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Commitments and Contingencies - Narrative (Details) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Jul. 31, 2023 item	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jan. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Environmental loss contingency accrual	$ 20		$ 20		$ 20			$ 22
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities		Accrued Liabilities		Accrued Liabilities			Accrued Liabilities
Minimum Carbon Dioxide Supply							$ 15
Maximum fee payable							$ 45
Number of petitions denied | item		26
Starfire Holding Corporation
Loss Contingencies [Line Items]
Ownership percentage by principal owner	99.60%		99.60%		99.60%
Pension funding indemnity agreement with subsidiary	$ 250		$ 250		$ 250
ACF
Loss Contingencies [Line Items]
Funded status of related party pension plan	$ 35		$ 35		$ 35
Icahn Enterprises Holdings | ACF | Minimum
Loss Contingencies [Line Items]
Ownership percentage by principal owner	80.00%		80.00%		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					85.00%
Energy Segment
Loss Contingencies [Line Items]
Expense (benefit)			$ (135)	$ 86	$ (99)	$ 328
RFS position	$ 413		$ 413		$ 413			$ 692
Insurance policies coverage limits	$ 50

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