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(Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 27, 2018
Aug. 31, 2018
Jan. 31, 2018
Aug. 31, 2017
Jan. 31, 2017
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Oct. 22, 2018
Oct. 01, 2018
Description of Business [Line Items]                            
Gain on disposition of assets, net             $ 65 $ 446 $ 65 $ 1,969        
Proceeds from disposition of assets                 160 1,405        
Seller financing secured mortgages resulting from disposition of assets                 0 375        
Payments to acquire additional interest in subsidiaries                 $ 0 349        
Icahn Enterprises Holdings                            
Description of Business [Line Items]                            
Percentage of equity ownership in operating subsidiary                 99.00%          
Gain on disposition of assets, net             65 446 $ 65 1,969        
Proceeds from disposition of assets                 160 1,405        
Payments to acquire additional interest in subsidiaries                 0 $ 349        
Investment Funds                            
Description of Business [Line Items]                            
Fair value of interest in subsidiary             3,000   $ 3,000   $ 3,000      
Federal-Mogul                            
Description of Business [Line Items]                            
Percentage of equity ownership in operating subsidiary                 100.00%     82.00%    
Payments to acquire additional interest in subsidiaries         $ 305                  
CVR Refining                            
Description of Business [Line Items]                            
Percentage of equity ownership in operating subsidiary                 3.90%          
Common units validly tendered and not properly withdrawn (common units) 21,625,106                          
CVR Energy                            
Description of Business [Line Items]                            
Percentage of equity ownership in operating subsidiary 70.80%                          
Subsidiary common stock issued in exchange for additional interest in CVRR (shares) 13,699,549                          
ARI                            
Description of Business [Line Items]                            
Percentage of equity ownership in operating subsidiary                 62.20%          
Tropicana                            
Description of Business [Line Items]                            
Percentage of equity ownership in operating subsidiary                 83.90% 72.50%        
Subsidiary repurchase of treasury stock                 $ 36          
Payments to acquire additional interest in subsidiaries                 $ 95          
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                 78.60%   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                 91.50%          
Energy Segment                            
Description of Business [Line Items]                            
Gain on disposition of assets, net             0 (1) $ (5) $ (2)        
Energy Segment | CVR Refining                            
Description of Business [Line Items]                            
Percentage of equity ownership in operating subsidiary                 81.00%          
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]                            
Gain on disposition of assets, net             0 (10) $ 5 1,511        
Holding Company                            
Description of Business [Line Items]                            
Gain on disposition of assets, net             0 0 0 0        
Proceeds from disposition of assets                   1,300        
Food Packaging Segment                            
Description of Business [Line Items]                            
Gain on disposition of assets, net             0 0 0 0        
Food Packaging Segment | Viskase                            
Description of Business [Line Items]                            
Proceeds from subsidiary rights offering     $ 50                      
Payments for additional investment in subsidiary     $ 44                      
Real Estate Segment                            
Description of Business [Line Items]                            
Total consideration received from sale of asset   $ 139   $ 600                    
Gain on disposition of assets, net             $ 67 $ 456 $ 67 $ 456        
Proceeds from disposition of assets       225                    
Seller financing secured mortgages resulting from disposition of assets       375                    
Subsequent event | Federal-Mogul                            
Description of Business [Line Items]                            
Cash consideration to be received for business to be disposed of                           $ 800
Total equity consideration to be received for business to be disposed of (in shares)                           29,500,000
fair market value of shares obtained as consideration for business to be disposed of                           $ 1,200
Non-voting equity consideration to be received for business to be disposed of (in shares)                           23,800,000
consideration in voting shares for business to be disposed of                           5,700,000
investment, ownership percentage                           0.00%
Subsequent event | Tropicana                            
Description of Business [Line Items]                            
Aggregate consideration for business to be disposed of                           $ 1,800
Cash consideration to be received for business to be disposed of                           $ 1,500
Subsequent event | Federal-Mogul and Tropicana                            
Description of Business [Line Items]                            
Gain on disposition of assets, net           $ 1,000                
Subsequent event | Railcar Segment | ARI                            
Description of Business [Line Items]                            
Cash consideration to be received for business to be disposed of                         $ 831  
termination clause                         65  
Subsequent event | Railcar Segment | ITE Rail Fund L.P.                            
Description of Business [Line Items]                            
termination clause                         $ 130  
Dallas Property | Real Estate Segment                            
Description of Business [Line Items]                            
Gain on disposition of assets, net   $ 67                        
Fountainebleu | Real Estate Segment                            
Description of Business [Line Items]                            
Gain on disposition of assets, net       456                    
First Mortgage | Real Estate Segment                            
Description of Business [Line Items]                            
Seller financing secured mortgages resulting from disposition of assets       345                    
Second Mortgage | Real Estate Segment                            
Description of Business [Line Items]                            
Seller financing secured mortgages resulting from disposition of assets       $ 30