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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Accounting Policies [Line Items]      
Total assets $ 17,988   $ 20,858
Debt 6,625   7,207
Fair value of long-term debt 6,400   6,900
Restricted cash $ 3,442   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 $ 1,631   1,068
Restricted cash      
Accounting Policies [Line Items]      
Restricted cash 1,811   1,927
Primary beneficiary      
Accounting Policies [Line Items]      
Total assets 106    
Energy      
Accounting Policies [Line Items]      
Total assets 4,522   5,259
Debt 1,584   2,185
Restricted cash     7
Remaining performance obligation for contracts with an original expected duration of more than one year 32    
Deferred revenue 38   49
Recorded revenue 13 $ 46  
Automotive Segment      
Accounting Policies [Line Items]      
Total assets 1,964   2,019
Debt 27   33
Restricted cash 7   9
Deferred revenue 42   $ 45
Recorded revenue 12 $ 13  
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 $ 8    
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 $ 11    
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 expected to be recognized as revenue within one year $ 10    
Remaining performance obligation for contracts with an original expected duration of more than one year 1 year