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Net Income Per LP Unit (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
 [1]
Sep. 30, 2017
 [1]
Jun. 30, 2017
 [1]
Mar. 31, 2017
 [1]
Dec. 31, 2016
 [1]
Sep. 30, 2016
 [1]
Jun. 30, 2016
 [1]
Mar. 31, 2016
 [1]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per LP Unit [Line Items]                      
Net income (loss) attributable to Icahn Enterprises $ 298 $ 597 $ 1,553 $ (18) $ (206) $ (16) $ (69) $ (837) $ 2,430 $ (1,128) $ (1,194)
Net loss attributable to Icahn Enterprises allocable to limited partners (98.01% allocation)                 $ 2,382 $ (1,106) $ (1,170)
Basic income (loss) per LP unit $ 1.72 $ 3.53 $ 9.51 $ (0.12) $ (1.42) $ (0.12) $ (0.50) $ (6.21) $ 14.80 $ (8.07) $ (9.29)
Basic weighted average LP units outstanding                 161,000,000 137,000,000 126,000,000
Diluted income (loss) per LP unit $ 1.72 $ 3.53 $ 9.51 $ (0.12) $ (1.42) $ (0.12) $ (0.50) $ (6.21) $ 14.80 $ (8.07) $ (9.29)
Diluted weighted average LP units outstanding                 161,000,000 137,000,000 126,000,000
Depositary units issued (number of units)                 11,171,104    
Depositary units issued (value)                 $ 600    
Distribution declared per unit                 $ 6.00    
Units distributed to LP unitholders                 17,644,152    
2017 LTIP units vested                 7,902    
Mr. Icahn and affiliates                      
Earnings Per LP Unit [Line Items]                      
Depositary units issued (number of units)                 10,525,105    
Units distributed to LP unitholders                 17,374,427    
[1] The comparability of our quarterly financial data is affected by, among other things, (i) the performance of the Investment Funds, (ii) various acquisitions, primarily the acquisition of Pep Boys during the first quarter of 2016, (iii) certain dispositions of assets, primarily during the second and fourth quarters of 2017, (iv) impairment charges and (v) the enactment of U.S. tax law changes in the fourth quarter of 2017.