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Commitments and Contingencies - Narrative (Details)		3 Months Ended		9 Months Ended
	Aug. 19, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) lawsuit	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Jan. 31, 2023 USD ($)
Commitments and Contingencies
Environmental loss contingency accrual		$ 4,000,000		$ 4,000,000		$ 19,000,000
Minimum Carbon Dioxide Supply							$ 15,000,000
Maximum fee payable							$ 45,000,000
Civil penalty	$ 1,500,000
Number of putative securities | lawsuit				2
Energy
Commitments and Contingencies
Expense (benefit)		86,000,000	$ (135,000,000)	$ 65,000,000	$ (99,000,000)
RFS position		$ 374,000,000		$ 374,000,000		$ 329,000,000
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%		99.60%
Pension funding indemnity agreement with subsidiary		$ 250,000,000		$ 250,000,000
ACF
Commitments and Contingencies
Funded status of related party pension plan		$ 28,000,000		$ 28,000,000
ACF | Minimum | Icahn Enterprises Holdings
Commitments and Contingencies
Ownership percentage by principal owner		80.00%		80.00%
General partner | Carl C. Icahn
Commitments and Contingencies
Civil penalty	$ 500,000

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