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Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
ACF
Loss Contingencies [Line Items]
Defined benefit plan underfunded amount	$ 114		$ 114
Starfire Holding Corporation
Loss Contingencies [Line Items]
Ownership percentage by Mr. Icahn	99.60%		99.60%
Pension funding indemnity agreement with subsidiary	$ 250		$ 250
Energy Segment
Loss Contingencies [Line Items]
RINs costs	173	$ 16	351	$ 35
RFS position	485		$ 485		$ 214
Icahn Enterprises G.P. | Mr. Icahn and affiliates
Loss Contingencies [Line Items]
Affiliate ownership in parent company general partner			100.00%
Accrued expenses and other liabilities
Loss Contingencies [Line Items]
Accrued environmental liabilities	$ 38		$ 38		$ 37
Icahn Enterprises Holdings | Mr. Icahn and affiliates
Loss Contingencies [Line Items]
Affiliate ownership interest			90.00%

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