Commitments and Contingencies Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Affiliate ownership interest	98.01%
Energy Segment
Loss Contingencies [Line Items]
Environmental loss contingency accrual	$ 6	$ 8
Price of RINs	43	60	$ 249
Biofuel blending obligation	7	4
Metals Segment
Loss Contingencies [Line Items]
Environmental loss contingency accrual	$ 27	27
Mr. Icahn and affiliates
Loss Contingencies [Line Items]
Affiliate ownership interest	92.00%
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
ACF
Loss Contingencies [Line Items]
Funded status of related party pension plan	(71)
Accrued expenses and other liabilities
Loss Contingencies [Line Items]
Environmental loss contingency accrual	$ 34	$ 37