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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions			3 Months Ended
	Mar. 30, 2022	Dec. 22, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Energy Segment
Loss Contingencies [Line Items]
Environmental loss contingency accrual			$ 24.0		$ 12.0
Price of RINs			107.0	$ 178.0
Amount of quantifying alleged damages in excess	$ 6.8	$ 300.0
RFS position			$ 585.0		494.0
Starfire Holding Corporation
Loss Contingencies [Line Items]
Ownership percentage by principal owner			99.60%
Pension funding indemnity agreement with subsidiary			$ 250.0
ACF
Loss Contingencies [Line Items]
Funded status of related party pension plan			90.0
Accrued expenses and other liabilities
Loss Contingencies [Line Items]
Environmental loss contingency accrual			$ 25.0		$ 13.0
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			87.00%

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