Segment Reporting - Condensed Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	$ 1,450	$ 2,603
Cash held at consolidated affiliated partnerships and restricted cash	1,969	2,636
Investments	2,251	2,310
Accounts receivable, net	393	479
Related party note receivable	129	7
Inventories, net	845	897
Property, plant and equipment, net	3,670	3,843
Goodwill and intangible assets, net	639	697
Other assets	2,869	2,807
Total Assets	14,215	16,279
Accounts payable, accrued expenses and other liabilities	2,791	3,476
Securities sold, not yet purchased, at fair value	1,382	1,373
Debt	6,616	6,809
Total liabilities	10,789	11,658
Equity attributable to Icahn Enterprises	1,942	2,466
Equity attributable to non-controlling interests	1,484	2,155
Total equity	3,426	4,621	$ 6,073	$ 9,558
Total Liabilities and Equity	14,215	16,279
Investment Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	16	9
Cash held at consolidated affiliated partnerships and restricted cash	1,788	2,449
Investments	2,146	2,272
Other assets	1,661	1,660
Total Assets	5,611	6,390
Accounts payable, accrued expenses and other liabilities	606	817
Securities sold, not yet purchased, at fair value	1,382	1,373
Total liabilities	1,988	2,190
Equity attributable to Icahn Enterprises	2,711	2,703
Equity attributable to non-controlling interests	912	1,497
Total equity	3,623	4,200
Total Liabilities and Equity	5,611	6,390
Energy
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	511	987
Investments	17	24
Accounts receivable, net	235	295
Inventories, net	472	502
Property, plant and equipment, net	2,333	2,504
Goodwill and intangible assets, net	139	159
Other assets	422	280
Total Assets	4,129	4,751
Accounts payable, accrued expenses and other liabilities	1,079	1,509
Debt	1,765	1,919
Total liabilities	2,844	3,428
Equity attributable to Icahn Enterprises	722	685
Equity attributable to non-controlling interests	563	638
Total equity	1,285	1,323
Total Liabilities and Equity	4,129	4,751
Automotive Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	14	133
Cash held at consolidated affiliated partnerships and restricted cash	8	8
Accounts receivable, net	25	30
Inventories, net	165	168
Property, plant and equipment, net	351	808
Goodwill and intangible assets, net	316	328
Other assets	369	464
Total Assets	1,248	1,939
Accounts payable, accrued expenses and other liabilities	772	809
Debt	21	31
Total liabilities	793	840
Equity attributable to Icahn Enterprises	455	1,099
Total equity	455	1,099
Total Liabilities and Equity	1,248	1,939
Food Packaging Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	9	6
Accounts receivable, net	60	75
Inventories, net	97	109
Property, plant and equipment, net	141	124
Goodwill and intangible assets, net	21	21
Other assets	79	90
Total Assets	407	425
Accounts payable, accrued expenses and other liabilities	117	107
Debt	142	144
Total liabilities	259	251
Equity attributable to Icahn Enterprises	139	159
Equity attributable to non-controlling interests	9	15
Total equity	148	174
Total Liabilities and Equity	407	425
Real Estate Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	31	25
Cash held at consolidated affiliated partnerships and restricted cash		2
Investments	88	14
Accounts receivable, net	10	14
Related party note receivable	129
Property, plant and equipment, net	787	350
Other assets	79	90
Total Assets	1,124	495
Accounts payable, accrued expenses and other liabilities	32	42
Debt	1	1
Total liabilities	33	43
Equity attributable to Icahn Enterprises	1,091	447
Equity attributable to non-controlling interests		5
Total equity	1,091	452
Total Liabilities and Equity	1,124	495
Home Fashion Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	4	4
Cash held at consolidated affiliated partnerships and restricted cash	3	4
Accounts receivable, net	27	28
Inventories, net	87	93
Property, plant and equipment, net	55	53
Goodwill and intangible assets, net	21	19
Other assets	15	19
Total Assets	212	220
Accounts payable, accrued expenses and other liabilities	34	43
Debt	23	15
Total liabilities	57	58
Equity attributable to Icahn Enterprises	155	162
Total equity	155	162
Total Liabilities and Equity	212	220
Pharma
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	26	42
Accounts receivable, net	36	37
Inventories, net	24	25
Goodwill and intangible assets, net	142	170
Other assets	8	7
Total Assets	236	281
Accounts payable, accrued expenses and other liabilities	67	72
Total liabilities	67	72
Equity attributable to Icahn Enterprises	169	209
Total equity	169	209
Total Liabilities and Equity	236	281
Holding Company
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	839	1,397
Cash held at consolidated affiliated partnerships and restricted cash	170	173
Related party note receivable		7
Property, plant and equipment, net	3	4
Other assets	236	197
Total Assets	1,248	1,778
Accounts payable, accrued expenses and other liabilities	84	77
Debt	4,664	4,699
Total liabilities	4,748	4,776
Equity attributable to Icahn Enterprises	(3,500)	(2,998)
Total equity	(3,500)	(2,998)
Total Liabilities and Equity	$ 1,248	$ 1,778