Segment Reporting - Condensed Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	$ 2,432			$ 2,321
Cash held at consolidated affiliated partnerships and restricted cash	4,778			2,115
Investments	4,877			9,151
Accounts receivable, net	610			546
Inventories, net	1,674			1,478
Property, plant and equipment, net	4,057			4,085
Goodwill and intangible assets, net	833			885
Other assets	8,259			7,165
Total Assets	27,520			27,746
Accounts payable, accrued expenses and other liabilities	5,144			5,371
Securities sold, not yet purchased, at fair value	5,382			5,340
Debt	7,127			7,692
Total liabilities	17,653			18,403
Equity attributable to Icahn Enterprises	4,003			3,544
Equity attributable to non-controlling interests	5,864			5,799
Total equity	9,867	$ 10,158	$ 9,758	9,343	$ 10,007	$ 10,025	$ 9,582	$ 9,258
Total Liabilities and Equity	27,520			27,746
Investment Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	21			19
Cash held at consolidated affiliated partnerships and restricted cash	4,684			2,008
Investments	4,786			8,952
Other assets	7,271			6,156
Total Assets	16,762			17,135
Accounts payable, accrued expenses and other liabilities	1,785			2,405
Securities sold, not yet purchased, at fair value	5,382			5,340
Total liabilities	7,167			7,745
Equity attributable to Icahn Enterprises	4,387			4,271
Equity attributable to non-controlling interests	5,208			5,119
Total equity	9,595			9,390
Total Liabilities and Equity	16,762			17,135
Energy Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	618			510
Cash held at consolidated affiliated partnerships and restricted cash	7			7
Investments	77			79
Accounts receivable, net	320			299
Inventories, net	632			484
Property, plant and equipment, net	2,696			2,735
Goodwill and intangible assets, net	205			221
Other assets	284			252
Total Assets	4,839			4,587
Accounts payable, accrued expenses and other liabilities	1,933			1,579
Debt	1,593			1,660
Total liabilities	3,526			3,239
Equity attributable to Icahn Enterprises	674			686
Equity attributable to non-controlling interests	639			662
Total equity	1,313			1,348
Total Liabilities and Equity	4,839			4,587
Automotive Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	61			28
Cash held at consolidated affiliated partnerships and restricted cash	10			17
Accounts receivable, net	143			103
Inventories, net	812			780
Property, plant and equipment, net	819			786
Goodwill and intangible assets, net	354			362
Other assets	461			506
Total Assets	2,660			2,582
Accounts payable, accrued expenses and other liabilities	1,012			981
Debt	15			26
Total liabilities	1,027			1,007
Equity attributable to Icahn Enterprises	1,633			1,575
Total equity	1,633			1,575
Total Liabilities and Equity	2,660			2,582
Food Packaging Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	12			10
Accounts receivable, net	84			82
Inventories, net	101			93
Property, plant and equipment, net	133			147
Goodwill and intangible assets, net	24			27
Other assets	94			99
Total Assets	448			458
Accounts payable, accrued expenses and other liabilities	138			146
Debt	163			155
Total liabilities	301			301
Equity attributable to Icahn Enterprises	134			143
Equity attributable to non-controlling interests	13			14
Total equity	147			157
Total Liabilities and Equity	448			458
Real Estate Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	26			30
Cash held at consolidated affiliated partnerships and restricted cash	10			11
Investments	14			15
Accounts receivable, net	13			10
Property, plant and equipment, net	347			351
Other assets	105			109
Total Assets	515			526
Accounts payable, accrued expenses and other liabilities	52			49
Debt	1			1
Total liabilities	53			50
Equity attributable to Icahn Enterprises	458			472
Equity attributable to non-controlling interests	4			4
Total equity	462			476
Total Liabilities and Equity	515			526
Home Fashion Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	3			3
Cash held at consolidated affiliated partnerships and restricted cash	1
Accounts receivable, net	30			32
Inventories, net	106			106
Property, plant and equipment, net	57			60
Goodwill and intangible assets, net	17			21
Other assets	17			21
Total Assets	231			243
Accounts payable, accrued expenses and other liabilities	60			71
Debt	45			40
Total liabilities	105			111
Equity attributable to Icahn Enterprises	126			132
Total equity	126			132
Total Liabilities and Equity	231			243
Pharma Segment
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	20			14
Accounts receivable, net	20			20
Inventories, net	23			15
Goodwill and intangible assets, net	233			254
Other assets	5			6
Total Assets	301			309
Accounts payable, accrued expenses and other liabilities	56			50
Total liabilities	56			50
Equity attributable to Icahn Enterprises	245			259
Total equity	245			259
Total Liabilities and Equity	301			309
Holding Company
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	1,671			1,707
Cash held at consolidated affiliated partnerships and restricted cash	66			72
Investments				105
Property, plant and equipment, net	5			6
Other assets	22			16
Total Assets	1,764			1,906
Accounts payable, accrued expenses and other liabilities	108			90
Debt	5,310			5,810
Total liabilities	5,418			5,900
Equity attributable to Icahn Enterprises	(3,654)			(3,994)
Total equity	(3,654)			(3,994)
Total Liabilities and Equity	$ 1,764			$ 1,906