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Condensed Statement of Operations By Reporting Segment (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Net sales		$ 2,864	$ 2,404	$ 8,220	$ 7,107
Other revenues from operations		217	181	632	705
Net gain from investment activities		(514)	420	328	604
Interest and dividend income		36	34	99	94
Gain on disposition of assets, net		65	446	65	1,969
Other income (loss), net		17	19	83	(11)
Total Revenues		2,685	3,504	9,427	10,468
Expenses:
Cost of goods sold		2,406	2,054	7,007	6,174
Other expenses from operations		173	144	490	469
Selling, general and administrative		340	323	1,042	945
Restructuring, net		17	1	20	3
Impairment		0	0	7	76
Interest expense		130	164	407	525
Total Expenses		3,066	2,686	8,973	8,192
Income (loss) from continuing operations before income tax benefit (expense)		(381)	818	454	2,276
Income tax benefit (expense)		71	(18)	57	(13)
Income (loss) from continuing operations		(310)	800	511	2,263
Less: net income (loss) attributable to non-controlling interests		(281)	223	268	236
Supplemental information:
Capital expenditures		127	102	276	333
Depreciation and amortization(1)	[1]	124	130	384	398
Amortization included in interest expense		3	2	5	8
Net (loss) income attributable to Icahn Enterprises from continuing operations		(29)	577	243	2,027
Investment Segment
Revenues:
Net sales		0	0	0	0
Other revenues from operations		0	0	0	0
Net gain from investment activities		(549)	386	233	552
Interest and dividend income		27	27	73	80
Gain on disposition of assets, net		0	0	0	0
Other income (loss), net		0	(9)	(1)	(50)
Total Revenues		(522)	404	305	582
Expenses:
Cost of goods sold		0	0	0	0
Other expenses from operations		0	0	0	0
Selling, general and administrative		4	3	6	8
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		6	42	33	134
Total Expenses		10	45	39	142
Income (loss) from continuing operations before income tax benefit (expense)		(532)	359	266	440
Income tax benefit (expense)		0	0	0	0
Income (loss) from continuing operations		(532)	359	266	440
Less: net income (loss) attributable to non-controlling interests		(326)	221	154	228
Supplemental information:
Capital expenditures		0	0	0	0
Depreciation and amortization(1)	[1]	0	0	0	0
Net (loss) income attributable to Icahn Enterprises from continuing operations		(206)	138	112	212
Automotive Segment
Revenues:
Net sales		600	604	1,760	1,702
Other revenues from operations		135	96	398	329
Net gain from investment activities		0	0	0	0
Interest and dividend income		0	0	0	0
Gain on disposition of assets, net		0	1	0	4
Other income (loss), net		(2)	(1)	(2)	0
Total Revenues		733	700	2,156	2,035
Expenses:
Cost of goods sold		373	396	1,119	1,125
Other expenses from operations		123	107	352	326
Selling, general and administrative		253	229	769	657
Restructuring, net		4	0	4	0
Impairment		0	(1)	3	6
Interest expense		4	2	12	10
Total Expenses		757	733	2,259	2,124
Income (loss) from continuing operations before income tax benefit (expense)		(24)	(33)	(103)	(89)
Income tax benefit (expense)		(11)	(17)	(38)	(53)
Income (loss) from continuing operations		(13)	(16)	(65)	(36)
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Supplemental information:
Capital expenditures		16	22	53	57
Depreciation and amortization(1)	[1]	23	26	72	81
Net (loss) income attributable to Icahn Enterprises from continuing operations		(13)	(16)	(65)	(36)
Energy Segment
Revenues:
Net sales		1,935	1,454	5,386	4,395
Other revenues from operations		0	0	0	0
Net gain from investment activities		0	0	0	0
Interest and dividend income		0	1	1	1
Gain on disposition of assets, net		0	(1)	(5)	(2)
Other income (loss), net		8	(16)	81	(3)
Total Revenues		1,943	1,438	5,463	4,391
Expenses:
Cost of goods sold		1,742	1,357	4,948	4,191
Other expenses from operations		0	0	0	0
Selling, general and administrative		31	35	102	105
Restructuring, net		4	0	4	0
Impairment		0	0	0	0
Interest expense		26	28	80	82
