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Net Income (Loss) Per LP Unit (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Feb. 24, 2025
$ / shares
Dec. 31, 2024
USD ($)
item
$ / shares
shares
Dec. 31, 2023
USD ($)
item
$ / shares
shares
Dec. 31, 2022
USD ($)
item
$ / shares
shares
Nov. 06, 2024
USD ($)
Aug. 26, 2024
USD ($)
May 09, 2023
USD ($)
May 31, 2019
USD ($)
Net Income (Loss) Per LP Unit [Line Items]                
Net Income (Loss) | $   $ (445) $ (684) $ (183)        
Net (loss) income attributable to Icahn Enterprises allocated to limited partners (98.01% allocation) | $   $ (436) $ (670) $ (179)        
Basic loss per LP unit (in dollars per share) | $ / shares   $ (0.94) $ (1.75) $ (0.57)        
Basic weighted average LP units outstanding (in shares)   466,000,000 382,000,000 316,000,000        
Diluted loss per LP unit (in dollars per share) | $ / shares   $ (0.94) $ (1.75) $ (0.57)        
Diluted weighted average LP units outstanding (in shares)   466,000,000 382,000,000 316,000,000        
Limited partners: Depositary units issued   429,033,241 353,572,182          
Units distributed to LP unitholders   87,896,088 72,060,733          
Aggregate cash distributions to depositary unit holders | $   $ 383 $ 301          
Partners' Capital Account, Units, Sale of Units   5,806,986 3,395,353          
Limited partners: Depositary units issued   522,736,315 429,033,241 353,572,182        
Fixed-rate senior unsecured notes, repurchase program authorized amount | $         $ 500   $ 500  
Depositary units, repurchase program authorized amount | $         $ 500   $ 500  
Repurchased senior notes | $   $ 269            
2017 LTIP units vested     4,973          
Number of distributions | item   4 4 4        
Amount of distribution per share | $ / shares   $ 3.50 $ 6.00          
Aggregate gross sale proceeds | $               $ 400
Subsequent event                
Net Income (Loss) Per LP Unit [Line Items]                
Distribution declared per LP unit | $ / shares $ 0.50              
Open market sale agreement entered into November 2022                
Net Income (Loss) Per LP Unit [Line Items]                
Partners' Capital Account, Units, Sale of Units   5,806,986            
Proceeds from Sale of Interest in Partnership Unit | $   $ 102            
Aggregate gross sale proceeds | $   47            
Open market sale agreement entered into August 2024                
Net Income (Loss) Per LP Unit [Line Items]                
Sales of depositary units | $           $ 400    
Aggregate gross sale proceeds | $   400            
Limited partners                
Net Income (Loss) Per LP Unit [Line Items]                
Net (loss) income attributable to Icahn Enterprises allocated to limited partners (98.01% allocation) | $   $ (436) $ (670) $ (179)        
Units distributed to LP unitholders   87,896,088 72,060,733          
Mr. Icahn and affiliates                
Net Income (Loss) Per LP Unit [Line Items]                
Limited partners: Depositary units issued   367,879,902 299,997,624          
Units distributed to LP unitholders   82,908,268 67,882,278          
Aggregate cash distributions to depositary unit holders | $   $ 220 $ 70          
Limited partners: Depositary units issued   450,788,170 367,879,902 299,997,624        
Public unitholders                
Net Income (Loss) Per LP Unit [Line Items]                
Limited partners: Depositary units issued   61,153,339 53,574,558          
Units distributed to LP unitholders   4,987,820 4,178,455          
Partners' Capital Account, Units, Sale of Units   5,806,986 3,395,353          
Limited partners: Depositary units issued   71,948,145 61,153,339 53,574,558        
2017 LTIP units vested     4,973          
Icahn Enterprises Holdings LP                
Net Income (Loss) Per LP Unit [Line Items]                
Affiliate ownership interest   98.01% 98.01% 98.01%