Segment Reporting - Condensed Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	$ 2,321	$ 1,679
Cash held at consolidated affiliated partnerships and restricted cash	2,115	1,612
Investments	9,151	8,913
Accounts receivable, net	546	501
Inventories	1,478	1,580
Property, plant and equipment, net	4,085	4,228
Goodwill and intangible assets, net	885	954
Other assets	7,165	5,522
Total Assets	27,746	24,989
Accounts payable, accrued expenses and other liabilities	5,371	5,151
Securities sold, not yet purchased, at fair value	5,340	2,521
Debt	7,692	8,059
Total liabilities	18,403	15,731
Equity attributable to Icahn Enterprises	3,544	3,383
Equity attributable to non-controlling interests	5,799	5,875
Total equity	9,343	9,258	$ 10,942	$ 12,980
Total Liabilities and Equity	27,746	24,989
Investment Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	19	14
Cash held at consolidated affiliated partnerships and restricted cash	2,008	1,558
Investments	8,952	8,239
Other assets	6,156	4,308
Total Assets	17,135	14,119
Accounts payable, accrued expenses and other liabilities	2,405	2,256
Securities sold, not yet purchased, at fair value	5,340	2,521
Total liabilities	7,745	4,777
Equity attributable to Icahn Enterprises	4,271	4,283
Equity attributable to non-controlling interests	5,119	5,059
Total equity	9,390	9,342
Total Liabilities and Equity	17,135	14,119
Energy Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	510	667
Cash held at consolidated affiliated partnerships and restricted cash	7	7
Investments	79	253
Accounts receivable, net	299	178
Inventories	484	298
Property, plant and equipment, net	2,735	2,747
Goodwill and intangible assets, net	221	238
Other assets	252	335
Total Assets	4,587	4,723
Accounts payable, accrued expenses and other liabilities	1,579	1,189
Debt	1,660	1,691
Total liabilities	3,239	2,880
Equity attributable to Icahn Enterprises	686	1,039
Equity attributable to non-controlling interests	662	804
Total equity	1,348	1,843
Total Liabilities and Equity	4,587	4,723
Automotive Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	28	25
Cash held at consolidated affiliated partnerships and restricted cash	17	20
Investments		40
Accounts receivable, net	103	109
Inventories	780	1,080
Property, plant and equipment, net	786	857
Goodwill and intangible assets, net	362	372
Other assets	506	582
Total Assets	2,582	3,085
Accounts payable, accrued expenses and other liabilities	981	1,163
Debt	26	368
Total liabilities	1,007	1,531
Equity attributable to Icahn Enterprises	1,575	1,554
Total equity	1,575	1,554
Total Liabilities and Equity	2,582	3,085
Food Packaging Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	10	16
Accounts receivable, net	82	88
Inventories	93	89
Property, plant and equipment, net	147	160
Goodwill and intangible assets, net	27	31
Other assets	99	103
Total Assets	458	487
Accounts payable, accrued expenses and other liabilities	146	182
Debt	155	151
Total liabilities	301	333
Equity attributable to Icahn Enterprises	143	142
Equity attributable to non-controlling interests	14	12
Total equity	157	154
Total Liabilities and Equity	458	487
Metals Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents		1
Cash held at consolidated affiliated partnerships and restricted cash		2
Accounts receivable, net		63
Inventories		22
Property, plant and equipment, net		82
Goodwill and intangible assets, net		9
Other assets		38
Total Assets		217
Accounts payable, accrued expenses and other liabilities		73
Debt		16
Total liabilities		89
Equity attributable to Icahn Enterprises		128
Total equity		128
Total Liabilities and Equity		217
Real Estate Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	30	21
Cash held at consolidated affiliated partnerships and restricted cash	11	8
Investments	15	15
Accounts receivable, net	10	10
Property, plant and equipment, net	351	310
Goodwill and intangible assets, net		1
Other assets	109	121
Total Assets	526	486
Accounts payable, accrued expenses and other liabilities	49	45
Debt	1	1
Total liabilities	50	46
Equity attributable to Icahn Enterprises	472	440
Equity attributable to non-controlling interests	4
Total equity	476	440
Total Liabilities and Equity	526	486
Home Fashion Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	3	2
Cash held at consolidated affiliated partnerships and restricted cash		6
Accounts receivable, net	32	33
Inventories	106	81
Property, plant and equipment, net	60	65
Goodwill and intangible assets, net	21	21
Other assets	21	19
Total Assets	243	227
Accounts payable, accrued expenses and other liabilities	71	65
Debt	40	21
Total liabilities	111	86
Equity attributable to Icahn Enterprises	132	141
Total equity	132	141
Total Liabilities and Equity	243	227
Pharma Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	14	8
Accounts receivable, net	20	20
Inventories	15	10
Goodwill and intangible assets, net	254	282
Other assets	6	6
Total Assets	309	326
Accounts payable, accrued expenses and other liabilities	50	64
Total liabilities	50	64
Equity attributable to Icahn Enterprises	259	262
Total equity	259	262
Total Liabilities and Equity	309	326
Holding Company
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	1,707	925
Cash held at consolidated affiliated partnerships and restricted cash	72	11
Investments	105	366
Property, plant and equipment, net	6	7
Other assets	16	10
Total Assets	1,906	1,319
Accounts payable, accrued expenses and other liabilities	90	114
Debt	5,810	5,811
Total liabilities	5,900	5,925
Equity attributable to Icahn Enterprises	(3,994)	(4,606)
Total equity	(3,994)	(4,606)
Total Liabilities and Equity	$ 1,906	$ 1,319