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Condensed Statement of Operations By Reporting Segment (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Net sales		$ 2,919	$ 2,332	$ 5,356	$ 4,704
Other revenues from operations		210	265	406	524
Net gain from investment activities		409	314	842	184
Interest and dividend income		37	32	63	60
(Loss) gain on disposition of assets, net		(4)	1,523	0	1,523
Other income (loss), net		7	(1)	66	(31)
Total Revenues		3,578	4,465	6,733	6,964
Expenses:
Cost of goods sold		2,510	2,068	4,601	4,120
Other expenses from operations		162	172	313	325
Selling, general and administrative		352	307	697	622
Restructuring, net		1	2	3	2
Impairment		7	69	7	76
Interest expense		125	177	277	361
Total Expenses		3,157	2,795	5,898	5,506
Income (loss) from continuing operations before income tax benefit (expense)		421	1,670	835	1,458
Income tax benefit (expense)		12	(3)	(14)	5
Income (loss) from continuing operations		433	1,667	821	1,463
Less: net income (loss) attributable to non-controlling interests		269	165	549	13
Supplemental information:
Capital expenditures		65	124	144	232
Depreciation and amortization(1)	[1]	129	136	260	268
Amortization included in interest expense		1	3	2	6
Net income attributable to Icahn Enterprises from continuing operations		164	1,502	272	1,450
Investment Segment
Revenues:
Net sales		0	0	0	0
Other revenues from operations		0	0	0	0
Net gain from investment activities		372	294	782	166
Interest and dividend income		28	27	46	53
(Loss) gain on disposition of assets, net		0	0	0	0
Other income (loss), net		(1)	0	(1)	(41)
Total Revenues		399	321	827	178
Expenses:
Cost of goods sold		0	0	0	0
Other expenses from operations		0	0	0	0
Selling, general and administrative		1	3	2	5
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		1	45	27	92
Total Expenses		2	48	29	97
Income (loss) from continuing operations before income tax benefit (expense)		397	273	798	81
Income tax benefit (expense)		0	0	0	0
Income (loss) from continuing operations		397	273	798	81
Less: net income (loss) attributable to non-controlling interests		240	176	480	7
Supplemental information:
Capital expenditures		0	0	0	0
Depreciation and amortization(1)	[1]	0	0	0	0
Net income attributable to Icahn Enterprises from continuing operations		157	97	318	74
Automotive Segment
Revenues:
Net sales		602	569	1,160	1,098
Other revenues from operations		135	125	263	233
Net gain from investment activities		0	0	0	0
Interest and dividend income		0	0	0	0
(Loss) gain on disposition of assets, net		0	3	0	3
Other income (loss), net		0	0	0	1
Total Revenues		737	697	1,423	1,335
Expenses:
Cost of goods sold		384	372	746	729
Other expenses from operations		117	120	229	219
Selling, general and administrative		258	212	516	428
Restructuring, net		0	0	0	0
Impairment		3	2	3	7
Interest expense		5	4	8	8
Total Expenses		767	710	1,502	1,391
Income (loss) from continuing operations before income tax benefit (expense)		(30)	(13)	(79)	(56)
Income tax benefit (expense)		(12)	(11)	(27)	(36)
Income (loss) from continuing operations		(18)	(2)	(52)	(20)
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Supplemental information:
Capital expenditures		18	25	37	35
Depreciation and amortization(1)	[1]	22	27	49	55
Net income attributable to Icahn Enterprises from continuing operations		(18)	(2)	(52)	(20)
Energy Segment
Revenues:
Net sales		1,914	1,434	3,451	2,942
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
(Loss) gain on disposition of assets, net		(5)	(1)	(5)	(1)
Other income (loss), net		12	0	73	12
Total Revenues		1,922	1,433	3,520	2,953
Expenses:
Cost of goods sold		1,776	1,416	3,206	2,834
Other expenses from operations		0	0	0	0
Selling, general and administrative		39	32	71	70
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		27	27	54	54
