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Annual coverage limit provided by the insurance arrangement for malpractice claims.

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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
	Nov. 28, 2022	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Jan. 31, 2023
Loss Contingencies [Line Items]
Minimum Carbon Dioxide Supply					$ 15.0
Maximum fee payable					$ 45.0
Expense (benefit)		$ (11.0)
Starfire Holding Corporation
Loss Contingencies [Line Items]
Ownership percentage by principal owner		99.60%
Pension funding indemnity agreement with subsidiary		$ 250.0
ACF
Loss Contingencies [Line Items]
Funded status of related party pension plan		$ 48.0
Icahn Enterprises Holdings \| Viskase And ACF Industries LLC [Member] \| Minimum
Loss Contingencies [Line Items]
Ownership percentage by principal owner		80.00%
Mr. Icahn and affiliates \| Minimum
Loss Contingencies [Line Items]
Affiliate ownership interest		80.00%
Mr. Icahn and affiliates \| Icahn Enterprises G.P.
Loss Contingencies [Line Items]
Affiliate ownership in parent company general partner		100.00%
Mr. Icahn and affiliates \| Icahn Enterprises Holdings
Loss Contingencies [Line Items]
Affiliate ownership interest		84.00%
Energy Segment
Loss Contingencies [Line Items]
Amount of quantifying alleged damages		$ 6.8
Expense (benefit)			$ 107.0
RFS position		582.0		$ 692.0
Insurance policies coverage limits	$ 50.0
Energy Segment \| Call option lawsuits
Loss Contingencies [Line Items]
Litigation settlement paid				79.0
Accrued expenses and other liabilities
Loss Contingencies [Line Items]
Environmental loss contingency accrual		$ 21.0		$ 22.0