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Net Income Per LP Unit (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
May 02, 2018
Apr. 16, 2018
Feb. 27, 2018
Jan. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Earnings Per LP Unit [Line Items]            
Net income (loss) attributable to Icahn Enterprises         $ 137 $ (18)
Net income (loss) attributable to Icahn Enterprises allocable to limited partners (98.01% allocation)         $ 134 $ (18)
Basic income (loss) per LP unit         $ 0.77 $ (0.12)
Basic weighted average LP units outstanding         174,000,000 149,000,000
Diluted income (loss) per LP unit         $ 0.77 $ (0.12)
Diluted weighted average LP units outstanding         175,000,000 149,000,000
Units issued in connection with rights offering (value)       $ 600    
Distribution declared per LP unit     $ 1.75      
Distribution payable to LP unit holders         $ 310 $ 239
Restricted units vested during period (number of units)         15,071 672
Subsequent event            
Earnings Per LP Unit [Line Items]            
Distribution declared per LP unit $ 1.75          
Units distributed to LP unitholders   4,604,547        
Subsequent event | Mr. Icahn and affiliates            
Earnings Per LP Unit [Line Items]            
Units distributed to LP unitholders   4,543,846