Total Expenses		1,803	1,420	5,134	4,378
Income (loss) from continuing operations before income tax benefit (expense)		140	18	329	13
Income tax benefit (expense)		31	2	60	(2)
Income (loss) from continuing operations		109	16	269	15
Less: net income (loss) attributable to non-controlling interests		43	(2)	106	(7)
Supplemental information:
Capital expenditures		26	23	68	80
Depreciation and amortization(1)	[1]	67	70	207	208
Net (loss) income attributable to Icahn Enterprises from continuing operations		66	18	163	22
Railcar Segment
Revenues:
Net sales		40	68	194	184
Other revenues from operations		60	66	169	320
Net gain from investment activities		0	0	0	2
Interest and dividend income		0	1	1	2
Gain on disposition of assets, net		0	(10)	5	1,511
Other income (loss), net		11	1	13	2
Total Revenues		111	126	382	2,021
Expenses:
Cost of goods sold		42	65	184	170
Other expenses from operations		36	25	97	107
Selling, general and administrative		11	9	31	38
Restructuring, net		0	0	0	0
Impairment		0	1	4	68
Interest expense		5	5	16	39
Total Expenses		94	105	332	422
Income (loss) from continuing operations before income tax benefit (expense)		17	21	50	1,599
Income tax benefit (expense)		4	6	14	525
Income (loss) from continuing operations		13	15	36	1,074
Less: net income (loss) attributable to non-controlling interests		5	3	13	11
Supplemental information:
Capital expenditures		57	30	81	139
Depreciation and amortization(1)	[1]	15	15	46	51
Net (loss) income attributable to Icahn Enterprises from continuing operations		8	12	23	1,063
Metals Segment
Revenues:
Net sales		120	110	370	315
Other revenues from operations		0	0	0	0
Net gain from investment activities		0	0	0	0
Interest and dividend income		0	0	0	0
Gain on disposition of assets, net		0	0	0	0
Other income (loss), net		1	(1)	1	(1)
Total Revenues		121	109	371	314
Expenses:
Cost of goods sold		115	105	349	299
Other expenses from operations		0	0	0	0
Selling, general and administrative		5	5	14	14
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		0	0	0	0
Total Expenses		120	110	363	313
Income (loss) from continuing operations before income tax benefit (expense)		1	(1)	8	1
Income tax benefit (expense)		0	(2)	0	(3)
Income (loss) from continuing operations		1	1	8	4
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Supplemental information:
Capital expenditures		8	2	10	4
Depreciation and amortization(1)	[1]	4	5	13	15
Net (loss) income attributable to Icahn Enterprises from continuing operations		1	1	8	4
Mining Segment
Revenues:
Net sales		26	21	72	76
Other revenues from operations		0	0	0	0
Net gain from investment activities		0	0	0	0
Interest and dividend income		1	0	1	1
Gain on disposition of assets, net		(2)	0	(2)	0
Other income (loss), net		2	(2)	7	(3)
Total Revenues		27	19	78	74
Expenses:
Cost of goods sold		18	15	54	45
Other expenses from operations		0	0	0	0
Selling, general and administrative		6	4	18	12
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		0	2	2	5
Total Expenses		24	21	74	62
Income (loss) from continuing operations before income tax benefit (expense)		3	(2)	4	12
Income tax benefit (expense)		0	0	2	2
Income (loss) from continuing operations		3	(2)	2	10
Less: net income (loss) attributable to non-controlling interests		0	0	(1)	2
Supplemental information:
Capital expenditures		9	10	32	27
Depreciation and amortization(1)	[1]	2	2	6	4
Net (loss) income attributable to Icahn Enterprises from continuing operations		3	(2)	3	8
Food Packaging Segment
Revenues:
Net sales		98	99	299	288
Other revenues from operations		0	0	0	0
Net gain from investment activities		0	0	0	0
Interest and dividend income		1	0	1	0
Gain on disposition of assets, net		0	0	0	0
Other income (loss), net		(2)	3	(15)	0
Total Revenues		97	102	285	288
Expenses:
Cost of goods sold		77	75	234	218
Other expenses from operations		0	0	0	0
Selling, general and administrative		14	13	44	44
Restructuring, net		10	1	10	3
