Segment Reporting - Condensed Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	$ 2,244	$ 2,758
Other revenues from operations	183	187
Net loss from investment activities	(96)	(443)
Interest and dividend income	143	171
Loss on disposition of assets, net	(6)
Other loss (income), net	18	32
Total revenues	2,468	2,673
Cost of goods sold	1,987	2,260
Other expenses from operations	153	158
Selling, general and administrative	193	229
Loss on deconsolidation of subsidiary		226
Interest expense	136	142
Total Expenses	2,487	3,047
(Loss) income before income tax (expense) benefit	(19)	(374)
Income tax (expense) benefit	(7)	16
Net (loss) income	(26)	(358)
Less: net (loss) income from continuing operations attributable to non-controlling interests	12	(88)
Net (loss) income from continuing operations attributable to Icahn Enterprises	(38)	(270)
Capital expenditures	68	58
Depreciation and amortization	129	122
Investment Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net loss from investment activities	(96)	(443)
Interest and dividend income	105	144
Other loss (income), net	20	28
Total revenues	9	(299)
Selling, general and administrative	4	3
Interest expense	25	45
Total Expenses	49	76
(Loss) income before income tax (expense) benefit	(40)	(375)
Net (loss) income	(40)	(375)
Less: net (loss) income from continuing operations attributable to non-controlling interests	(17)	(204)
Net (loss) income from continuing operations attributable to Icahn Enterprises	(23)	(171)
Energy
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	1,863	2,286
Interest and dividend income	13	5
Loss on disposition of assets, net	(1)
Other loss (income), net	(4)	(3)
Total revenues	1,875	2,291
Cost of goods sold	1,713	1,926
Selling, general and administrative	42	46
Interest expense	33	23
Total Expenses	1,784	1,992
(Loss) income before income tax (expense) benefit	91	299
Income tax (expense) benefit	(13)	(52)
Net (loss) income	78	247
Less: net (loss) income from continuing operations attributable to non-controlling interests	29	115
Net (loss) income from continuing operations attributable to Icahn Enterprises	49	132
Capital expenditures	47	44
Depreciation and amortization	92	84
Automotive Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	219	287
Other revenues from operations	165	170
Interest and dividend income	1
Loss on disposition of assets, net	(5)
Total revenues	380	457
Cost of goods sold	152	193
Other expenses from operations	139	145
Selling, general and administrative	102	132
Total Expenses	393	470
(Loss) income before income tax (expense) benefit	(13)	(13)
Income tax (expense) benefit	4
Net (loss) income	(9)	(13)
Net (loss) income from continuing operations attributable to Icahn Enterprises	(9)	(13)
Capital expenditures	16	10
Depreciation and amortization	19	19
Food Packaging Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	101	118
Other loss (income), net	2	7
Total revenues	101	118
Cost of goods sold	80	91
Selling, general and administrative	13	14
Interest expense	3	3
Total Expenses	98	115
(Loss) income before income tax (expense) benefit	3	3
Income tax (expense) benefit	(1)	4
Net (loss) income	2	7
Less: net (loss) income from continuing operations attributable to non-controlling interests		1
Net (loss) income from continuing operations attributable to Icahn Enterprises	2	6
Capital expenditures	2	2
Depreciation and amortization	6	7
Real Estate Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	1	7
Other revenues from operations	17	16
Total revenues	18	23
Cost of goods sold	1	6
Other expenses from operations	14	13
Selling, general and administrative	5	4
Total Expenses	20	23
(Loss) income before income tax (expense) benefit	(2)
Net (loss) income	(2)
Net (loss) income from continuing operations attributable to Icahn Enterprises	(2)
Capital expenditures	2	2
Depreciation and amortization	3	3
Home Fashion Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	36	40
Total revenues	36	40
Cost of goods sold	27	32
Selling, general and administrative	10	10
Total Expenses	37	42
(Loss) income before income tax (expense) benefit	(1)	(2)
Net (loss) income	(1)	(2)
Net (loss) income from continuing operations attributable to Icahn Enterprises	(1)	(2)
Capital expenditures	1
Depreciation and amortization	2	2
Pharma
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	24	20
Other revenues from operations	1	1
Total revenues	25	21
Cost of goods sold	14	12
Selling, general and administrative	10	13
Total Expenses	24	25
(Loss) income before income tax (expense) benefit	1	(4)
Net (loss) income	1	(4)
Net (loss) income from continuing operations attributable to Icahn Enterprises	1	(4)
Depreciation and amortization	7	7
Holding Company
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest and dividend income	24	22
Total revenues	24	22
Selling, general and administrative	7	7
Loss on deconsolidation of subsidiary		226
Interest expense	75	71
Total Expenses	82	304
(Loss) income before income tax (expense) benefit	(58)	(282)
Income tax (expense) benefit	3	64
Net (loss) income	(55)	(218)
Net (loss) income from continuing operations attributable to Icahn Enterprises	$ (55)	$ (218)