Segment Reporting - Condensed Balance Sheets (Details) - USD ($) $ in Millions	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	$ 2,488		$ 2,337
Cash held at consolidated affiliated partnerships and restricted cash	2,598		2,549
Investments	4,937		6,809
Accounts receivable, net	495		606
Inventories, net	1,015		1,531
Related party notes receivable	82
Note receivable, net	82
Property, plant and equipment, net	3,959		4,038
Goodwill and intangible assets, net	790		821
Other assets	5,850		9,223
Total assets	22,214		27,914
Accounts payable, accrued expenses and other liabilities	4,579		4,765
Securities sold, not yet purchased, at fair value	3,370		6,495
Debt	7,078		7,096
Total liabilities	15,027		18,356
Equity attributable to Icahn Enterprises	3,396		3,900
Equity attributable to non-controlling interests	3,791		5,658
Total equity	7,187	$ 8,496	9,558	$ 10,158	$ 9,758	$ 9,343
Total Liabilities and Equity	22,214		27,914
Investment Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	22		19
Cash held at consolidated affiliated partnerships and restricted cash	2,401		2,455
Investments	4,821		6,719
Other assets	4,644		8,041
Total assets	11,888		17,234
Accounts payable, accrued expenses and other liabilities	1,637		1,589
Securities sold, not yet purchased, at fair value	3,370		6,495
Total liabilities	5,007		8,084
Equity attributable to Icahn Enterprises	3,799		4,184
Equity attributable to non-controlling interests	3,082		4,966
Total equity	6,881		9,150
Total Liabilities and Equity	11,888		17,234
Energy Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	751		510
Cash held at consolidated affiliated partnerships and restricted cash	7		7
Investments	102		76
Accounts receivable, net	300		358
Inventories, net	524		624
Property, plant and equipment, net	2,630		2,664
Goodwill and intangible assets, net	189		200
Other assets	298		296
Total assets	4,801		4,735
Accounts payable, accrued expenses and other liabilities	1,727		1,823
Debt	1,591		1,591
Total liabilities	3,318		3,414
Equity attributable to Icahn Enterprises	795		648
Equity attributable to non-controlling interests	688		673
Total equity	1,483		1,321
Total Liabilities and Equity	4,801		4,735
Automotive Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	59		32
Cash held at consolidated affiliated partnerships and restricted cash	9		10
Accounts receivable, net	39		99
Inventories, net	260		686
Property, plant and equipment, net	792		826
Goodwill and intangible assets, net	346		352
Other assets	469		527
Total assets	1,974		2,532
Accounts payable, accrued expenses and other liabilities	847		981
Debt	19		21
Total liabilities	866		1,002
Equity attributable to Icahn Enterprises	1,108		1,530
Total equity	1,108		1,530
Total Liabilities and Equity	1,974		2,532
Food Packaging Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	7		9
Accounts receivable, net	90		87
Inventories, net	111		103
Property, plant and equipment, net	137		142
Goodwill and intangible assets, net	24		24
Other assets	104		110
Total assets	473		475
Accounts payable, accrued expenses and other liabilities	140		149
Debt	150		162
Total liabilities	290		311
Equity attributable to Icahn Enterprises	166		149
Equity attributable to non-controlling interests	17		15
Total equity	183		164
Total Liabilities and Equity	473		475
Real Estate Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	46		26
Cash held at consolidated affiliated partnerships and restricted cash	7		8
Investments	14		14
Accounts receivable, net	15		12
Property, plant and equipment, net	341		345
Other assets	96		102
Total assets	519		507
Accounts payable, accrued expenses and other liabilities	53		47
Debt	1		1
Total liabilities	54		48
Equity attributable to Icahn Enterprises	461		455
Equity attributable to non-controlling interests	4		4
Total equity	465		459
Total Liabilities and Equity	519		507
Home Fashion Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	5		5
Cash held at consolidated affiliated partnerships and restricted cash	3		3
Accounts receivable, net	27		24
Inventories, net	90		90
Property, plant and equipment, net	54		56
Goodwill and intangible assets, net	19		19
Other assets	17		16
Total assets	215		213
Accounts payable, accrued expenses and other liabilities	44		45
Debt	9		12
Total liabilities	53		57
Equity attributable to Icahn Enterprises	162		156
Total equity	162		156
Total Liabilities and Equity	215		213
Pharma Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	24		16
Accounts receivable, net	24		26
Inventories, net	30		28
Goodwill and intangible assets, net	212		226
Other assets	5		6
Total assets	295		302
Accounts payable, accrued expenses and other liabilities	58		61
Total liabilities	58		61
Equity attributable to Icahn Enterprises	237		241
Total equity	237		241
Total Liabilities and Equity	295		302
Holding Company
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	1,574		1,720
Cash held at consolidated affiliated partnerships and restricted cash	171		66
Related party notes receivable	82
Note receivable, net	82
Property, plant and equipment, net	5		5
Other assets	217		125
Total assets	2,049		1,916
Accounts payable, accrued expenses and other liabilities	73		70
Debt	5,308		5,309
Total liabilities	5,381		5,379
Equity attributable to Icahn Enterprises	(3,332)		(3,463)
Total equity	(3,332)		(3,463)
Total Liabilities and Equity	$ 2,049		$ 1,916