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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Accounting Policies [Line Items]      
Total assets $ 17,443   $ 20,858
Debt 6,447   7,207
Fair value of long-term debt 6,300   6,900
Restricted cash $ 2,440   2,995
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 $ 808   1,068
Restricted cash      
Accounting Policies [Line Items]      
Restricted cash 1,632   1,927
Primary beneficiary      
Accounting Policies [Line Items]      
Total assets 107    
Energy      
Accounting Policies [Line Items]      
Total assets 4,382   5,259
Debt 1,582   2,185
Restricted cash     7
Remaining performance obligation for contracts with an original expected duration of more than one year 9    
Deferred revenue 68   49
Recorded revenue 14 $ 46  
Automotive Segment      
Accounting Policies [Line Items]      
Total assets 1,930   2,019
Debt 24   33
Restricted cash 6   9
Deferred revenue 39   $ 45
Recorded revenue 17 $ 15  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01 | Energy      
Accounting Policies [Line Items]      
Remaining performance obligation expected to be recognized as revenue within one year $ 1    
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    
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    
Remaining performance obligation for contracts with an original expected duration of more than one year 1 year