Name:	fcx_BusinessAcquisitionDateResultsIncludedinCombinedEntity
Namespace Prefix:	fcx_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

The amount of oil and gas properties not subject to depletion recognized as of the acquisition date.

No definition available.

Name:	fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesNotSubjecttoDepletion
Namespace Prefix:	fcx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of oil and gas properties subject to depletion recognized as of the acquisition date.

No definition available.

Name:	fcx_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOilandGasPropertiesSubjecttoDepletion
Namespace Prefix:	fcx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Threshhold for determining if an oil and gas disposition is accounted for as a reduction to capitalized costs or as a sale, with corresponding gain loss recognized.

No definition available.

Name:	fcx_ThreshholdforDeterminingAccountingTreatmentforOilandGasDispositions
Namespace Prefix:	fcx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258