Segment and Geographic Reporting - Condensed Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	$ 2,951	$ 2,337
Cash held at consolidated affiliated partnerships and restricted cash	2,995	2,549
Investments	3,012	6,809
Accounts receivable, net	485	606
Related party notes receivable, net	11
Inventories	1,047	1,531
Property, plant and equipment, net	3,969	4,038
Goodwill and intangible assets, net	754	821
Other assets	5,634	9,223
Total assets	20,858	27,914
Accounts payable, accrued expenses and other liabilities	4,105	4,765
Securities sold, not yet purchased, at fair value	3,473	6,495
Debt	7,207	7,096
Total liabilities	14,785	18,356
Equity attributable to Icahn Enterprises	3,208	3,900
Equity attributable to non-controlling interests	2,865	5,658
Total equity	6,073	9,558	$ 9,343	$ 9,258
Total Liabilities and Equity	20,858	27,914
Investment Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	23	19
Cash held at consolidated affiliated partnerships and restricted cash	2,799	2,455
Investments	2,898	6,719
Other assets	4,425	8,041
Total assets	10,145	17,234
Accounts payable, accrued expenses and other liabilities	1,312	1,589
Securities sold, not yet purchased, at fair value	3,473	6,495
Total liabilities	4,785	8,084
Equity attributable to Icahn Enterprises	3,243	4,184
Equity attributable to non-controlling interests	2,117	4,966
Total equity	5,360	9,150
Total Liabilities and Equity	10,145	17,234
Energy
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	1,179	510
Cash held at consolidated affiliated partnerships and restricted cash	7	7
Investments	100	76
Accounts receivable, net	286	358
Inventories	604	624
Property, plant and equipment, net	2,594	2,664
Goodwill and intangible assets, net	179	200
Other assets	310	296
Total assets	5,259	4,735
Accounts payable, accrued expenses and other liabilities	1,553	1,823
Debt	2,185	1,591
Total liabilities	3,738	3,414
Equity attributable to Icahn Enterprises	795	648
Equity attributable to non-controlling interests	726	673
Total equity	1,521	1,321
Total Liabilities and Equity	5,259	4,735
Automotive Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	104	32
Cash held at consolidated affiliated partnerships and restricted cash	9	10
Accounts receivable, net	41	99
Inventories	228	686
Property, plant and equipment, net	822	826
Goodwill and intangible assets, net	335	352
Other assets	480	527
Total assets	2,019	2,532
Accounts payable, accrued expenses and other liabilities	890	981
Debt	33	21
Total liabilities	923	1,002
Equity attributable to Icahn Enterprises	1,096	1,530
Total equity	1,096	1,530
Total Liabilities and Equity	2,019	2,532
Food Packaging Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	8	9
Accounts receivable, net	89	87
Inventories	111	103
Property, plant and equipment, net	134	142
Goodwill and intangible assets, net	23	24
Other assets	101	110
Total assets	466	475
Accounts payable, accrued expenses and other liabilities	148	149
Debt	133	162
Total liabilities	281	311
Equity attributable to Icahn Enterprises	168	149
Equity attributable to non-controlling interests	17	15
Total equity	185	164
Total Liabilities and Equity	466	475
Real Estate Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	22	26
Cash held at consolidated affiliated partnerships and restricted cash	4	8
Investments	14	14
Accounts receivable, net	16	12
Property, plant and equipment, net	363	345
Other assets	69	102
Total assets	488	507
Accounts payable, accrued expenses and other liabilities	43	47
Debt	1	1
Total liabilities	44	48
Equity attributable to Icahn Enterprises	439	455
Equity attributable to non-controlling interests	5	4
Total equity	444	459
Total Liabilities and Equity	488	507
Home Fashion Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	5	5
Cash held at consolidated affiliated partnerships and restricted cash	3	3
Accounts receivable, net	26	24
Inventories	81	90
Property, plant and equipment, net	52	56
Goodwill and intangible assets, net	19	19
Other assets	17	16
Total assets	203	213
Accounts payable, accrued expenses and other liabilities	42	45
Debt	8	12
Total liabilities	50	57
Equity attributable to Icahn Enterprises	153	156
Total equity	153	156
Total Liabilities and Equity	203	213
Pharma
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	26	16
Accounts receivable, net	27	26
Inventories	23	28
Goodwill and intangible assets, net	198	226
Other assets	8	6
Total assets	282	302
Accounts payable, accrued expenses and other liabilities	55	61
Total liabilities	55	61
Equity attributable to Icahn Enterprises	227	241
Total equity	227	241
Total Liabilities and Equity	282	302
Holding Company
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	1,584	1,720
Cash held at consolidated affiliated partnerships and restricted cash	173	66
Related party notes receivable, net	11
Property, plant and equipment, net	4	5
Other assets	224	125
Total assets	1,996	1,916
Accounts payable, accrued expenses and other liabilities	62	70
Debt	4,847	5,309
Total liabilities	4,909	5,379
Equity attributable to Icahn Enterprises	(2,913)	(3,463)
Total equity	(2,913)	(3,463)
Total Liabilities and Equity	$ 1,996	$ 1,916