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Net Income Per LP Unit (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 15, 2017
Aug. 02, 2017
Jun. 13, 2017
May 03, 2017
Apr. 18, 2017
Feb. 27, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per LP Unit [Line Items]                    
Net income (loss) attributable to Icahn Enterprises             $ 597 $ (16) $ 2,132 $ (922)
Net income (loss) attributable to Icahn Enterprises allocable to limited partners (98.01% allocation)             $ 586 $ (16) $ 2,090 $ (904)
Basic income (loss) per LP unit             $ 3.53 $ (0.12) $ 13.23 $ (6.70)
Basic weighted average LP units outstanding             166,000,000 139,000,000 158,000,000 135,000,000
Diluted income (loss) per LP unit             $ 3.53 $ (0.12) $ 13.23 $ (6.70)
Diluted weighted average LP units outstanding             166,000,000 139,000,000 158,000,000 135,000,000
Units issued in connection with rights offering (number of units)                 11,171,104  
Units issued in connection with rights offering (value)                 $ 600  
Distribution declared per LP unit   $ 1.50   $ 1.50   $ 1.50        
Units distributed to LP unitholders 4,272,982   4,556,977   4,335,685          
Restricted units vested during period (number of units)             2,388   5,418  
Mr. Icahn and affiliates                    
Earnings Per LP Unit [Line Items]                    
Units issued in connection with rights offering (number of units)                 10,525,105