Total Expenses		1,842	1,475	3,331	2,958
Income (loss) from continuing operations before income tax benefit (expense)		80	(42)	189	(5)
Income tax benefit (expense)		12	(13)	29	(4)
Income (loss) from continuing operations		68	(29)	160	(1)
Less: net income (loss) attributable to non-controlling interests		26	(16)	63	(5)
Supplemental information:
Capital expenditures		22	34	42	58
Depreciation and amortization(1)	[1]	72	71	140	138
Net income attributable to Icahn Enterprises from continuing operations		42	(13)	97	4
Railcar Segment
Revenues:
Net sales		90	55	154	116
Other revenues from operations		57	121	109	254
Net gain from investment activities		(1)	2	0	2
Interest and dividend income		1	1	1	1
(Loss) gain on disposition of assets, net		1	1,521	5	1,521
Other income (loss), net		0	0	2	1
Total Revenues		148	1,700	271	1,895
Expenses:
Cost of goods sold		84	50	142	105
Other expenses from operations		32	39	61	82
Selling, general and administrative		11	15	20	29
Restructuring, net		0	0	0	0
Impairment		4	67	4	67
Interest expense		6	15	11	34
Total Expenses		137	186	238	317
Income (loss) from continuing operations before income tax benefit (expense)		11	1,514	33	1,578
Income tax benefit (expense)		4	507	10	519
Income (loss) from continuing operations		7	1,007	23	1,059
Less: net income (loss) attributable to non-controlling interests		3	4	8	8
Supplemental information:
Capital expenditures		5	50	24	109
Depreciation and amortization(1)	[1]	16	18	31	36
Net income attributable to Icahn Enterprises from continuing operations		4	1,003	15	1,051
Metals Segment
Revenues:
Net sales		132	102	250	205
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
(Loss) gain on disposition of assets, net		(1)	0	0	0
Other income (loss), net		0	0	0	0
Total Revenues		131	102	250	205
Expenses:
Cost of goods sold		124	98	234	194
Other expenses from operations		0	0	0	0
Selling, general and administrative		4	4	9	9
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		0	0	0	0
Total Expenses		128	102	243	203
Income (loss) from continuing operations before income tax benefit (expense)		3	0	7	2
Income tax benefit (expense)		0	(1)	0	(1)
Income (loss) from continuing operations		3	1	7	3
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Supplemental information:
Capital expenditures		1	0	2	2
Depreciation and amortization(1)	[1]	4	5	9	10
Net income attributable to Icahn Enterprises from continuing operations		3	1	7	3
Mining Segment
Revenues:
Net sales		26	22	46	55
Other revenues from operations		0	0	0	0
Net gain from investment activities		0	0	0	0
Interest and dividend income		0	1	0	1
(Loss) gain on disposition of assets, net		1	0	0	0
Other income (loss), net		4	1	5	(1)
Total Revenues		31	24	51	55
Expenses:
Cost of goods sold		19	13	36	30
Other expenses from operations		0	0	0	0
Selling, general and administrative		6	2	12	8
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		0	1	2	3
Total Expenses		25	16	50	41
Income (loss) from continuing operations before income tax benefit (expense)		6	8	1	14
Income tax benefit (expense)		1	2	2	2
Income (loss) from continuing operations		5	6	(1)	12
Less: net income (loss) attributable to non-controlling interests		1	1	(1)	2
Supplemental information:
Capital expenditures		10	8	23	17
Depreciation and amortization(1)	[1]	2	1	4	2
Net income attributable to Icahn Enterprises from continuing operations		4	5	0	10
Food Packaging Segment
Revenues:
Net sales		104	99	201	189
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
(Loss) gain on disposition of assets, net		0	0	0	0
Other income (loss), net		(7)	(2)	(13)	(3)
Total Revenues		97	97	188	186
Expenses:
Cost of goods sold		80	75	157	143
Other expenses from operations		0	0	0	0
Selling, general and administrative		15	16	30	31
