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Contingencies and Commitments (Unaudited) (Details) (PT Freeport Indonesia [Member], USD $) In Millions, unless otherwise specified			1 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Aug. 31, 2014 Subsequent Event [Member]
Loss Contingencies [Line Items]
Proceeds from Income Tax Refunds			$ 151
Tax Overpayment		303
Disputed Tax Assessments Receivable	$ 379

X

- Definition

Disputed tax assessments (including interest and penalties) receivable.

+ References

No definition available.

+ Details

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

X

- Definition

Total tax payments made in excess of corresponding tax obligation as of the period end date.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

The amount of cash received during the period as refunds for the overpayment of taxes.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

+ Details

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