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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Accounting Policies [Line Items]      
Total assets $ 22,214   $ 27,914
Debt 7,078   7,096
Fair value of long-term debt 6,300   6,600
Restricted cash 2,598   2,549
Accumulated other comprehensive loss $ 63   70
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 $ 367   1,019
Restricted cash      
Accounting Policies [Line Items]      
Restricted cash 2,231   1,530
Primary beneficiary      
Accounting Policies [Line Items]      
Total assets 100    
Energy Segment      
Accounting Policies [Line Items]      
Total assets 4,801   4,735
Debt 1,591   1,591
Restricted cash 7   7
Remaining performance obligation for contracts with an original expected duration of more than one year 2    
Deferred revenue 44   48
Recorded revenue 46 $ 84  
Automotive Segment      
Accounting Policies [Line Items]      
Total assets 1,974   2,532
Debt 19   21
Restricted cash 9   10
Deferred revenue 44   $ 44
Recorded revenue $ 13 $ 12