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Description of Business and Basis of Presentation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
May 26, 2016
Apr. 01, 2016
Feb. 26, 2016
Feb. 04, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Entity Information [Line Items]                  
Impairment         $ 93 $ 6 $ 670 $ 10  
Cash held at consolidated affiliated partnerships and restricted cash         692   692   $ 1,282
Debt         12,971   12,971   12,594
Fair value of long-term debt         12,800   12,800   12,200
Restricted cash [Member]                  
Entity Information [Line Items]                  
Cash held at consolidated affiliated partnerships and restricted cash         569   $ 569   966
Icahn Enterprises G.P. [Member]                  
Entity Information [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 his affiliates [Member]                  
Entity Information [Line Items]                  
Affiliate ownership interest in Icahn Enterprises             89.70%    
Icahn Enterprises Holdings [Member]                  
Entity Information [Line Items]                  
Percentage of equity ownership in operating subsidiary             99.00%    
Impairment         93 6 $ 670 10  
Cash held at consolidated affiliated partnerships and restricted cash         692   692   1,282
Debt         12,971   $ 12,971   12,594
Debt                  
Entity Information [Line Items]                  
Affect on prior year financial statements from adopting new accounting principle                 39
Automotive Segment [Member]                  
Entity Information [Line Items]                  
Percentage of equity ownership in operating subsidiary             82.00%    
Impairment         1 6 $ 4 10  
Cash held at consolidated affiliated partnerships and restricted cash         4   4   0
Debt         3,338   3,338   3,135
Automotive Segment [Member] | Pep Boys [Member]                  
Entity Information [Line Items]                  
Consideration transferred to acquire business       $ 1,200          
Fair value of equity interest in acquiree just prior to obtaining a controlling interest       121          
Recognized net tangible assets from business combination       993          
Recognized goodwill and other intangible net assets from business combination       210          
Recognized unfavorable lease intangible liability from business combination       59          
Revenue of acquiree since acquisition date included in consolidated results             1,300    
Net income (loss) of acquiree attributable to Icahn Enterprises since acquisition date included in consolidated results             (8)    
Pro forma revenue             12,500 14,300  
Pro forma net income (loss)             (1,700) 9  
Pro forma net Income (loss) attributable to Icahn Enterprises             $ (963) $ (81)  
Pro forma basic income (loss) per LP unit             $ (6.99) $ (0.63)  
Pro forma diluted income (loss) per LP unit             $ (6.99) $ (0.63)  
Automotive Segment [Member] | Other acquisition [Member]                  
Entity Information [Line Items]                  
Consideration transferred to acquire business $ 25                
Recognized net tangible assets from business combination $ 25                
Energy Segment [Member]                  
Entity Information [Line Items]                  
Impairment         0 0 $ 574 $ 0  
Cash held at consolidated affiliated partnerships and restricted cash         0   0   0
Debt         1,167   1,167   667
Energy Segment [Member] | CVR Nitrogen [Member]                  
Entity Information [Line Items]                  
Consideration transferred to acquire business   $ 440              
Recognized net tangible assets from business combination   $ 440              
Subsidiary units issued to acquire entity   40.2              
Value of equity interest in subsidiary issued to acquire business   $ 336              
Payments to acquire businesses   99              
Liabilities of acquiree incurred from business combination   368              
Debt   320              
Intercompany debt, face amount   $ 320              
Energy Segment [Member] | Cash and Cash Equivalents [Member]                  
Entity Information [Line Items]                  
VIE Carrying amount of assets         351   351   237
Energy Segment [Member] | Property, Plant and Equipment [Member]                  
Entity Information [Line Items]                  
VIE Carrying amount of assets         3,365   3,365   2,674
Energy Segment [Member] | Inventories                  
Entity Information [Line Items]                  
VIE Carrying amount of assets         323   323   290
Energy Segment [Member] | Goodwill                  
Entity Information [Line Items]                  
VIE Carrying amount of assets         0   0   574
Energy Segment [Member] | Intangible assets, net                  
Entity Information [Line Items]                  
VIE Carrying amount of assets         323   323   337
Energy Segment [Member] | Other assets                  
Entity Information [Line Items]                  
VIE Carrying amount of assets         79   79   115
Energy Segment [Member] | Accounts payable, accrued expenses and other liabilities [Member]                  
Entity Information [Line Items]                  
VIE Carrying amount of liabilities         436   436   333
Energy Segment [Member] | Debt                  
Entity Information [Line Items]                  
VIE Carrying amount of liabilities         1,167   1,167   667
Gaming Segment [Member]                  
Entity Information [Line Items]                  
Impairment         92 $ 0 92 $ 0  
Cash held at consolidated affiliated partnerships and restricted cash         13   13   14
Debt         $ 287   $ 287   $ 289
Gaming Segment [Member] | Trump [Member]                  
Entity Information [Line Items]                  
Fair value of equity interest in acquiree just prior to obtaining a controlling interest     $ 126            
Gain on remeasuring fair value of equity interest in acquiree just prior to obtaining a controlling interest     16            
Recognized net tangible assets from business combination     112            
Recognized goodwill and other intangible net assets from business combination       $ 14          
Face value of pre-petition debt     $ 286