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Commitments and Contingencies Commitments and Contingencies (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 25, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]        
Funded status of the plan   $ (613) $ (589)  
2017   245    
2018   225    
2019   183    
2020   155    
2021   130    
Thereafter   356    
Future minimum payments due on operating leases   1,294    
Rent expense   237 145 $ 112
Automotive Segment        
Loss Contingencies [Line Items]        
Environmental loss contingency accrual   16 14  
Estimate of additional remediation costs   41    
Asset retirement obligations   21 16  
Railcar Segment        
Loss Contingencies [Line Items]        
Litigation claim gain amount $ 25      
Litigation counterclaim amount $ 10      
Railcar loss contingency accrual   16    
Metals Segment        
Loss Contingencies [Line Items]        
Environmental loss contingency accrual   28 $ 29  
ARL | Railcar Segment        
Loss Contingencies [Line Items]        
Future minimum payments due on operating leases   $ 17    
Mr. Icahn and affiliates        
Loss Contingencies [Line Items]        
Affiliate ownership interest   89.80%    
Mr. Icahn and affiliates | Icahn Enterprises G.P.        
Loss Contingencies [Line Items]        
Affiliate ownership in parent company general partner   100.00%    
Starfire Holding Corporation [Member]        
Loss Contingencies [Line Items]        
Ownership percentage by principal owner   99.40%    
Pension funding indemnity agreement with subsidiary   $ 250