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Description of Business (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 19, 2016
USD ($)
Description of Business [Line Items]            
Payments to acquire additional interest in subsidiaries     $ 349,000,000 $ 2,000,000    
Proceeds from disposition of assets     1,461,000,000 20,000,000    
Gain (loss) on disposition of assets, net $ 446,000,000 $ (1,000,000) 1,966,000,000 10,000,000    
Seller financing secured mortgages resulting from disposition of assets     $ 375,000,000 0    
Icahn Enterprises Holdings            
Description of Business [Line Items]            
Percentage of equity ownership in operating subsidiary     99.00%      
Payments to acquire additional interest in subsidiaries     $ 349,000,000 2,000,000    
Proceeds from disposition of assets     1,461,000,000 20,000,000    
Gain (loss) on disposition of assets, net 446,000,000 (1,000,000) 1,966,000,000 10,000,000    
Investment Funds            
Description of Business [Line Items]            
Fair value of interest in subsidiary 2,900,000,000   $ 2,900,000,000   $ 1,700,000,000  
CVR Refining            
Description of Business [Line Items]            
Percentage of equity ownership in operating subsidiary     3.90%      
CVR Energy            
Description of Business [Line Items]            
Percentage of equity ownership in operating subsidiary     82.00%      
ARI            
Description of Business [Line Items]            
Percentage of equity ownership in operating subsidiary     62.20%      
Ferrous Resources            
Description of Business [Line Items]            
Percentage of equity ownership in operating subsidiary     77.20%      
Viskase            
Description of Business [Line Items]            
Percentage of equity ownership in operating subsidiary     74.60%      
Icahn Enterprises G.P.            
Description of Business [Line Items]            
General partner ownership percentage in Icahn Enterprises     1.00%      
General partner ownership interest in Icahn Enterprises Holdings     1.00%      
Aggregate general partner ownership interest of parent and operating subsidiary     1.99%      
Mr. Icahn and affiliates            
Description of Business [Line Items]            
Affiliate ownership interest in Icahn Enterprises     90.80%      
Gaming Segment            
Description of Business [Line Items]            
Gain (loss) on disposition of assets, net 0 0 $ (3,000,000) 0    
Gaming Segment | Tropicana            
Description of Business [Line Items]            
Percentage of equity ownership in operating subsidiary     83.90%      
Payments to acquire additional interest in subsidiaries     $ 95,000,000      
Subsidiary repurchase of treasury stock     36,000,000      
Automotive Segment            
Description of Business [Line Items]            
Gain (loss) on disposition of assets, net 1,000,000 (1,000,000) $ 4,000,000 8,000,000    
Automotive Segment | Federal-Mogul            
Description of Business [Line Items]            
Percentage of equity ownership in operating subsidiary     100.00%      
Payments to acquire additional interest in subsidiaries     $ 305,000,000      
Energy Segment            
Description of Business [Line Items]            
Gain (loss) on disposition of assets, net (1,000,000) (1,000,000) $ (2,000,000) (1,000,000)    
Energy Segment | CVR Refining            
Description of Business [Line Items]            
Percentage of equity ownership in operating subsidiary     66.00%      
Energy Segment | CVR Partners            
Description of Business [Line Items]            
Percentage of equity ownership in operating subsidiary     34.00%      
Railcar Segment            
Description of Business [Line Items]            
Value of business to be disposed of           $ 2,800,000,000
Estimated number of railcars to be disposed of (number of railcars)           29,000
Estimated number of additional railcars with option to sell (number of railcars)           4,551
Gain (loss) on disposition of assets, net (10,000,000) 1,000,000 $ 1,511,000,000 1,000,000    
Holding Company            
Description of Business [Line Items]            
Proceeds from disposition of assets     1,300,000,000      
Gain (loss) on disposition of assets, net 0 0 0 0    
Real Estate Segment            
Description of Business [Line Items]            
Total consideration received from sale of asset     600,000,000      
Proceeds from disposition of assets     225,000,000      
Gain (loss) on disposition of assets, net $ 456,000,000 $ 0 456,000,000 $ 1,000,000    
Seller financing secured mortgages resulting from disposition of assets     375,000,000      
First Mortgage | Real Estate Segment            
Description of Business [Line Items]            
Seller financing secured mortgages resulting from disposition of assets     345,000,000      
Second Mortgage | Real Estate Segment            
Description of Business [Line Items]            
Seller financing secured mortgages resulting from disposition of assets     $ 30,000,000