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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Feb. 29, 2024
Accounting Policies [Line Items]          
Total Assets $ 20,858 $ 16,279 $ 20,858    
Assets held for sale   25      
Debt 7,207 6,809 7,207    
Fair value of long-term debt 6,900 6,600 6,900    
Restricted cash 2,995 2,636 2,995    
Portion of inventory under LIFO method 228 168 228    
Post-retirement benefit liability 34 25 34    
Accumulated other comprehensive loss 55 61 55    
Impairment     7    
Cash and cash equivalents 2,951 $ 2,603 2,951    
Aggregate general partner ownership interest of parent and operating subsidiary   1.99%      
Discontinued Operations, Held-for-Sale          
Accounting Policies [Line Items]          
Assets held for sale   $ 25      
Icahn Enterprises G.P.          
Accounting Policies [Line Items]          
Aggregate general partner ownership interest of parent and operating subsidiary   1.99%      
Affiliate ownership interest   98.01%      
Icahn Enterprises Holdings          
Accounting Policies [Line Items]          
Percentage of equity ownership in operating subsidiary   99.00%      
Affiliate ownership interest   99.00%      
Cash held at consolidated affiliated partnerships          
Accounting Policies [Line Items]          
Restricted cash 1,100 $ 900 1,100    
Restricted cash          
Accounting Policies [Line Items]          
Restricted cash 1,900 1,700 1,900    
Primary beneficiary          
Accounting Policies [Line Items]          
Total Assets   108      
Energy          
Accounting Policies [Line Items]          
Total Assets 5,259 4,751 5,259    
Debt 2,185 1,919 2,185    
Restricted cash 7   7    
Deferred revenue $ 49 78 49    
Recorded revenue   16 $ 46 $ 86  
Remaining performance obligation expected to be recognized as revenue within one year   $ 8      
Useful lives of the assets 5 years 4 months 24 days 5 years 4 months 24 days 5 years 4 months 24 days    
Cash and cash equivalents $ 1,179 $ 987 $ 1,179    
Energy | 5.25% senior unsecured notes due 2025          
Accounting Policies [Line Items]          
Interest rate on debt instrument (in percent) 5.25%   5.25%   5.25%
Energy | Reserved Funds          
Accounting Policies [Line Items]          
Cash and cash equivalents $ 598   $ 598    
Energy | Minimum | Refineries          
Accounting Policies [Line Items]          
Turnaround Term of Plants   4 years      
Energy | Maximum | Refineries          
Accounting Policies [Line Items]          
Turnaround Term of Plants   5 years      
Energy | Maximum | Nitrogen Fertilizer Plants          
Accounting Policies [Line Items]          
Turnaround Term of Plants   3 years      
Automotive Segment          
Accounting Policies [Line Items]          
Total Assets 2,019 $ 1,939 2,019    
Debt 33 31 33    
Restricted cash 9 8 9    
Deferred revenue 45 37 45    
Recorded revenue   $ 22 $ 22 $ 25  
Impairment $ 7        
Useful lives of the assets 5 years 4 months 24 days 5 years 4 months 24 days 5 years 4 months 24 days    
Cash and cash equivalents $ 104 $ 133 $ 104    
Real Estate and Automotive | Minimum          
Accounting Policies [Line Items]          
Useful lives of the assets   5 years      
Real Estate and Automotive | Maximum          
Accounting Policies [Line Items]          
Useful lives of the assets   39 years      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01          
Accounting Policies [Line Items]          
Remaining performance obligation for contracts with an original expected duration of more than one year   1 year      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Energy          
Accounting Policies [Line Items]          
Remaining performance obligation expected to be recognized as revenue within one year   $ 4      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01          
Accounting Policies [Line Items]          
Remaining performance obligation for contracts with an original expected duration of more than one year   1 year      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | Energy          
Accounting Policies [Line Items]          
Remaining performance obligation for contracts with an original expected duration of more than one year   $ 3