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Description of Business (Details) $ in Millions				1 Months Ended	3 Months Ended	12 Months Ended
Description of Business (Details) $ in Millions	Dec. 07, 2021	Jul. 31, 2019	Jan. 29, 2019 USD ($)	Oct. 31, 2020 USD ($) shares	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) item segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Description of Business [Line Items]
Aggregate general partner ownership interest of parent and operating subsidiary						1.99%
Purchase of additional interests in consolidated subsidiaries								$ (241)
Number of Operating Segments \| segment						2
Proceeds from disposition of businesses and assets						$ 414	$ 25	505
Gain (loss) on disposition of assets, net						141	(17)	253
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	323
Energy Segment
Description of Business [Line Items]
Gain (loss) on disposition of assets, net						(3)	(7)	4
Automotive Segment
Description of Business [Line Items]
Gain (loss) on disposition of assets, net						(22)	(6)	(4)
Food Packaging Segment
Description of Business [Line Items]
Gain (loss) on disposition of assets, net						0
Real Estate Segment
Description of Business [Line Items]
Gain (loss) on disposition of assets, net						3	$ (5)
Mining Segment
Description of Business [Line Items]
Gain (loss) on disposition of assets, net						0		$ 252
Pharma Segment
Description of Business [Line Items]
Gain (loss) on disposition of assets, net						$ 0
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						88.00%
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%
Icahn Enterprises G.P. \| Mining Segment
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary		77.00%
CVR Refining
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary						36.00%
CVR Refining \| Energy Segment
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			4.00%
CVR Energy \| Energy Segment
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			81.00%			71.00%
Viskase \| Private Placement
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary						89.00%	79.00%
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	$ 4,300
CVR Refining \| Energy Segment
Description of Business [Line Items]
Purchase of additional interests in consolidated subsidiaries			$ 241
Ferrous Resources \| Mining Segment
Description of Business [Line Items]
Proceeds from disposition of businesses and assets						$ 463
Gain (loss) on disposition of assets, net							$ 252
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