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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Accounting Policies [Line Items]
Assets	$ 28,297		$ 24,985
Liabilities	18,715		15,727
Carrying value	8,056		8,059
Fair value of long-term debt	8,100		8,200
Cash held at consolidated affiliated partnerships and restricted cash	1,134		1,612
Cash held at consolidated affiliated partnerships
Accounting Policies [Line Items]
Cash held at consolidated affiliated partnerships and restricted cash	142		686
Restricted cash
Accounting Policies [Line Items]
Cash held at consolidated affiliated partnerships and restricted cash	992		926
Energy Segment
Accounting Policies [Line Items]
Assets	4,917		4,723
Liabilities	3,141		2,880
Carrying value	1,691		1,691
Cash held at consolidated affiliated partnerships and restricted cash	7		7
Deferred revenue	40		31
Recorded revenue	8	$ 6
Revenue, remaining performance obligation	6
Revenue, current portion of remaining performance obligation	3
Automotive Segment
Accounting Policies [Line Items]
Assets	3,063		3,085
Liabilities	1,505		1,531
Carrying value	352		368
Cash held at consolidated affiliated partnerships and restricted cash	18		20
Deferred revenue	40		41
Recorded revenue	6	$ 6
Real Estate Segment
Accounting Policies [Line Items]
Assets	494		486
Liabilities	51		46
Carrying value	1		1
Cash held at consolidated affiliated partnerships and restricted cash	10		8
Food Packaging Segment
Accounting Policies [Line Items]
Assets	471		487
Liabilities	319		333
Carrying value	156		151
Icahn Enterprises Holdings
Accounting Policies [Line Items]
Assets	28,297		24,985
Liabilities	18,717		15,729
Carrying value	8,058		8,061
Cash held at consolidated affiliated partnerships and restricted cash	1,134		1,612
Cash and cash equivalents | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Assets	64		31
Cash held at consolidated affiliated partnerships and restricted cash | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Assets	1,078		1,558
Investments. | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Assets	10,926		8,239
Due from brokers | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Assets	4,234		3,437
Accounts receivable, net | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Assets	15		37
Inventories, net | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Assets	57		42
Property, plant and equipment, net. | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Assets	1,025		1,042
Unrealized gain on derivative contracts | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Assets	849		785
Intangible assets, net | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Assets	227		232
Other assets. | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Assets	124		107
Accounts payable. | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Liabilities	22		25
Accrued expenses and other liabilities | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Liabilities	151		70
Deferred tax liabilities | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Liabilities	1		1
Unrealized loss on derivative contracts | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Liabilities	521		622
Securities sold, not yet purchased, at fair value | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Liabilities	4,863		2,521
Due to brokers | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Liabilities	1,509		1,618
Debt | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary
Accounting Policies [Line Items]
Liabilities	$ 637		$ 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%

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