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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 27, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2020
Dec. 31, 2021
Starfire Holding Corporation            
Loss Contingencies [Line Items]            
Ownership percentage by principal owner   99.60%   99.60%    
Pension funding indemnity agreement with subsidiary   $ 250.0   $ 250.0    
ACF            
Loss Contingencies [Line Items]            
Funded status of related party pension plan   44.0   $ 44.0    
Mr. Icahn and affiliates | Icahn Enterprises G.P.            
Loss Contingencies [Line Items]            
Affiliate ownership in parent company general partner       100.00%    
Mr. Icahn and affiliates | Icahn Enterprises Holdings            
Loss Contingencies [Line Items]            
Affiliate ownership interest       86.00%    
Energy Segment            
Loss Contingencies [Line Items]            
Environmental loss contingency accrual   23.0   $ 23.0   $ 12.0
Amount of quantifying alleged damages       6.8    
Price of RINs   86.0 $ 16.0 328.0 $ 335.0  
RFS position   715.0   715.0   494.0
Insurance policies coverage limits $ 50.0          
Energy Segment | Call option lawsuits            
Loss Contingencies [Line Items]            
Litigation settlement paid       79.0    
Accrued expenses and other liabilities            
Loss Contingencies [Line Items]            
Environmental loss contingency accrual   $ 24.0   24.0   $ 13.0
Accrued expenses and other liabilities | Energy Segment | Call option lawsuits            
Loss Contingencies [Line Items]            
Litigation settlement paid       $ 79.0