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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Accounting Policies [Line Items]      
Total Assets $ 14,839   $ 16,279
Debt 6,713   6,809
Fair value of long-term debt 6,500   6,600
Restricted cash $ 2,672   2,636
Icahn Enterprises Holdings      
Accounting Policies [Line Items]      
Percentage of equity ownership in operating subsidiary 99.00%    
Cash held at consolidated affiliated partnerships      
Accounting Policies [Line Items]      
Restricted cash $ 691   915
Restricted cash      
Accounting Policies [Line Items]      
Restricted cash 2,000   1,700
Primary beneficiary      
Accounting Policies [Line Items]      
Total Assets 111   108
Energy      
Accounting Policies [Line Items]      
Total Assets 4,439   4,751
Debt 1,861   1,919
Remaining performance obligation expected to be recognized as revenue within one year 6    
Deferred revenue 33   78
Recorded revenue 47 $ 13  
Automotive Segment      
Accounting Policies [Line Items]      
Total Assets 1,829   1,939
Debt 25   31
Restricted cash 8   8
Deferred revenue 31   $ 37
Recorded revenue $ 11 $ 12  
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 $ 3    
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