Segment Reporting - Condensed Balance Sheets (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	$ 2,608	$ 2,337
Cash held at consolidated affiliated partnerships and restricted cash	2,481	2,549
Investments	6,637	6,809
Accounts receivable, net	527	606
Inventories, net	1,097	1,531
Related party notes receivable, net	207
Property, plant and equipment, net	3,986	4,038
Goodwill and intangible assets, net	805	821
Other assets	7,921	9,223
Total Assets	26,269	27,914
Accounts payable, accrued expenses and other liabilities	5,028	4,765
Securities sold, not yet purchased, at fair value	5,654	6,495
Debt	7,091	7,096
Total liabilities	17,773	18,356
Equity attributable to Icahn Enterprises	3,091	3,900
Equity attributable to non-controlling interests	5,405	5,658
Total equity	8,496	9,558	$ 9,758	$ 9,343
Total Liabilities and Equity	26,269	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	2,384	2,455
Investments	6,520	6,719
Other assets	6,716	8,041
Total Assets	15,642	17,234
Accounts payable, accrued expenses and other liabilities	1,293	1,589
Securities sold, not yet purchased, at fair value	5,654	6,495
Total liabilities	6,947	8,084
Equity attributable to Icahn Enterprises	4,013	4,184
Equity attributable to non-controlling interests	4,682	4,966
Total equity	8,695	9,150
Total Liabilities and Equity	15,642	17,234
Energy Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	601	510
Cash held at consolidated affiliated partnerships and restricted cash	7	7
Investments	103	76
Accounts receivable, net	330	358
Inventories, net	609	624
Property, plant and equipment, net	2,647	2,664
Goodwill and intangible assets, net	195	200
Other assets	316	296
Total Assets	4,808	4,735
Accounts payable, accrued expenses and other liabilities	1,771	1,823
Debt	1,590	1,591
Total liabilities	3,361	3,414
Equity attributable to Icahn Enterprises	744	648
Equity attributable to non-controlling interests	703	673
Total equity	1,447	1,321
Total Liabilities and Equity	4,808	4,735
Automotive Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	34	32
Cash held at consolidated affiliated partnerships and restricted cash	9	10
Accounts receivable, net	53	99
Inventories, net	256	686
Property, plant and equipment, net	797	826
Goodwill and intangible assets, net	348	352
Other assets	472	527
Total Assets	1,969	2,532
Accounts payable, accrued expenses and other liabilities	838	981
Debt	18	21
Total liabilities	856	1,002
Equity attributable to Icahn Enterprises	1,113	1,530
Total equity	1,113	1,530
Total Liabilities and Equity	1,969	2,532
Food Packaging Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	13	9
Accounts receivable, net	86	87
Inventories, net	112	103
Property, plant and equipment, net	139	142
Goodwill and intangible assets, net	24	24
Other assets	104	110
Total Assets	478	475
Accounts payable, accrued expenses and other liabilities	139	149
Debt	164	162
Total liabilities	303	311
Equity attributable to Icahn Enterprises	159	149
Equity attributable to non-controlling interests	16	15
Total equity	175	164
Total Liabilities and Equity	478	475
Real Estate Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	41	26
Cash held at consolidated affiliated partnerships and restricted cash	7	8
Investments	14	14
Accounts receivable, net	12	12
Property, plant and equipment, net	343	345
Other assets	103	102
Total Assets	520	507
Accounts payable, accrued expenses and other liabilities	58	47
Debt	1	1
Total liabilities	59	48
Equity attributable to Icahn Enterprises	457	455
Equity attributable to non-controlling interests	4	4
Total equity	461	459
Total Liabilities and Equity	520	507
Home Fashion Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	6	5
Cash held at consolidated affiliated partnerships and restricted cash	3	3
Accounts receivable, net	24	24
Inventories, net	93	90
Property, plant and equipment, net	55	56
Goodwill and intangible assets, net	19	19
Other assets	16	16
Total Assets	216	213
Accounts payable, accrued expenses and other liabilities	46	45
Debt	9	12
Total liabilities	55	57
Equity attributable to Icahn Enterprises	161	156
Total equity	161	156
Total Liabilities and Equity	216	213
Pharma Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	23	16
Accounts receivable, net	22	26
Inventories, net	27	28
Goodwill and intangible assets, net	219	226
Other assets	6	6
Total Assets	297	302
Accounts payable, accrued expenses and other liabilities	60	61
Total liabilities	60	61
Equity attributable to Icahn Enterprises	237	241
Total equity	237	241
Total Liabilities and Equity	297	302
Holding Company
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	1,868	1,720
Cash held at consolidated affiliated partnerships and restricted cash	71	66
Related party notes receivable, net	207
Property, plant and equipment, net	5	5
Other assets	188	125
Total Assets	2,339	1,916
Accounts payable, accrued expenses and other liabilities	823	70
Debt	5,309	5,309
Total liabilities	6,132	5,379
Equity attributable to Icahn Enterprises	(3,793)	(3,463)
Total equity	(3,793)	(3,463)
Total Liabilities and Equity	$ 2,339	$ 1,916