Segment Reporting - Condensed Balance Sheets (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	$ 2,183	$ 2,603
Cash held at consolidated affiliated partnerships and restricted cash	2,692	2,636
Investments	2,073	2,310
Accounts receivable, net	503	479
Inventories, net	1,000	897
Property, plant and equipment, net	3,824	3,843
Goodwill and intangible assets, net	683	697
Other assets	2,523	2,814
Total Assets	15,481	16,279
Accounts payable, accrued expenses and other liabilities	4,049	3,476
Securities sold, not yet purchased, at fair value	896	1,373
Debt	6,794	6,809
Total liabilities	11,739	11,658
Equity attributable to Icahn Enterprises	1,774	2,466
Equity attributable to non-controlling interests	1,968	2,155
Total equity	3,742	4,621	$ 5,625	$ 6,073
Total Liabilities and Equity	15,481	16,279
Investment Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	12	9
Cash held at consolidated affiliated partnerships and restricted cash	2,508	2,449
Investments	2,039	2,272
Other assets	1,171	1,660
Total Assets	5,730	6,390
Accounts payable, accrued expenses and other liabilities	984	817
Securities sold, not yet purchased, at fair value	896	1,373
Total liabilities	1,880	2,190
Equity attributable to Icahn Enterprises	2,479	2,703
Equity attributable to non-controlling interests	1,371	1,497
Total equity	3,850	4,200
Total Liabilities and Equity	5,730	6,390
Energy
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	695	987
Investments	20	24
Accounts receivable, net	320	295
Inventories, net	585	502
Property, plant and equipment, net	2,484	2,504
Goodwill and intangible assets, net	154	159
Other assets	464	280
Total Assets	4,722	4,751
Accounts payable, accrued expenses and other liabilities	1,610	1,509
Debt	1,918	1,919
Total liabilities	3,528	3,428
Equity attributable to Icahn Enterprises	616	685
Equity attributable to non-controlling interests	578	638
Total equity	1,194	1,323
Total Liabilities and Equity	4,722	4,751
Automotive Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	70	133
Cash held at consolidated affiliated partnerships and restricted cash	3	8
Accounts receivable, net	27	30
Inventories, net	178	168
Property, plant and equipment, net	815	808
Goodwill and intangible assets, net	326	328
Other assets	462	464
Total Assets	1,881	1,939
Accounts payable, accrued expenses and other liabilities	783	809
Debt	28	31
Total liabilities	811	840
Equity attributable to Icahn Enterprises	1,070	1,099
Total equity	1,070	1,099
Total Liabilities and Equity	1,881	1,939
Food Packaging Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	6	6
Accounts receivable, net	77	75
Inventories, net	116	109
Property, plant and equipment, net	118	124
Goodwill and intangible assets, net	21	21
Other assets	96	90
Total Assets	434	425
Accounts payable, accrued expenses and other liabilities	120	107
Debt	136	144
Total liabilities	256	251
Equity attributable to Icahn Enterprises	164	159
Equity attributable to non-controlling interests	14	15
Total equity	178	174
Total Liabilities and Equity	434	425
Real Estate Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	38	25
Cash held at consolidated affiliated partnerships and restricted cash	2	2
Investments	14	14
Accounts receivable, net	14	14
Property, plant and equipment, net	350	350
Other assets	94	90
Total Assets	512	495
Accounts payable, accrued expenses and other liabilities	76	42
Debt	1	1
Total liabilities	77	43
Equity attributable to Icahn Enterprises	430	447
Equity attributable to non-controlling interests	5	5
Total equity	435	452
Total Liabilities and Equity	512	495
Home Fashion Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	3	4
Cash held at consolidated affiliated partnerships and restricted cash	5	4
Accounts receivable, net	26	28
Inventories, net	96	93
Property, plant and equipment, net	53	53
Goodwill and intangible assets, net	19	19
Other assets	18	19
Total Assets	220	220
Accounts payable, accrued expenses and other liabilities	42	43
Debt	12	15
Total liabilities	54	58
Equity attributable to Icahn Enterprises	166	162
Total equity	166	162
Total Liabilities and Equity	220	220
Pharma
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	41	42
Accounts receivable, net	39	37
Inventories, net	25	25
Goodwill and intangible assets, net	163	170
Other assets	6	7
Total Assets	274	281
Accounts payable, accrued expenses and other liabilities	59	72
Total liabilities	59	72
Equity attributable to Icahn Enterprises	215	209
Total equity	215	209
Total Liabilities and Equity	274	281
Holding Company
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	1,318	1,397
Cash held at consolidated affiliated partnerships and restricted cash	174	173
Property, plant and equipment, net	4	4
Other assets	212	204
Total Assets	1,708	1,778
Accounts payable, accrued expenses and other liabilities	375	77
Debt	4,699	4,699
Total liabilities	5,074	4,776
Equity attributable to Icahn Enterprises	(3,366)	(2,998)
Total equity	(3,366)	(2,998)
Total Liabilities and Equity	$ 1,708	$ 1,778