Segment Reporting - Condensed Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	$ 2,362	$ 2,684	$ 4,606	$ 5,442
Other revenues from operations	191	198	374	385
Net loss from investment activities	(479)	(500)	(575)	(943)
Interest and dividend income	122	167	265	338
Gain (loss) on disposition of assets, net	1	3	(5)	3
Other income, net	4	7	6	3
Total revenues	2,201	2,559	4,671	5,228
Cost of goods sold	2,204	2,310	4,191	4,570
Other expenses from operations	154	160	307	318
Dividend expense	13	19	33	47
Selling, general and administrative	183	215	376	444
Restructuring, net	1		1
Credit loss on related party note receivable		116		116
Loss on deconsolidation of subsidiary		20		246
Interest expense	128	136	264	278
Other loss (income), net	4	7	6	3
Total Expenses	2,683	2,976	5,172	6,019
Pre-tax loss	(482)	(417)	(501)	(791)
Income tax (expense) benefit	(4)	(2)	(11)	14
Net (loss) income	(486)	(419)	(512)	(777)
Less: net (loss) income from continuing operations attributable to non-controlling interests	(155)	(150)	(143)	(238)
Net (loss) income from continuing operations attributable to Icahn Enterprises	(331)	(269)	(369)	(539)
Capital expenditures	66	73	134	131
Depreciation and amortization	127	129	256	251
Investment Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net loss from investment activities	(479)	(500)	(575)	(943)
Interest and dividend income	87	134	192	278
Other income, net		1		1
Total revenues	(392)	(365)	(383)	(664)
Dividend expense	13	19	33	47
Selling, general and administrative	6	13	10	16
Interest expense	19	38	44	83
Total Expenses	38	70	87	146
Pre-tax loss	(430)	(435)	(470)	(810)
Net (loss) income	(430)	(435)	(470)	(810)
Less: net (loss) income from continuing operations attributable to non-controlling interests	(173)	(220)	(190)	(424)
Net (loss) income from continuing operations attributable to Icahn Enterprises	(257)	(215)	(280)	(386)
Energy
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	1,966	2,237	3,829	4,523
Interest and dividend income	7	8	20	13
Gain (loss) on disposition of assets, net			(1)
Other income, net		3	8	6
Total revenues	1,977	2,248	3,856	4,542
Cost of goods sold	1,922	1,990	3,635	3,916
Selling, general and administrative	35	39	77	85
Interest expense	26	22	59	45
Total Expenses	1,983	2,051	3,771	4,046
Pre-tax loss	(6)	197	85	496
Income tax (expense) benefit	31	(41)	18	(93)
Net (loss) income	25	156	103	403
Less: net (loss) income from continuing operations attributable to non-controlling interests	17	70	46	185
Net (loss) income from continuing operations attributable to Icahn Enterprises	8	86	57	218
Capital expenditures	43	56	90	100
Depreciation and amortization	90	89	182	173
Automotive Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	212	248	431	535
Other revenues from operations	171	177	336	347
Interest and dividend income	1		2
Gain (loss) on disposition of assets, net	1	3	(4)	3
Total revenues	385	428	765	885
Cost of goods sold	142	173	294	366
Other expenses from operations	136	142	275	287
Selling, general and administrative	99	114	201	246
Interest expense	1	1	1	1
Total Expenses	378	430	771	900
Pre-tax loss	7	(2)	(6)	(15)
Income tax (expense) benefit		6	4	6
Net (loss) income	7	4	(2)	(9)
Net (loss) income from continuing operations attributable to Icahn Enterprises	7	4	(2)	(9)
Capital expenditures	12	11	28	21
Depreciation and amortization	18	22	37	41
Food Packaging Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	105	117	206	235
Other income, net		1	(2)	(6)
Total revenues	105	118	204	229
Cost of goods sold	86	90	166	181
Selling, general and administrative	11	15	24	29
Restructuring, net	1		1
Interest expense	3	3	6	6
Total Expenses	101	108	197	216
Pre-tax loss	4	10	7	13
Income tax (expense) benefit	(2)	(5)	(3)	(1)
Net (loss) income	2	5	4	12
Less: net (loss) income from continuing operations attributable to non-controlling interests	1		1	1
Net (loss) income from continuing operations attributable to Icahn Enterprises	1	5	3	11
Capital expenditures	3	5	5	7
Depreciation and amortization	7	7	13	14
Real Estate Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	10	13	11	20
Other revenues from operations	19	20	36	36
Other income, net		1		1
Total revenues	29	34	47	57
Cost of goods sold	7	8	8	14
Other expenses from operations	18	18	32	31
Selling, general and administrative	4	5	9	9
Total Expenses	29	31	49	54
Pre-tax loss		3	(2)	3
Net (loss) income		3	(2)	3
Net (loss) income from continuing operations attributable to Icahn Enterprises		3	(2)	3
Capital expenditures	7		9	2
Depreciation and amortization	4	3	7	6
Home Fashion Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	44	46	80	86
Total revenues	44	46	80	86
Cost of goods sold	33	35	60	67
Selling, general and administrative	11	10	21	20
Total Expenses	44	45	81	87
Pre-tax loss		1	(1)	(1)
Net (loss) income		1	(1)	(1)
Net (loss) income from continuing operations attributable to Icahn Enterprises		1	(1)	(1)
Capital expenditures	1	1	2	1
Depreciation and amortization	1	1	3	3
Pharma
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	25	23	49	43
Other revenues from operations	1	1	2	2
Interest and dividend income	1		1
Other income, net		1		1
Total revenues	27	25	52	46
Cost of goods sold	14	14	28	26
Selling, general and administrative	10	11	20	24
Total Expenses	24	25	48	50
Pre-tax loss	3		4	(4)
Net (loss) income	3		4	(4)
Net (loss) income from continuing operations attributable to Icahn Enterprises	3		4	(4)
Depreciation and amortization	7	7	14	14
Holding Company
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest and dividend income	26	25	50	47
Total revenues	26	25	50	47
Selling, general and administrative	7	8	14	15
Credit loss on related party note receivable		116		116
Loss on deconsolidation of subsidiary		20		246
Interest expense	79	72	154	143
Total Expenses	86	216	168	520
Pre-tax loss	(60)	(191)	(118)	(473)
Income tax (expense) benefit	(33)	38	(30)	102
Net (loss) income	(93)	(153)	(148)	(371)
Net (loss) income from continuing operations attributable to Icahn Enterprises	$ (93)	$ (153)	$ (148)	$ (371)