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Commitments and Contingencies (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Loss Contingencies [Line Items]          
Accrued environmental liabilities $ 49   $ 49   $ 50
Defined benefit plan underfunded amount $ 452   $ 452   613
Mr. Icahn and affiliates          
Loss Contingencies [Line Items]          
Affiliate ownership interest     90.80%    
Starfire Holding Corporation          
Loss Contingencies [Line Items]          
Ownership percentage by Mr. Icahn 99.40%   99.40%    
Pension funding indemnity agreement with subsidiary $ 250   $ 250    
Automotive Segment          
Loss Contingencies [Line Items]          
Accrued environmental liabilities 15   15   16
Possible material additional losses, above and beyond best estimate of required remediation costs     40    
Energy Segment          
Loss Contingencies [Line Items]          
Accrued environmental liabilities 4   4   5
Environmental remediation expense 5 $ 7 12 $ 13  
RINs costs 64 $ 58 164 $ 152  
Biofuel blending obligation 185   185   186
Uncommitted biofuel blending obligation recognized at fair value 127   127   186
Railcar Segment          
Loss Contingencies [Line Items]          
Railcar loss contingency accrual 13   13    
Metals Segment          
Loss Contingencies [Line Items]          
Accrued environmental liabilities $ 28   $ 28   $ 28
Icahn Enterprises G.P. | Mr. Icahn and affiliates          
Loss Contingencies [Line Items]          
Affiliate ownership in parent company general partner     100.00%