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Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Loss Contingencies [Line Items]
Accrued environmental liabilities	$ 49		$ 50
Defined benefit plan underfunded amount	$ 417		424
Mr. Icahn and affiliates
Loss Contingencies [Line Items]
Affiliate ownership interest	91.00%
Starfire Holding Corporation
Loss Contingencies [Line Items]
Ownership percentage by Mr. Icahn	99.40%
Pension funding indemnity agreement with subsidiary	$ 250
Automotive Segment
Loss Contingencies [Line Items]
Accrued environmental liabilities	15		16
Possible material additional losses, above and beyond best estimate of required remediation costs	24
Energy Segment
Loss Contingencies [Line Items]
Accrued environmental liabilities	4		4
Environmental remediation expense	5	$ 5
RINs costs	(23)	$ (6)
Biofuel blending obligation	21		28
RINs asset	60
Railcar Segment
Loss Contingencies [Line Items]
Railcar loss contingency accrual	9
Metals Segment
Loss Contingencies [Line Items]
Accrued environmental liabilities	$ 28		$ 28
Icahn Enterprises G.P. | Mr. Icahn and affiliates
Loss Contingencies [Line Items]
Affiliate ownership in parent company general partner	100.00%

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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