Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Mr. Icahn and affiliates
Loss Contingencies [Line Items]
Affiliate ownership interest			92.00%
ACF
Loss Contingencies [Line Items]
Defined benefit plan underfunded amount	$ 61		$ 61
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	21	$ 50	$ 33	$ 27
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		$ 36		$ 37