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Description of Business (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2019
Jan. 29, 2019
Oct. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Description of Business [Line Items]                
Purchase of additional interests in consolidated subsidiaries           $ 0 $ (241)  
Proceeds from disposition of businesses and assets           23 491  
Gain on disposition of assets, net       $ 7 $ 249 $ 5 256  
Icahn Enterprises Holdings                
Description of Business [Line Items]                
Percentage of equity ownership in operating subsidiary     89.00%     99.00%    
CVR Refining                
Description of Business [Line Items]                
Percentage of equity ownership in operating subsidiary           35.00%    
Viskase                
Description of Business [Line Items]                
Percentage of equity ownership in operating subsidiary           78.60%    
Viskase | Private Placement                
Description of Business [Line Items]                
Percentage of equity ownership in operating subsidiary     89.00%          
Common stock shares acquired     50,000,000          
Amount of common stock shares acquired     $ 100          
Icahn Enterprises Holdings                
Description of Business [Line Items]                
Purchase of additional interests in consolidated subsidiaries           $ 0 (241)  
Proceeds from disposition of businesses and assets           23 491  
Gain on disposition of assets, net       7 249 5 256  
Investment Funds                
Description of Business [Line Items]                
Fair value of interest in subsidiary       4,100   $ 4,100   $ 4,300
Icahn Enterprises G.P.                
Description of Business [Line Items]                
Aggregate general partner ownership interest of parent and operating subsidiary           1.99%    
Icahn Enterprises G.P. | Icahn Enterprises Holdings                
Description of Business [Line Items]                
General partner ownership percentage in Icahn Enterprises           1.00%    
Mr. Icahn and affiliates | Icahn Enterprises Holdings                
Description of Business [Line Items]                
Affiliate ownership interest in Icahn Enterprises           92.00%    
Energy Segment                
Description of Business [Line Items]                
Gain on disposition of assets, net       0 (3) $ (2) 5  
Energy Segment | CVR Refining                
Description of Business [Line Items]                
Percentage of equity ownership in operating subsidiary   3.90%            
Energy Segment | CVR Energy                
Description of Business [Line Items]                
Percentage of equity ownership in operating subsidiary   80.60%       70.80%    
Energy Segment | CVR Refining                
Description of Business [Line Items]                
Purchase of additional interests in consolidated subsidiaries   $ 241            
Food Packaging Segment                
Description of Business [Line Items]                
Gain on disposition of assets, net       0 0 $ 0 0  
Real Estate Segment                
Description of Business [Line Items]                
Gain on disposition of assets, net       7 0 7 0  
Mining segment                
Description of Business [Line Items]                
Gain on disposition of assets, net       $ 0 252 $ 0 $ 252  
Mining segment | Ferrous Resources                
Description of Business [Line Items]                
Percentage of equity ownership in operating subsidiary 77.20%              
Mining segment | Ferrous Resources                
Description of Business [Line Items]                
Proceeds from disposition of businesses and assets         451      
Gain on disposition of assets, net         $ 252