and RSUs that were anti-dilutive, with related amounts totaling approximately ten million for the year ended December 31, 2014, and one million for the years ended December 31, 2013 and 2012.
[5] | Includes credits (charges) of $15 million ($9 million to net income attributable to common stockholders or $0.01 per share) in the first quarter, $(7) million ($(4) million to net income attributable to common stockholders) in the second quarter, $122 million ($76 million to net income attributable to common stockholders or $0.07 per share) in the third quarter, $497 million ($309 million to net loss attributable to common stockholders or $0.30 per share) in the fourth quarter and $627 million ($389 million to net loss attributable to common stockholders or $0.37 per share) for the year for net unrealized and noncash realized gains (losses) on crude oil and natural gas derivative contracts.
[6] | Includes net gains of $46 million ($31 million to net income attributable to common stockholders or $0.03 per share) in third quarter, $671 million ($450 million to net loss attributable to common stockholders or $0.43 per share) in the fourth quarter and $717 million ($481 million to net loss attributable to common stockholders or $0.46 per share) for the year primarily from the sale of the Candelaria and Ojos del Salado copper mining operations in the fourth quarter (refer to Note 2 for further discussion) and the sale of a metals injection molding plant in the third quarter.
[7] | Includes a charge of $308 million ($192 million to net income attributable to common stockholders or $0.18 per share) in the third quarter, $3.4 billion ($2.1 billion to net loss attributable to common stockholders or $2.05 per share) in the fourth quarter and $3.7 billion ($2.3 billion to net loss attributable to common stockholders or $2.24 per share) for the year to reduce the carrying value of oil and gas properties pursuant to full cost accounting rules. Additionally, the fourth quarter and the year includes a goodwill impairment charge of $1.7 billion ($1.65 per share) for the full carrying value of goodwill.
[8] | Includes charges of $14 million ($10 million to net income attributable to common stockholders or $0.01 per share) in the first quarter, $61 million ($36 million to net income attributable to common stockholders or $0.04 per share) in the second quarter, $1 million ($1 million to net income attributable to common stockholders) in the third quarter, $4 million ($3 million to net income attributable to common stockholders) in the fourth quarter and $80 million ($50 million to net income attributable to common stockholders or $0.05 per share) for the year for transaction and related costs principally associated with the acquisitions of PXP and MMR.
[9] | Includes net (losses) gains on early extinguishment of debt totaling $(40) million ($(0.04) per share) in the first quarter, $5 million ($0.01 per share) in the second quarter for an adjustment related to taxes on the first quarter losses, $7 million ($0.01 per share) in the fourth quarter and $(28) million ($(0.03) per share) for the year. Refer to Note 8 for further discussion.
[10] | Includes charges in the fourth quarter and for the year of (i) $76 million ($49 million to net income attributable to common stockholders or $0.05 per share) associated with updated mine plans at Morenci that resulted in a loss in recoverable copper in leach stockpiles, (ii) $37 million ($23 million to net income attributable to common stockholders or $0.02 per share) associated with the restructuring of an executive employment arrangement and (iii) $36 million ($13 million to net income attributable to common stockholders or $0.01 per share) associated with a new labor agreement at Cerro Verde.
[11] | Includes charges of $36 million ($23 million to net income attributable to common stockholders or $0.02 per share) in the second quarter, $158 million ($98 million to net income attributable to common stockholders or $0.09 per share) in the third quarter, $118 million ($73 million to net income attributable to common stockholders or $0.07 per share) in the fourth quarter and $312 million ($194 million to net income attributable to common stockholders or $0.19 per share) for the year (reflecting the seven-month period from June 1, 2013, to December 31, 2013) for unrealized and noncash realized losses on crude oil and natural gas derivative contracts.
[12] | Includes a gain of $128 million ($0.13 per share) in the second quarter and for the year related to FCX's preferred stock investment in and the subsequent acquisition of MMR. Refer to Note 2 for further discussion.

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