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Description of Business (Details) $ in Millions		1 Months Ended		3 Months Ended	12 Months Ended
	Dec. 07, 2021	Dec. 31, 2022 USD ($) shares	Oct. 31, 2020 USD ($) shares	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) segment item
Description of Business [Line Items]
Aggregate general partner ownership interest of parent and operating subsidiary					1.99%
Purchase of additional interests in consolidated subsidiaries					$ (1)
Number of Operating Segments | segment					2
Disposal Group Not Discontinued Operation Gain Loss On Disposal Statement Of Income Extensible List Not Disclosed Flag				true
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | PSC Metals
Description of Business [Line Items]
Percentage of interest sold	100.00%
Proceeds from sale of equity interests				$ 163
Pretax gain on disposition of assets				$ 323
Icahn Enterprises Holdings
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary					99.00%
Affiliate ownership interest					99.00%
Icahn Enterprises Holdings | Icahn Enterprises G.P.
Description of Business [Line Items]
General partner ownership percentage in Icahn Enterprises					1.00%
Icahn Enterprises Holdings | Mr. Icahn and affiliates
Description of Business [Line Items]
Affiliate ownership interest					85.00%
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%
Affiliate ownership interest					98.01%
CVR Refining
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary					37.00%
CVR Energy | Energy Segment
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary					71.00%
Viskase
Description of Business [Line Items]
Common stock shares acquired | shares		1,123,363
Amount of common stock shares acquired		$ 1
Viskase | Private Placement
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary					90.00%
Common stock shares acquired | shares			50,000,000
Amount of common stock shares acquired			$ 100
Investment Funds
Description of Business [Line Items]
Fair value of investment in subsidiary		4,200			$ 4,200
Vivus | Pharma Segment
Description of Business [Line Items]
Number Of Approved Therapies | item					2
Number Of Product Candidate In Active Clinical Development | item					1
Fair value of debt securities		183			$ 183
Consideration Including Exit policy		81			81
Contingent Liability		$ 3			3
Repayments of Debt					$ 63

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