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Description of Business and Basis of Presentation (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Entity Information [Line Items]    
Debt $ 12,969 $ 12,594
Fair value of long-term debt 12,600 12,200
Cash held at consolidated affiliated partnerships and restricted cash 694 1,282
Restricted cash [Member]    
Entity Information [Line Items]    
Cash held at consolidated affiliated partnerships and restricted cash $ 507 966
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 89.50%  
Icahn Enterprises Holdings [Member]    
Entity Information [Line Items]    
Percentage of equity ownership in operating subsidiary 99.00%  
Debt $ 12,969 12,594
Cash held at consolidated affiliated partnerships and restricted cash 694 1,282
Debt [Member]    
Entity Information [Line Items]    
Affect on prior year financial statements from adopting new accounting principle   39
Energy Segment [Member]    
Entity Information [Line Items]    
Debt 1,168 667
Cash held at consolidated affiliated partnerships and restricted cash 0 0
Energy Segment [Member] | Cash and Cash Equivalents [Member]    
Entity Information [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 236 237
Energy Segment [Member] | Property, Plant and Equipment [Member]    
Entity Information [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 3,408 2,674
Energy Segment [Member] | Inventories    
Entity Information [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 325 290
Energy Segment [Member] | Goodwill    
Entity Information [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 0 574
Energy Segment [Member] | Intangible assets, net    
Entity Information [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 328 337
Energy Segment [Member] | Other assets    
Entity Information [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 94 102
Energy Segment [Member] | Accounts payable, accrued expenses and other liabilities [Member]    
Entity Information [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities 364 333
Energy Segment [Member] | Debt [Member]    
Entity Information [Line Items]    
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities $ 1,167 $ 667