Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023	Jan. 31, 2023
Loss Contingencies [Line Items]
Environmental loss contingency accrual	$ 5		$ 5		$ 19
Minimum Carbon Dioxide Supply						$ 15
Maximum fee payable						$ 45
Starfire Holding Corporation
Loss Contingencies [Line Items]
Ownership percentage by principal owner	99.60%		99.60%
Pension funding indemnity agreement with subsidiary	$ 250		$ 250
ACF
Loss Contingencies [Line Items]
Funded status of related party pension plan	$ 26		$ 26
Icahn Enterprises Holdings | ACF | Minimum
Loss Contingencies [Line Items]
Ownership percentage by principal owner	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
Loss Contingencies [Line Items]
Expense (benefit)	$ 30	$ 48	$ 21	$ 37
RFS position	$ 312		312		$ 329
Insurance policies coverage limits			$ 50