Impairment		0	0	0	0
Interest expense		5	3	12	10
Total Expenses		106	92	300	275
Income (loss) from continuing operations before income tax benefit (expense)		(9)	10	(15)	13
Income tax benefit (expense)		2	4	0	5
Income (loss) from continuing operations		(11)	6	(15)	8
Less: net income (loss) attributable to non-controlling interests		(2)	1	(3)	2
Supplemental information:
Capital expenditures		8	6	19	15
Depreciation and amortization(1)	[1]	6	5	19	18
Net (loss) income attributable to Icahn Enterprises from continuing operations		(9)	5	(12)	6
Real Estate Segment
Revenues:
Net sales		7	2	14	9
Other revenues from operations		22	19	65	56
Net gain from investment activities		0	0	0	0
Interest and dividend income		5	2	15	2
Gain on disposition of assets, net		67	456	67	456
Other income (loss), net		0	39	0	39
Total Revenues		101	518	161	562
Expenses:
Cost of goods sold		6	2	11	7
Other expenses from operations		14	12	41	36
Selling, general and administrative		2	6	15	16
Restructuring, net		0	0	0	0
Impairment		0	0	0	2
Interest expense		0	0	1	1
Total Expenses		22	20	68	62
Income (loss) from continuing operations before income tax benefit (expense)		79	498	93	500
Income tax benefit (expense)		6	0	6	0
Income (loss) from continuing operations		73	498	87	500
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Supplemental information:
Capital expenditures		2	7	9	7
Depreciation and amortization(1)	[1]	5	5	15	15
Net (loss) income attributable to Icahn Enterprises from continuing operations		73	498	87	500
Home Fashion Segment
Revenues:
Net sales		38	46	125	138
Other revenues from operations		0	0	0	0
Net gain from investment activities		0	0	0	0
Interest and dividend income		0	0	0	0
Gain on disposition of assets, net		0	0	0	0
Other income (loss), net		0	0	1	0
Total Revenues		38	46	126	138
Expenses:
Cost of goods sold		33	39	108	119
Other expenses from operations		0	0	0	0
Selling, general and administrative		8	11	26	30
Restructuring, net		(1)	0	2	0
Impairment		0	0	0	0
Interest expense		0	0	0	0
Total Expenses		40	50	136	149
Income (loss) from continuing operations before income tax benefit (expense)		(2)	(4)	(10)	(11)
Income tax benefit (expense)		0	0	0	0
Income (loss) from continuing operations		(2)	(4)	(10)	(11)
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Supplemental information:
Capital expenditures		1	2	4	4
Depreciation and amortization(1)	[1]	2	2	6	6
Net (loss) income attributable to Icahn Enterprises from continuing operations		(2)	(4)	(10)	(11)
Holding Company
Revenues:
Net sales		0	0	0	0
Other revenues from operations		0	0	0	0
Net gain from investment activities		35	34	95	50
Interest and dividend income		2	3	7	8
Gain on disposition of assets, net		0	0	0	0
Other income (loss), net		(1)	5	(2)	5
Total Revenues		36	42	100	63
Expenses:
Cost of goods sold		0	0	0	0
Other expenses from operations		0	0	0	0
Selling, general and administrative		6	8	17	21
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		84	82	251	244
Total Expenses		90	90	268	265
Income (loss) from continuing operations before income tax benefit (expense)		(54)	(48)	(168)	(202)
Income tax benefit (expense)		(103)	25	(101)	(461)
Income (loss) from continuing operations		49	(73)	(67)	259
Less: net income (loss) attributable to non-controlling interests		(1)	0	(1)	0
Supplemental information:
Capital expenditures		0	0	0	0
Depreciation and amortization(1)	[1]	0	0	0	0
Net (loss) income attributable to Icahn Enterprises from continuing operations		$ 50	$ (73)	$ (66)	$ 259
[1] Excludes amounts related to the amortization of deferred financing costs and debt discounts and premiums included in interest expense in the amounts of $3 million and $2 million for the three months ended September 30, 2018 and 2017, respectively, and $5 million and $8 million for the nine months ended September 30, 2018 and 2017, respectively.

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