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(Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Entity Information [Line Items]    
Debt $ 12,182 $ 11,588
Fair value of long-term debt 12,200 11,600
Cash held at consolidated affiliated partnerships and restricted cash 1,441 1,435
Restricted cash [Member]    
Entity Information [Line Items]    
Cash held at consolidated affiliated partnerships and restricted cash $ 980 1,300
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 (in units) 114,551,382  
Affiliate ownership interest in Icahn Enterprises 88.80%  
Icahn Enterprises Holdings [Member]    
Entity Information [Line Items]    
Percentage of equity ownership in operating subsidiary 99.00%  
Debt $ 12,182 11,588
Cash held at consolidated affiliated partnerships and restricted cash $ 1,441 $ 1,435