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Commitments and Contingencies - Narrative (Details)		12 Months Ended
	Aug. 19, 2024 USD ($)	Dec. 31, 2024 USD ($) lawsuit	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 31, 2023 USD ($)
Commitments and Contingencies
Environmental loss contingency accrual		$ 3,000,000	$ 19,000,000
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]		Accrued Liabilities	Accrued Liabilities
Minimum Carbon Dioxide Supply					$ 15,000,000
Maximum fee payable					$ 45,000,000
Civil penalty	$ 1,500,000
Energy
Commitments and Contingencies
Expense (benefit)		$ 46,000,000	$ 114,000,000	$ 435,000,000
RFS position		323,000,000	$ 329,000,000
Insurance policies coverage limits		$ 50,000,000
Icahn Enterprises Holdings
Commitments and Contingencies
Affiliate ownership interest		99.00%
Icahn Enterprises G.P. | Mr. Icahn and affiliates
Commitments and Contingencies
Affiliate ownership in parent company general partner		100.00%
Icahn Enterprises Holdings | Mr. Icahn and affiliates
Commitments and Contingencies
Affiliate ownership interest		86.00%
Minimum | Mr. Icahn and affiliates
Commitments and Contingencies
Affiliate ownership interest		80.00%
Starfire Holding Corporation
Commitments and Contingencies
Ownership percentage by principal owner		99.60%
Pension funding indemnity agreement with subsidiary		$ 250,000,000
ACF
Commitments and Contingencies
Funded status of related party pension plan		$ 21,000,000
ACF | Minimum | Icahn Enterprises Holdings
Commitments and Contingencies
Ownership percentage by principal owner		80.00%
General partner | Carl C. Icahn
Commitments and Contingencies
Civil penalty	$ 500,000
Call option lawsuits | Energy
Commitments and Contingencies
Lawsuits relating to settlement | lawsuit		2

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