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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 29, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Mr. Icahn and affiliates            
Related Party Transaction [Line Items]            
Percentage fair value of investments in Funds that is attributable to Mr. Icahn   61.00%   61.00%   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   $ 4,300   4,300   $ 3,700
Consolidated VIE | Expense sharing arrangement            
Related Party Transaction [Line Items]            
Amount of transaction with related party   3 $ 19 5 7  
Equity method investee | Passenger vehicle services            
Related Party Transaction [Line Items]            
Amount of transaction with related party   3   5    
Insight Portfolio Group LLC | Buying group operating expenses            
Related Party Transaction [Line Items]            
Expenses for transactions with related party   $ 1 $ 1 $ 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%