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Period Type:	duration

Name:	fcx_CapitalExpendituresAbstract
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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets and capitalized interest at the Molybdenum operations.

No definition available.

Name:	fcx_CapitalExpendituresMolybdenum
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Charges for asset retirement obligations and environmental liabilities during the reporting period.

No definition available.

Name:	fcx_ChargesForReclamationAndEnvironmentalObligationsIncludingAccretion
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The net change during the reporting period in the aggregate value of long-term mill and leach stockpile inventories held by the reporting entity, associated with underlying transactions that are classified as operating activities.

No definition available.

Name:	fcx_IncreaseDecreaseInLongTermMillAndLeachStockpiles
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The cash outflow for Indonesian purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets and capitalized interest.

No definition available.

Name:	fcx_IndonesiaCapitalExpenditures
Namespace Prefix:	fcx_
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Balance Type:	credit
Period Type:	duration

The net cash inflow or outflow associated with the exercise of stock options and other share-based awards.

No definition available.

Name:	fcx_NetProceedsPaymentsFromShareBasedAwards
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The cash outflow for North America copper mines' purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets and capitalized interest.

No definition available.

Name:	fcx_NorthAmericaCapitalExpenditures
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Period Type:	duration

The cash outflow for North America oil and gas purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets and capitalized interest.

No definition available.

Name:	fcx_NorthAmericaOilandGasCapitalExpenditures
Namespace Prefix:	fcx_
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Payments for asset retirement obligations and environmental liabilities during the reporting period.

No definition available.

Name:	fcx_PaymentsOfReclamationAndEnvironmentalObligations
Namespace Prefix:	fcx_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

No definition available.

Name:	fcx_PaymentstoAcquireBusinessesNetofCashAcquired1
Namespace Prefix:	fcx_
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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

No definition available.

Name:	fcx_PaymentstoAcquireBusinessesNetofCashAcquired2
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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

No definition available.

Name:	fcx_PaymentstoAcquireBusinessesNetofCashAcquired3
Namespace Prefix:	fcx_
Data Type:	xbrli:monetaryItemType
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The cash outflow for South America copper mines' purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets and capitalized interest.

No definition available.

Name:	fcx_SouthAmericanCapitalExpenditures
Namespace Prefix:	fcx_
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Balance Type:	credit
Period Type:	duration

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In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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-Name Accounting Standards Codification

-Topic 805

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-Section 50

-Paragraph 2

-Subparagraph (g)(2)

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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-Glossary Cash

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-Glossary Cash Equivalents

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

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-Name Accounting Standards Codification

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-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.1)

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-Name Accounting Standards Codification

-Topic 230

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-Section 45

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Name:	us-gaap_CashAndCashEquivalentsAtCarryingValue
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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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-Topic 230

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-Paragraph 24

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-Name Accounting Standards Codification

-Topic 830

-SubTopic 230

-Section 45

-Paragraph 1

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Aggregate depreciation, depletion and amortization expense in the current period for the cost of tangible assets, intangible assets, or depleting assets directly related to goods produced and sold during the reporting period.

No definition available.

Name:	us-gaap_CostOfGoodsSoldDepreciationDepletionAndAmortization
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I.7)

-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section I

-Subsection 7

Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Glossary Deferred Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6510177

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (b)

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Name:	us-gaap_DeferredIncomeTaxExpenseBenefit
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 24

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Name:	us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
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Data Type:	xbrli:monetaryItemType
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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

Name:	us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes.

No definition available.

Name:	us-gaap_IncreaseDecreaseInAccruedTaxesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

Name:	us-gaap_IncreaseDecreaseInInventories
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	us-gaap_IncreaseDecreaseInOperatingCapitalAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The increase (decrease) during the reporting period in other current operating assets not separately disclosed in the statement of cash flows.

No definition available.

Name:	us-gaap_IncreaseDecreaseInOtherCurrentAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The increase (decrease) during the reporting period in other noncurrent operating assets less other noncurrent operating liabilities not separately disclosed in the statement of cash flows.

No definition available.

Name:	us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.

Name:	us-gaap_IncreaseDecreaseInReceivables
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Paragraph 24

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 26

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3574-108585

Name:	us-gaap_NetCashProvidedByUsedInFinancingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Name:	us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 26

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Name:	us-gaap_NetCashProvidedByUsedInInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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-Topic 230

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-Paragraph 28

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-SubTopic 10

-Section 45

-Paragraph 24

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-Topic 230

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Name:	us-gaap_NetCashProvidedByUsedInOperatingActivities
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Name:	us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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

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-Name Accounting Standards Codification

-Topic 230

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-Paragraph 8

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-Name Accounting Standards Codification

-Topic 230

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-Paragraph 9

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Name:	us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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The cash outflow to reacquire preferred stock during the period.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Paragraph 15

-Subparagraph (a)

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Name:	us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
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Name:	us-gaap_PaymentsOfDividendsAbstract
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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

Name:	us-gaap_PaymentsOfDividendsCommonStock
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Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests.

Name:	us-gaap_PaymentsOfDividendsMinorityInterest
Namespace Prefix:	us-gaap_
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The cash outflow for loan and debt issuance costs.

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-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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Name:	us-gaap_PaymentsOfFinancingCosts
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The cash outflow for acquisition of or capital improvements on other tangible or intangible assets not otherwise defined in the taxonomy.

Name:	us-gaap_PaymentsToAcquireOtherProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

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-Name Accounting Standards Codification

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-Subparagraph (g)

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Name:	us-gaap_PensionContributions
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Data Type:	xbrli:monetaryItemType
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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

No definition available.

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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-Name Accounting Standards Codification

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-Topic 810

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-Paragraph 19

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-Topic 810

-SubTopic 10

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-Paragraph 1A

-Subparagraph (a),(c)

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Name:	us-gaap_ProfitLoss
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The cash outflow during the period from the repayment of aggregate short-term and long-term debt and payment of capital lease obligations.

No definition available.

Name:	us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.