Commitments and Contingencies Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Affiliate ownership interest	98.01%
Funded status of related party pension plan	$ (80)
Energy Segment
Loss Contingencies [Line Items]
Environmental loss contingency accrual	8	$ 4
Price of RINs	60	249	$ 206
Biofuel blending obligation	4	28
Metals Segment
Loss Contingencies [Line Items]
Environmental loss contingency accrual	27	28
Automotive Segment
Loss Contingencies [Line Items]
Environmental loss contingency accrual		16
Federal-Mogul
Loss Contingencies [Line Items]
Contribution to subsidiary	56
Federal-Mogul Products, Inc.
Loss Contingencies [Line Items]
Payment for litigation settlement agreement	$ 3
Mr. Icahn and affiliates
Loss Contingencies [Line Items]
Affiliate ownership interest	91.70%
Mr. Icahn and affiliates | Icahn Enterprises G.P.
Loss Contingencies [Line Items]
Affiliate ownership in parent company general partner	100.00%
Starfire Holding Corporation
Loss Contingencies [Line Items]
Ownership percentage by principal owner	99.60%
Pension funding indemnity agreement with subsidiary	$ 250
Accrued expenses and other liabilities
Loss Contingencies [Line Items]
Environmental loss contingency accrual	$ 37	$ 34