The amount of redemption amount of principal amount of debt.

No definition available.

Name:	iep_DebtInstrumentRedemptionAmount
Namespace Prefix:	iep_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

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

- Definition

Amount of short-term and long-term debt and lease obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

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

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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.(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

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

Debt (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
Debt (Details) - USD ($) $ in Thousands	Aug. 31, 2021	Jan. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Apr. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt			$ 7,712,000		$ 7,712,000				$ 8,059,000
Amortization included in interest expense			3,000	$ 2,000	4,000	$ 4,000
Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of Lines of Credit	$ 350,000
Holding Company
Debt Instrument [Line Items]
Gain on extinguishment of debt		$ 2,000
Debt			5,810,000		5,810,000				5,811,000
Energy Segment
Debt Instrument [Line Items]
Debt			1,676,000		1,676,000				1,691,000
Automotive Segment
Debt Instrument [Line Items]
Debt			16,000		16,000				368,000
Food Packaging Segment
Debt Instrument [Line Items]
Debt			154,000		154,000				151,000
Metals Segment
Debt Instrument [Line Items]
Debt			18,000		18,000				16,000
Real Estate Segment
Debt Instrument [Line Items]
Debt			2,000		2,000				1,000
Home Fashion Segment
Debt Instrument [Line Items]
Debt			36,000		36,000				21,000
Reporting Segments
Debt Instrument [Line Items]
Debt			1,902,000		1,902,000				$ 2,248,000
6.250% senior unsecured notes due 2022 \| Holding Company
Debt Instrument [Line Items]
Interest rate on debt issued		6.25%							6.25%
Redemption of senior notes		$ 750,000,000						$ 455,000
Debt			$ 0		$ 0				$ 1,209,000
6.750% senior unsecured notes due 2024 \| Holding Company
Debt Instrument [Line Items]
Interest rate on debt issued			6.75%		6.75%				6.75%
Debt			$ 499,000		$ 499,000				$ 499,000
4.750% senior unsecured notes due 2024 \| Holding Company
Debt Instrument [Line Items]
Interest rate on debt issued			4.75%		4.75%				4.75%
Debt			$ 1,105,000		$ 1,105,000				$ 1,106,000
6.375% senior unsecured notes due 2025 \| Holding Company
Debt Instrument [Line Items]
Interest rate on debt issued			6.375%		6.375%				6.375%
Debt			$ 748,000		$ 748,000				$ 748,000
6.250% senior unsecured notes due 2026 \| Holding Company
Debt Instrument [Line Items]
Interest rate on debt issued			6.25%		6.25%				6.25%
Debt			$ 1,250,000		$ 1,250,000				$ 1,250,000
5.250% senior unsecured notes due 2027
Debt Instrument [Line Items]
Interest rate on debt issued								5.25%
Redemption of senior notes								$ 1,000,000
5.250% senior unsecured notes due 2027 \| Holding Company
Debt Instrument [Line Items]
Face value of debit issued								$ 455,000
Interest rate on debt issued			5.25%		5.25%			5.25%	5.25%
Debt			$ 1,461,000		$ 1,461,000				$ 999,000
4.375% senior unsecured notes due 2029 \| Holding Company
Debt Instrument [Line Items]
Face value of debit issued		$ 750,000
Interest rate on debt issued		4.375%	4.375%		4.375%
Debt			$ 747,000		$ 747,000				$ 0
6.125% senior secured notes due 2028 \| Energy Segment
Debt Instrument [Line Items]
Face value of debit issued							$ 550,000
Interest rate on debt issued							6.125%
9.25% senior secured notes due 2023 \| Energy Segment
Debt Instrument [Line Items]
Interest rate on debt issued							9.25%