Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Mr. Icahn and affiliates
Loss Contingencies [Line Items]
Affiliate ownership interest	91.70%
ACF
Loss Contingencies [Line Items]
Defined benefit plan underfunded amount	$ 61
Starfire Holding Corporation
Loss Contingencies [Line Items]
Ownership percentage by Mr. Icahn	99.60%
Pension funding indemnity agreement with subsidiary	$ 250
Energy Segment
Loss Contingencies [Line Items]
RINs costs (benefit)	$ 13	$ (23)
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	$ 36		$ 37