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Commitments and Contingencies Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Energy Segment
Loss Contingencies [Line Items]
Environmental loss contingency accrual	$ 11	$ 6
Price of RINs	190	43	$ 60
Biofuel blending obligation	214	7
Metals Segment
Loss Contingencies [Line Items]
Environmental loss contingency accrual	$ 25	27
Starfire Holding Corporation
Loss Contingencies [Line Items]
Ownership percentage by principal owner	99.60%
Pension funding indemnity agreement with subsidiary	$ 250
ACF
Loss Contingencies [Line Items]
Funded status of related party pension plan	122
Accrued expenses and other liabilities
Loss Contingencies [Line Items]
Environmental loss contingency accrual	$ 37	$ 34
Icahn Enterprises Holdings
Loss Contingencies [Line Items]
Affiliate ownership interest	99.00%
Mr. Icahn and affiliates
Loss Contingencies [Line Items]
Affiliate ownership interest	92.00%
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	92.00%

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-Name Accounting Standards Codification
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-SubTopic 20
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