Aggregate consideration for business to be disposed of

No definition available.

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Period Type:	instant

- Definition

Contribution to subsidiary

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

[Line Items] for Description of Business

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Aggregate Ownership interest of Parent and Holding Company Subsidiaries

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Proceeds From Rights Offering

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The fair value of investment held in the subsidiary investment funds by the limited liability company or limited partnership.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

+ 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=109223946&loc=d3e3602-108585

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow associated with the purchase of noncontrolling interest during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611443-123010

+ Details

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Data Type:	num:percentItemType
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Period Type:	duration

- Details

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- Details

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- Details

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- Details

Name:	dei_LegalEntityAxis=iep_CvrEnergyIncMember
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- Details

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- Details

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(Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended	6 Months Ended
(Details) - USD ($) $ in Millions	Jan. 29, 2019	Jan. 31, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 05, 2018
Description of Business [Line Items]
Payments to acquire additional interest in subsidiaries				$ 241	$ 0
Icahn Enterprises Holdings
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary				99.00%
Payments to acquire additional interest in subsidiaries				$ 241	0
Investment Funds
Description of Business [Line Items]
Fair value of interest in subsidiary				$ 4,600		$ 5,100
CVR Refining
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary	3.90%
CVR Energy
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary				70.80%
Ferrous Resources
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary				77.20%
Aggregate consideration for business to be disposed of							$ 550
Icahn Enterprises G.P.
Description of Business [Line Items]
General partner ownership percentage in Icahn Enterprises				1.00%
Aggregate general partner ownership interest of parent and operating subsidiary				1.99%
Icahn Enterprises G.P. \| Icahn Enterprises Holdings
Description of Business [Line Items]
General partner ownership percentage in Icahn Enterprises				1.00%
Mr. Icahn and affiliates
Description of Business [Line Items]
Affiliate ownership interest in Icahn Enterprises				92.00%
Energy Segment \| CVR Refining
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary	80.60%
Payments to acquire additional interest in subsidiaries	$ 241
Railcar Segment \| ARL [Member]
Description of Business [Line Items]
Proceeds from sale of assets			$ 2		17
Gain on disposition of assets			$ 1		$ 5
Food Packaging Segment \| Viskase
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary				78.60%	74.60%
Proceeds from subsidiary rights offering		$ 50
Contribution to subsidiary		$ 44