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Commitments and Contingencies - Affiliate Pension Obligations (Details)
$ in Millions
Sep. 30, 2018
sponsor
Jul. 31, 2018
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Loss Contingencies [Line Items]        
Minimum ownership interest in CVR Energy by Mr. Icahn's affiliates 80.00%      
Number of sponsors of pension plans | sponsor 2      
IEP Energy LLC | Mr. Icahn's Affiliates        
Loss Contingencies [Line Items]        
Ownership percentage held by controlling stockholder 71.00% 82.00%    
Affiliate Pension Obligations        
Loss Contingencies [Line Items]        
Underfunded pension obligation, if ACF and Federal-Mogul plans were voluntarily terminated | $     $ 435 $ 424