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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 29, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
ACF | Railcar component purchases        
Related Party Transaction [Line Items]        
Expenses for transactions with related party   $ 2 $ 2  
ACF | Railcar component sales and royalties        
Related Party Transaction [Line Items]        
Related Party Transaction, Other Revenues from Transactions with Related Party   0 1  
ACF | Railcar repair services and support        
Related Party Transaction [Line Items]        
Related Party Transaction, Other Revenues from Transactions with Related Party   $ 1 1  
ACF | Purchase of railcars        
Related Party Transaction [Line Items]        
Expenses for transactions with related party     $ 12  
Mr. Icahn and affiliates        
Related Party Transaction [Line Items]        
Percentage fair value of investments in Funds that is attributable to Mr. Icahn   69.00% 69.00%  
Mr. Icahn and affiliates | Investment in funds        
Related Party Transaction [Line Items]        
Amount of transaction with related party   $ 600 $ 490  
Mr. Icahn and affiliates | Investment balance in funds        
Related Party Transaction [Line Items]        
Related party transaction, balance   4,200   $ 3,700
Consolidated VIE | Expense sharing arrangement        
Related Party Transaction [Line Items]        
Amount of transaction with related party   2 (12)  
Insight Portfolio Group LLC | Buying group operating expenses        
Related Party Transaction [Line Items]        
Expenses for transactions with related party   $ 1 $ 1  
ARL        
Related Party Transaction [Line Items]        
Equity issued to acquire additional interest in consolidated subsidiary (number of units) 685,367      
Percentage of equity ownership in operating subsidiary   100.00%