Restructuring, net		0	2	0	2
Impairment		0	0	0	0
Interest expense		3	4	7	7
Total Expenses		98	97	194	183
Income (loss) from continuing operations before income tax benefit (expense)		(1)	0	(6)	3
Income tax benefit (expense)		0	0	(2)	1
Income (loss) from continuing operations		(1)	0	(4)	2
Less: net income (loss) attributable to non-controlling interests		(1)	0	(1)	1
Supplemental information:
Capital expenditures		6	6	11	9
Depreciation and amortization(1)	[1]	6	7	13	13
Net income attributable to Icahn Enterprises from continuing operations		0	0	(3)	1
Real Estate Segment
Revenues:
Net sales		6	6	7	7
Other revenues from operations		18	19	34	37
Net gain from investment activities		0	0	0	0
Interest and dividend income		5	0	10	0
(Loss) gain on disposition of assets, net		0	0	0	0
Other income (loss), net		0	0	0	0
Total Revenues		29	25	51	44
Expenses:
Cost of goods sold		4	4	5	5
Other expenses from operations		13	13	23	24
Selling, general and administrative		4	5	8	10
Restructuring, net		0	0	0	0
Impairment		0	0	0	2
Interest expense		0	1	1	1
Total Expenses		21	23	37	42
Income (loss) from continuing operations before income tax benefit (expense)		8	2	14	2
Income tax benefit (expense)		0	0	0	0
Income (loss) from continuing operations		8	2	14	2
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Supplemental information:
Capital expenditures		1	0	2	0
Depreciation and amortization(1)	[1]	5	5	10	10
Net income attributable to Icahn Enterprises from continuing operations		8	2	14	2
Home Fashion Segment
Revenues:
Net sales		45	45	87	92
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
(Loss) gain on disposition of assets, net		0	0	0	0
Other income (loss), net		1	0	1	0
Total Revenues		46	45	88	92
Expenses:
Cost of goods sold		39	40	75	80
Other expenses from operations		0	0	0	0
Selling, general and administrative		9	9	18	19
Restructuring, net		1	0	3	0
Impairment		0	0	0	0
Interest expense		0	0	0	0
Total Expenses		49	49	96	99
Income (loss) from continuing operations before income tax benefit (expense)		(3)	(4)	(8)	(7)
Income tax benefit (expense)		0	0	0	0
Income (loss) from continuing operations		(3)	(4)	(8)	(7)
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Supplemental information:
Capital expenditures		2	1	3	2
Depreciation and amortization(1)	[1]	2	2	4	4
Net income attributable to Icahn Enterprises from continuing operations		(3)	(4)	(8)	(7)
Holding Company
Revenues:
Net sales		0	0	0	0
Other revenues from operations		0	0	0	0
Net gain from investment activities		38	18	60	16
Interest and dividend income		2	3	5	5
(Loss) gain on disposition of assets, net		0	0	0	0
Other income (loss), net		(2)	0	(1)	0
Total Revenues		38	21	64	21
Expenses:
Cost of goods sold		0	0	0	0
Other expenses from operations		0	0	0	0
Selling, general and administrative		5	9	11	13
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		83	80	167	162
Total Expenses		88	89	178	175
Income (loss) from continuing operations before income tax benefit (expense)		(50)	(68)	(114)	(154)
Income tax benefit (expense)		(17)	(481)	2	(486)
Income (loss) from continuing operations		(33)	413	(116)	332
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Supplemental information:
Capital expenditures		0	0	0	0
Depreciation and amortization(1)	[1]	0	0	0	0
Net income attributable to Icahn Enterprises from continuing operations		$ (33)	$ 413	$ (116)	$ 332
[1] Excludes amounts related to the amortization of deferred financing costs and debt discounts and premiums included in interest expense in the amounts of $1 million and $3 million for the three months ended June 30, 2018 and 2017, respectively, and $2 million and $6 million for the six months ended June 30, 2018 and 2017, respectively.

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