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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Accounting Policies [Line Items]          
Total Assets $ 14,826 $ 14,826 $ 14,826   $ 16,279
Debt 6,688 6,688 6,688   6,809
Fair value of long-term debt 6,600 6,600 6,600   6,600
Restricted cash 2,238 2,238 $ 2,238   2,636
TEB LLC [Member]          
Accounting Policies [Line Items]          
Carrying Value Equity Method Investment 74        
Carrying Value Of Equity Investment And Related Party Loan Receivable 198        
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 471 471 $ 471   915
Restricted cash          
Accounting Policies [Line Items]          
Restricted cash 1,800 1,800 1,800   1,700
Primary beneficiary          
Accounting Policies [Line Items]          
Total Assets 112 112 112   108
Energy          
Accounting Policies [Line Items]          
Total Assets 4,430 4,430 4,430   4,751
Debt 1,841 1,841 1,841   1,919
Remaining performance obligation expected to be recognized as revenue within one year 5 5 5    
Deferred revenue 58 58 58   78
Recorded revenue     49 $ 14  
Carrying value of property, plant and equipment     93    
Energy | Service life          
Accounting Policies [Line Items]          
Depreciation related to property, plant and equipment   31      
Automotive Segment          
Accounting Policies [Line Items]          
Total Assets 1,805 1,805 1,805   1,939
Debt 22 22 22   31
Restricted cash 8 8 8   8
Deferred revenue $ 29 $ 29 29   $ 37
Recorded revenue     $ 17 $ 17  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01          
Accounting Policies [Line Items]          
Remaining performance obligation for contracts with an original expected duration of more than one year 3 months 3 months 3 months    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 | Energy          
Accounting Policies [Line Items]          
Remaining performance obligation expected to be recognized as revenue within one year $ 2 $ 2 $ 2    
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 1 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 $ 3 $ 3