Segment Reporting - Condensed Balance Sheets (Details) - USD ($) $ in Millions	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	$ 2,453		$ 2,321
Cash held at consolidated affiliated partnerships and restricted cash	4,216		2,115
Investments	5,812		9,151
Accounts receivable, net	728		546
Inventories, net	1,787		1,478
Property, plant and equipment, net	4,043		4,085
Goodwill and intangible assets, net	851		885
Other assets	7,005		7,165
Total Assets	26,895		27,746
Accounts payable, accrued expenses and other liabilities	5,541		5,371
Securities sold, not yet purchased, at fair value	4,062		5,340
Debt	7,134		7,692
Total liabilities	16,737		18,403
Equity attributable to Icahn Enterprises	4,027		3,544
Equity attributable to non-controlling interests	6,131		5,799
Total equity	10,158	$ 9,758	9,343	$ 10,025	$ 9,582	$ 9,258
Total Liabilities and Equity	26,895		27,746
Investment Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	21		19
Cash held at consolidated affiliated partnerships and restricted cash	4,117		2,008
Investments	5,720		8,952
Other assets	5,988		6,156
Total Assets	15,846		17,135
Accounts payable, accrued expenses and other liabilities	1,988		2,405
Securities sold, not yet purchased, at fair value	4,062		5,340
Total liabilities	6,050		7,745
Equity attributable to Icahn Enterprises	4,469		4,271
Equity attributable to non-controlling interests	5,327		5,119
Total equity	9,796		9,390
Total Liabilities and Equity	15,846		17,135
Energy Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	893		510
Cash held at consolidated affiliated partnerships and restricted cash	7		7
Investments	77		79
Accounts receivable, net	418		299
Inventories, net	722		484
Property, plant and equipment, net	2,692		2,735
Goodwill and intangible assets, net	210		221
Other assets	301		252
Total Assets	5,320		4,587
Accounts payable, accrued expenses and other liabilities	2,112		1,579
Debt	1,594		1,660
Total liabilities	3,706		3,239
Equity attributable to Icahn Enterprises	828		686
Equity attributable to non-controlling interests	786		662
Total equity	1,614		1,348
Total Liabilities and Equity	5,320		4,587
Automotive Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	35		28
Cash held at consolidated affiliated partnerships and restricted cash	15		17
Accounts receivable, net	146		103
Inventories, net	835		780
Property, plant and equipment, net	801		786
Goodwill and intangible assets, net	357		362
Other assets	472		506
Total Assets	2,661		2,582
Accounts payable, accrued expenses and other liabilities	1,041		981
Debt	18		26
Total liabilities	1,059		1,007
Equity attributable to Icahn Enterprises	1,602		1,575
Total equity	1,602		1,575
Total Liabilities and Equity	2,661		2,582
Food Packaging Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	8		10
Accounts receivable, net	91		82
Inventories, net	102		93
Property, plant and equipment, net	138		147
Goodwill and intangible assets, net	25		27
Other assets	98		99
Total Assets	462		458
Accounts payable, accrued expenses and other liabilities	146		146
Debt	162		155
Total liabilities	308		301
Equity attributable to Icahn Enterprises	140		143
Equity attributable to non-controlling interests	14		14
Total equity	154		157
Total Liabilities and Equity	462		458
Real Estate Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	30		30
Cash held at consolidated affiliated partnerships and restricted cash	11		11
Investments	15		15
Accounts receivable, net	11		10
Property, plant and equipment, net	349		351
Other assets	103		109
Total Assets	519		526
Accounts payable, accrued expenses and other liabilities	55		49
Debt	1		1
Total liabilities	56		50
Equity attributable to Icahn Enterprises	459		472
Equity attributable to non-controlling interests	4		4
Total equity	463		476
Total Liabilities and Equity	519		526
Home Fashion Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	3		3
Accounts receivable, net	40		32
Inventories, net	110		106
Property, plant and equipment, net	57		60
Goodwill and intangible assets, net	19		21
Other assets	19		21
Total Assets	248		243
Accounts payable, accrued expenses and other liabilities	62		71
Debt	49		40
Total liabilities	111		111
Equity attributable to Icahn Enterprises	137		132
Total equity	137		132
Total Liabilities and Equity	248		243
Pharma Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	17		14
Accounts receivable, net	22		20
Inventories, net	18		15
Goodwill and intangible assets, net	240		254
Other assets	5		6
Total Assets	302		309
Accounts payable, accrued expenses and other liabilities	51		50
Total liabilities	51		50
Equity attributable to Icahn Enterprises	251		259
Total equity	251		259
Total Liabilities and Equity	302		309
Holding Company
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	1,446		1,707
Cash held at consolidated affiliated partnerships and restricted cash	66		72
Investments			105
Property, plant and equipment, net	6		6
Other assets	19		16
Total Assets	1,537		1,906
Accounts payable, accrued expenses and other liabilities	86		90
Debt	5,310		5,810
Total liabilities	5,396		5,900
Equity attributable to Icahn Enterprises	(3,859)		(3,994)
Total equity	(3,859)		(3,994)
Total Liabilities and Equity	$ 1,537		$ 1,906