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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Accounting Policies [Line Items]          
Assets $ 27,901   $ 27,901   $ 24,989
Liabilities 17,876   17,876   15,731
Carrying value 8,065   8,065   8,059
Fair value of long-term debt 8,200   8,200   8,200
Cash held at consolidated affiliated partnerships and restricted cash 1,269   1,269   1,612
Cash held at consolidated affiliated partnerships          
Accounting Policies [Line Items]          
Cash held at consolidated affiliated partnerships and restricted cash 223   223   686
Restricted cash          
Accounting Policies [Line Items]          
Cash held at consolidated affiliated partnerships and restricted cash 1,046   1,046   926
Energy Segment          
Accounting Policies [Line Items]          
Assets 4,511   4,511   4,723
Liabilities 3,241   3,241   2,880
Carrying value 1,693   1,693   1,691
Cash held at consolidated affiliated partnerships and restricted cash 7   7   7
Deferred revenue 16   16   31
Recorded revenue 22 $ 21 30 $ 27  
Revenue, remaining performance obligation 6   6    
Revenue, current portion of remaining performance obligation 3   3    
Automotive Segment          
Accounting Policies [Line Items]          
Assets 2,933   2,933   3,085
Liabilities 1,417   1,417   1,531
Carrying value 342   342   368
Cash held at consolidated affiliated partnerships and restricted cash 18   18   20
Deferred revenue 41   41    
Recorded revenue 6 $ 7 12 $ 13  
Icahn Enterprises Holdings          
Accounting Policies [Line Items]          
Assets 27,901   27,901   24,989
Liabilities 17,877   17,877   15,733
Carrying value 8,066   8,066   8,061
Cash held at consolidated affiliated partnerships and restricted cash 1,269   1,269   1,612
Cash and cash equivalents | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Assets 49   49   31
Cash held at consolidated affiliated partnerships and restricted cash | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Assets 1,218   1,218   1,558
Investments. | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Assets 10,603   10,603   8,239
Due from brokers | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Assets 4,358   4,358   3,437
Accounts receivable, net | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Assets 35   35   37
Inventories, net | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Assets 50   50   42
Property, plant and equipment, net. | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Assets 1,007   1,007   1,042
Unrealized gain on derivative contracts | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Assets 679   679   785
Intangible assets, net | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Assets 222   222   232
Other assets. | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Assets 59   59   107
Accounts payable. | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Liabilities 30   30   25
Accrued expenses and other liabilities | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Liabilities 82   82   70
Deferred tax liabilities | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Liabilities 1   1   1
Unrealized loss on derivative contracts | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Liabilities 728   728   622
Securities sold, not yet purchased, at fair value | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Liabilities 4,231   4,231   2,521
Due to brokers | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Liabilities 1,528   1,528   1,618
Debt | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Liabilities $ 640   $ 640   $ 636
Icahn Enterprises Holdings          
Accounting Policies [Line Items]          
Percentage of equity ownership in operating subsidiary     99.00%    
Viskase | Variable Interest Entity, Primary Beneficiary          
Accounting Policies [Line Items]          
Percentage of equity ownership in operating subsidiary     50.00%