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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 29, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Mr. Icahn and his affiliates [Member]            
Related Party Transaction [Line Items]            
Investment in funds       $ 490 $ 245  
Icahn Capital [Member] | Expense sharing agreement [Member]            
Related Party Transaction [Line Items]            
Expenses charged by related party   $ 19 $ 130 $ 7 228  
Investment Funds [Member] | Mr. Icahn and his affiliates [Member]            
Related Party Transaction [Line Items]            
Percentage fair value of investments in Funds that is attributable to Mr. Icahn       69.00%   55.00%
Investment Funds [Member] | Mr. Icahn and his affiliates [Member] | Investment in Funds [Member]            
Related Party Transaction [Line Items]            
Related party transaction, balance   3,800   $ 3,800   $ 4,100
ARI [Member]            
Related Party Transaction [Line Items]            
Percentage of equity ownership in operating subsidiary       61.20%    
ARI [Member] | ACF [Member] | Railcar Sales [Member]            
Related Party Transaction [Line Items]            
Revenues from transactions with related party   1 4 $ 1 6  
ARI [Member] | ACF [Member] | Railcar repair services and support [Member] [Member]            
Related Party Transaction [Line Items]            
Revenues from transactions with related party   1 0 1 0  
ARI [Member] | ACF [Member] | Railcar component sales [Member]            
Related Party Transaction [Line Items]            
Revenues from transactions with related party   1 7 $ 3 9  
ARL [Member]            
Related Party Transaction [Line Items]            
Percentage of equity ownership in operating subsidiary       100.00%    
ARL [Member] | ACF [Member] | Railcar Sales [Member]            
Related Party Transaction [Line Items]            
Expenses from transactions with related party   $ 2 $ 21 $ 14 27  
Railcar Segment [Member] | ARL [Member]            
Related Party Transaction [Line Items]            
LP units issued as consideration for acquisition 685,367          
Agreements with ACF [Member] | ARL [Member] | ACF [Member] | Railcar Sales [Member]            
Related Party Transaction [Line Items]            
Expenses from transactions with related party       $ 0 $ 9