Segment Reporting - Condensed Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	$ 2,684	$ 3,796	$ 5,442	$ 6,764
Other revenues from operations	198	197	385	365
Net (loss) gain from investment activities	(500)	(442)	(943)	497
Interest and dividend income	167	50	338	92
(Loss) gain on disposition of assets, net			3	2
Other (loss) income, net	(9)	(98)	(41)	(122)
Total revenues	2,540	3,503	5,181	7,596
Cost of goods sold	2,310	3,174	4,570	5,712
Other expenses from operations	160	148	318	285
Selling, general and administrative	215	315	444	616
Impairment on related party note receivable	116		116
Loss on deconsolidation of subsidiary	20		246
Interest expense	136	151	278	285
Total Expenses	2,957	3,788	5,972	6,898
(Loss) income before income tax (expense) benefit	(417)	(285)	(791)	698
Income tax (expense) benefit	(2)	(2)	14	(100)
Net (loss) income	(419)	(287)	(777)	598
Less: net (loss) income from continuing operations attributable to non-controlling interests	(150)	(159)	(238)	403
Net (loss) income from continuing operations attributable to Icahn Enterprises	(269)	(128)	(539)	195
Capital expenditures	73	99	131	154
Depreciation and amortization	129	127	251	249
Investment Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales			0	0
Other revenues from operations			0	0
Net (loss) gain from investment activities	(500)	(459)	(943)	449
Interest and dividend income	134	47	278	87
Other (loss) income, net	(18)	(18)	(46)	(35)
Total revenues	(384)	(430)	(711)	501
Cost of goods sold			0	0
Other expenses from operations			0	0
Selling, general and administrative	13	10	16	14
Impairment on related party note receivable			0
Loss on deconsolidation of subsidiary			0
Interest expense	38	53	83	85
Total Expenses	51	63	99	99
(Loss) income before income tax (expense) benefit	(435)	(493)	(810)	402
Income tax (expense) benefit			0	0
Net (loss) income	(435)	(493)	(810)	402
Less: net (loss) income from continuing operations attributable to non-controlling interests	(220)	(275)	(424)	206
Net (loss) income from continuing operations attributable to Icahn Enterprises	(215)	(218)	(386)	196
Capital expenditures			0	0
Depreciation and amortization			0	0
Energy Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	2,237	3,144	4,523	5,517
Other revenues from operations			0	0
Net (loss) gain from investment activities			0	0
Interest and dividend income	8	1	13	1
Other (loss) income, net	3	(75)	6	(85)
Total revenues	2,248	3,070	4,542	5,433
Cost of goods sold	1,990	2,715	3,916	4,838
Other expenses from operations			0	0
Selling, general and administrative	39	43	85	88
Impairment on related party note receivable			0
Loss on deconsolidation of subsidiary			0
Interest expense	22	24	45	48
Total Expenses	2,051	2,782	4,046	4,974
(Loss) income before income tax (expense) benefit	197	288	496	459
Income tax (expense) benefit	(41)	(61)	(93)	(91)
Net (loss) income	156	227	403	368
Less: net (loss) income from continuing operations attributable to non-controlling interests	70	117	185	197
Net (loss) income from continuing operations attributable to Icahn Enterprises	86	110	218	171
Capital expenditures	56	62	100	88
Depreciation and amortization	89	89	173	172
Automotive Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	248	438	535	845
Other revenues from operations	177	183	347	339
Net (loss) gain from investment activities			0	0
Interest and dividend income			0	0
Other (loss) income, net	3		3	2
Total revenues	428	621	885	1,186
Cost of goods sold	173	288	366	555
Other expenses from operations	142	134	287	260
Selling, general and administrative	114	219	246	427
Impairment on related party note receivable			0
Loss on deconsolidation of subsidiary			0
Interest expense	1		1	1
Total Expenses	430	641	900	1,243
(Loss) income before income tax (expense) benefit	(2)	(20)	(15)	(57)
Income tax (expense) benefit	6	5	6	14
Net (loss) income	4	(15)	(9)	(43)
Less: net (loss) income from continuing operations attributable to non-controlling interests			0	0
Net (loss) income from continuing operations attributable to Icahn Enterprises	4	(15)	(9)	(43)
Capital expenditures	11	30	21	51
Depreciation and amortization	22	20	41	40
Food Packaging Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	117	110	235	211
Other revenues from operations			0	0
Net (loss) gain from investment activities			0	0
Interest and dividend income			0	0
Other (loss) income, net	1	(6)	(6)	(5)
