The dollar value of the pounds of copper purchased from joint venture partner.

No definition available.

Name:	fcx_DollarValueOfPoundsPurchasedFromJointVenturePartner
Namespace Prefix:	fcx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Estimated Recoverable Proven And Probable Reserves

+ References

No definition available.

+ Details

Name:	fcx_EstimatedRecoverableProvenAndProbableReserves
Namespace Prefix:	fcx_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	instant

- Definition

Joint Venture Interest In Assets And Production

+ References

No definition available.

+ Details

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

- Definition

Number of pounds of copper purchased from joint venture partner's share of Morenci's production.

+ References

No definition available.

+ Details

Name:	fcx_NumberOfPoundsOfCopperPurchasedFromJointVenturePartner
Namespace Prefix:	fcx_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of net assets (liabilities).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77885760&loc=SL35686385-199418

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 205
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=99400292&loc=d3e9915-115836

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(7))
-URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874367-224272

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
-Paragraph 2
-Subparagraph (SX 210.6-05(4))
-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604008-122996

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 220
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-09(6))
-URI http://asc.fasb.org/extlink&oid=114873854&loc=SL114874367-224272

+ Details

Name:	us-gaap_AssetsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amounts due from an entity in which the reporting entity shares joint control with another party or group, due within 1 year (or 1 business cycle).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_DueFromJointVenturesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DueToRelatedPartiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12.3)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-12C.Column D.2)
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010

+ Details

Name:	us-gaap_InvestmentOwnedPercentOfNetAssets
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_RelatedPartyTransactionDueFromToRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

+ Details

Name:	us-gaap_RetainedEarningsAccumulatedDeficit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

OWNERSHIP IN SUBSIDIARIES AND JOINT VENTURES (Details) oz in Millions, lb in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2018 USD ($) lb oz	Dec. 21, 2018	Dec. 31, 2017 USD ($)	May 31, 2016
Summary of investment holdings [Line Items]
Retained Earnings (accumulated deficit)		$ (12,041,000,000)		$ (14,722,000,000)
Freeport-McMoRan Corporation [Member]
Summary of investment holdings [Line Items]
Number of pounds of copper purchased from Sumitomo (in pounds) \| lb		178
Sumitomo Metal Mining, Ltd. and SMM Morenci Inc. [Member]
Summary of investment holdings [Line Items]
Dollar value of pounds purchased from Sumitomo		$ 519,000,000
Due from Joint Ventures, Current		13,000,000
PT-FI
Summary of investment holdings [Line Items]
Net assets (liabilities) in subsidiary		(10,500,000,000)
Retained Earnings (accumulated deficit)		$ 6,600,000,000
Rio Tinto Share In Joint Venture
Summary of investment holdings [Line Items]
Percent interest in certain assets and future production per terms of the joint venture agreement		40.00%
Sumitomo Metal Mining Co., Ltd. [Member]
Summary of investment holdings [Line Items]
Due from Joint Ventures, Current				18,000,000
Copper
Summary of investment holdings [Line Items]
Estimated Recoverable Proven And Probable Reserves (in pounds) \| lb		124,000
Gold
Summary of investment holdings [Line Items]
Estimated Recoverable Proven And Probable Reserves (in pounds) \| oz		30.8
Morenci
Summary of investment holdings [Line Items]
Ownership percentage		72.00%
Morenci \| SMM Morenci Inc.
Summary of investment holdings [Line Items]
Ownership percentage					13.00%
Morenci \| Sumitomo Metal Mining Co., Ltd. [Member]
Summary of investment holdings [Line Items]
Ownership percentage		15.00%
Cerro Verde [Member]
Summary of investment holdings [Line Items]
Ownership percentage		53.56%
Other North America Mines [Member]
Summary of investment holdings [Line Items]
Ownership percentage		100.00%
El Abra [Member]
Summary of investment holdings [Line Items]
Ownership percentage		51.00%
PT Indocopper Investama [Member]
Summary of investment holdings [Line Items]
Ownership percentage			100.00%
Freeport Minerals Corporation [Member]
Summary of investment holdings [Line Items]
Loans outstanding		$ 0
Freeport Minerals Corporation [Member] \| Subsidiaries [Member]
Summary of investment holdings [Line Items]
Net assets (liabilities) in subsidiary		(16,000,000,000)
Retained Earnings (accumulated deficit)		$ (14,000,000,000)
PT-FI
Summary of investment holdings [Line Items]
Ownership percentage		48.76%	81.28%
Loans outstanding		$ 76,000,000
PT-FI \| PT Indocopper Investama [Member]
Summary of investment holdings [Line Items]
Ownership percentage			9.36%
Atlantic Copper [Member]
Summary of investment holdings [Line Items]
Ownership percentage		100.00%
Net assets (liabilities) in subsidiary		$ 23,000,000
Retained Earnings (accumulated deficit)		(436,000,000)
Loans outstanding		$ 434,000,000
Freeport-McMoRan Oil & Gas
Summary of investment holdings [Line Items]
Ownership percentage		100.00%
Net assets (liabilities) in subsidiary		$ 14,200,000,000
Retained Earnings (accumulated deficit)		(25,800,000,000)
Loans outstanding		$ 10,600,000,000
Rio Tinto \| Co-venturer [Member]
Summary of investment holdings [Line Items]
Due to Related Parties, Current				$ 30,000,000
Scenario, Forecast [Member] \| Rio Tinto Share In Joint Venture
Summary of investment holdings [Line Items]
Percent interest in certain assets and future production per terms of the joint venture agreement	40.00%
Morenci
Summary of investment holdings [Line Items]
Ownership percentage					85.00%
Morenci \| SMM Morenci Inc.
Summary of investment holdings [Line Items]
Ownership percentage		13.00%
Morenci \| Sumitomo Metal Mining Co., Ltd. [Member]
Summary of investment holdings [Line Items]
Ownership percentage					15.00%