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Commitments and Contingencies (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Loss Contingencies [Line Items]          
Defined benefit plan underfunded amount $ 435   $ 435   $ 424
Mr. Icahn and affiliates          
Loss Contingencies [Line Items]          
Affiliate ownership interest     91.30%    
Starfire Holding Corporation          
Loss Contingencies [Line Items]          
Ownership percentage by Mr. Icahn 99.40%   99.40%    
Pension funding indemnity agreement with subsidiary $ 250   $ 250    
Energy Segment          
Loss Contingencies [Line Items]          
RINs costs 50 $ 106 27 $ 99  
Biofuel blending obligation 16   16   28
RINs asset 14   14    
Railcar Segment          
Loss Contingencies [Line Items]          
Railcar loss contingency accrual 9   $ 9    
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 38   $ 38   $ 34
Liabilities held for sale [Member]          
Loss Contingencies [Line Items]          
Accrued environmental liabilities $ 15   $ 15