Total revenues	118	104	229	206
Cost of goods sold	90	90	181	171
Other expenses from operations			0	0
Selling, general and administrative	15	13	29	26
Impairment on related party note receivable			0
Loss on deconsolidation of subsidiary			0
Interest expense	3	2	6	3
Total Expenses	108	105	216	200
(Loss) income before income tax (expense) benefit	10	(1)	13	6
Income tax (expense) benefit	(5)	(2)	(1)	(3)
Net (loss) income	5	(3)	12	3
Less: net (loss) income from continuing operations attributable to non-controlling interests		(1)	1	0
Net (loss) income from continuing operations attributable to Icahn Enterprises	5	(2)	11	3
Capital expenditures	5	5	7	9
Depreciation and amortization	7	7	14	14
Real Estate Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	13	17	20	34
Other revenues from operations	20	13	36	24
Net (loss) gain from investment activities			0	0
Interest and dividend income			0	0
Other (loss) income, net	1		1	0
Total revenues	34	30	57	58
Cost of goods sold	8	12	14	22
Other expenses from operations	18	14	31	25
Selling, general and administrative	5	3	9	7
Impairment on related party note receivable			0
Loss on deconsolidation of subsidiary			0
Interest expense			0	0
Total Expenses	31	29	54	54
(Loss) income before income tax (expense) benefit	3	1	3	4
Income tax (expense) benefit			0	0
Net (loss) income	3	1	3	4
Less: net (loss) income from continuing operations attributable to non-controlling interests			0	0
Net (loss) income from continuing operations attributable to Icahn Enterprises	3	1	3	4
Capital expenditures		2	2	6
Depreciation and amortization	3	3	6	6
Home Fashion Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	46	69	86	124
Other revenues from operations			0	0
Net (loss) gain from investment activities			0	0
Interest and dividend income			0	0
Other (loss) income, net			0	0
Total revenues	46	69	86	124
Cost of goods sold	35	57	67	102
Other expenses from operations			0
Selling, general and administrative	10	11	20	22
Impairment on related party note receivable			0
Loss on deconsolidation of subsidiary			0
Interest expense		1	0	1
Total Expenses	45	69	87	125
(Loss) income before income tax (expense) benefit	1		(1)	(1)
Income tax (expense) benefit			0	0
Net (loss) income	1		(1)	(1)
Less: net (loss) income from continuing operations attributable to non-controlling interests			0	0
Net (loss) income from continuing operations attributable to Icahn Enterprises	1		(1)	(1)
Capital expenditures	1		1	0
Depreciation and amortization	1	1	3	3
Pharma Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	23	18	43	33
Other revenues from operations	1	1	2	2
Net (loss) gain from investment activities			0	0
Interest and dividend income			0	0
Other (loss) income, net	1		1	1
Total revenues	25	19	46	36
Cost of goods sold	14	12	26	24
Other expenses from operations			0	0
Selling, general and administrative	11	10	24	20
Impairment on related party note receivable			0
Loss on deconsolidation of subsidiary			0
Interest expense			0	0
Total Expenses	25	22	50	44
(Loss) income before income tax (expense) benefit		(3)	(4)	(8)
Income tax (expense) benefit			0	0
Net (loss) income		(3)	(4)	(8)
Less: net (loss) income from continuing operations attributable to non-controlling interests			0	0
Net (loss) income from continuing operations attributable to Icahn Enterprises		(3)	(4)	(8)
Capital expenditures			0	0
Depreciation and amortization	7	7	14	14
Holding Company
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales			0	0
Other revenues from operations			0	0
Net (loss) gain from investment activities		17	0	48
Interest and dividend income	25	2	47	4
Other (loss) income, net		1	0	0
Total revenues	25	20	47	52
Cost of goods sold			0	0
Other expenses from operations			0	0
Selling, general and administrative	8	6	15	12
Impairment on related party note receivable	116		116
Loss on deconsolidation of subsidiary	20		246
Interest expense	72	71	143	147
Total Expenses	216	77	520	159
(Loss) income before income tax (expense) benefit	(191)	(57)	(473)	(107)
Income tax (expense) benefit	38	56	102	(20)
Net (loss) income	(153)	(1)	(371)	(127)
Less: net (loss) income from continuing operations attributable to non-controlling interests			0	0
Net (loss) income from continuing operations attributable to Icahn Enterprises	$ (153)	$ (1)	(371)	(127)
Capital expenditures			0	0
Depreciation and amortization			$ 0	$ 0