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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Accounting Policies [Line Items]      
Total assets $ 21,757   $ 27,914
Debt 7,075   7,096
Fair value of long-term debt 6,400   6,600
Restricted cash $ 3,222   2,549
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 $ 1,172   1,019
Restricted cash      
Accounting Policies [Line Items]      
Restricted cash 2,050   1,530
Primary beneficiary      
Accounting Policies [Line Items]      
Total assets 100    
Energy Segment      
Accounting Policies [Line Items]      
Total assets 4,989   4,735
Debt 1,590   1,591
Restricted cash 7   7
Remaining performance obligation for contracts with an original expected duration of more than one year 2    
Deferred revenue 74   48
Recorded revenue 46 $ 86  
Automotive Segment      
Accounting Policies [Line Items]      
Total assets 2,009   2,532
Debt 24   21
Restricted cash 9   10
Deferred revenue 45   $ 44
Recorded revenue $ 15 $ 19