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Commitments and Contingencies - Narrative (Details) item in Millions, $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 22, 2025 USD ($) item	Aug. 31, 2025 USD ($) plaintiff	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Jan. 31, 2023 USD ($)
Commitments and Contingencies
Environmental loss contingency accrual			$ 3		$ 3		$ 3
Value of reduction in renewable fuel credits	$ 488
Minimum Carbon Dioxide Supply								$ 15
Maximum fee payable								$ 45
Number of Plaintiffs | plaintiff		3
Amount of quantifying alleged damages		$ 60
Minimum
Commitments and Contingencies
Reduction in renewable fuel credits | item	424
Energy
Commitments and Contingencies
Expense (benefit)			(417)	$ 86	(171)	$ 65
RFS position			93		$ 93		$ 323
Mr. Icahn and affiliates | Minimum
Commitments and Contingencies
Affiliate ownership interest					80.00%
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%
ACF
Commitments and Contingencies
Funded status of related party pension plan			$ 21		$ 21
ACF | Icahn Enterprises Holdings | Minimum
Commitments and Contingencies
Ownership percentage by principal owner			80.00%		80.00%
Starfire Holding Corporation
Commitments and Contingencies
Ownership percentage by principal owner			99.60%		99.60%
Pension funding indemnity agreement with subsidiary			$ 250		$ 250

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