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Condensed Statement of Operations By Reporting Segment (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Net sales		$ 4,292	$ 3,904	$ 12,893	$ 11,546
Other revenues from operations		427	537	1,389	1,506
Net gain from investment activities		420	418	604	(826)
Interest and dividend income		37	27	99	97
Gain (loss) on disposition of assets, net		446	(1)	1,966	10
Other income, net		58	14	60	43
Total Revenues		5,680	4,899	17,011	12,376
Expenses:
Cost of goods sold		3,679	3,378	11,094	9,949
Other expenses from operations		254	342	786	902
Selling, general and administrative		633	603	1,883	1,736
Restructuring, net		5	8	14	29
Impairment		5	93	82	670
Interest expense		207	222	648	665
Total Expenses		4,783	4,646	14,507	13,951
Income (loss) before income tax benefit (expense)		897	253	2,504	(1,575)
Income tax expense		(68)	(15)	(110)	(81)
Net income (loss)		829	238	2,394	(1,656)
Less: net income (loss) attributable to non-controlling interests		232	254	262	(734)
Net income (loss) attributable to Icahn Enterprises		597	(16)	2,132	(922)
Supplemental Income Statement Elements [Abstract]
Capital expenditures		222	194	692	615
Depreciation and amortization(1)	[1]	251	258	746	739
Amortization included in interest expense		4	6	13	14
Investment Segment
Revenues:
Net sales		0	0	0	0
Other revenues from operations		0	0	0	0
Net gain from investment activities		386	412	552	(841)
Interest and dividend income		27	24	80	84
Gain (loss) on disposition of assets, net		0	0	0	0
Other income, net		(9)	(1)	(50)	(3)
Total Revenues		404	435	582	(760)
Expenses:
Cost of goods sold		0	0	0	0
Other expenses from operations		0	0	0	0
Selling, general and administrative		3	21	8	28
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		42	52	134	184
Total Expenses		45	73	142	212
Income (loss) before income tax benefit (expense)		359	362	440	(972)
Income tax expense		0	0	0	0
Net income (loss)		359	362	440	(972)
Less: net income (loss) attributable to non-controlling interests		221	251	228	(526)
Net income (loss) attributable to Icahn Enterprises		138	111	212	(446)
Supplemental Income Statement Elements [Abstract]
Capital expenditures		0	0	0	0
Depreciation and amortization(1)	[1]	0	0	0	0
Automotive Segment
Revenues:
Net sales		2,493	2,346	7,488	7,140
Other revenues from operations		96	116	329	314
Net gain from investment activities		0	0	0	0
Interest and dividend income		3	0	4	2
Gain (loss) on disposition of assets, net		1	(1)	4	8
Other income, net		15	15	45	52
Total Revenues		2,608	2,476	7,870	7,516
Expenses:
Cost of goods sold		2,022	1,899	6,045	5,797
Other expenses from operations		107	122	326	323
Selling, general and administrative		455	382	1,320	1,131
Restructuring, net		4	7	11	28
Impairment		4	1	12	4
Interest expense		42	41	124	118
Total Expenses		2,634	2,452	7,838	7,401
Income (loss) before income tax benefit (expense)		(26)	24	32	115
Income tax expense		(19)	(9)	(537)	12
Net income (loss)		(7)	33	569	103
Less: net income (loss) attributable to non-controlling interests		2	4	8	18
Net income (loss) attributable to Icahn Enterprises		(9)	29	561	85
Supplemental Income Statement Elements [Abstract]
Capital expenditures		113	98	333	306
Depreciation and amortization(1)	[1]	128	120	375	337
Energy Segment
Revenues:
Net sales		1,453	1,240	4,395	3,429
Other revenues from operations		0	0	0	0
Net gain from investment activities		0	5	0	5
Interest and dividend income		1	1	1	1
Gain (loss) on disposition of assets, net		(1)	(1)	(2)	(1)
Other income, net		(16)	(1)	(3)	(9)
Total Revenues		1,437	1,244	4,391	3,425
Expenses:
Cost of goods sold		1,356	1,195	4,191	3,297
Other expenses from operations		0	0	0	0
Selling, general and administrative		35	35	105	103
Restructuring, net		0	0	0	0
Impairment		0	0	0	574
Interest expense		28	26	82	56
Total Expenses		1,419	1,256	4,378	4,030
Income (loss) before income tax benefit (expense)		18	(12)	13	(605)
Income tax expense		2	(4)	(2)	(17)
Net income (loss)		16	(8)	15	(588)
Less: net income (loss) attributable to non-controlling interests		(2)	(10)	(7)	(259)
Net income (loss) attributable to Icahn Enterprises		18	2	22	(329)
Supplemental Income Statement Elements [Abstract]
Capital expenditures		23	23	80	106
Depreciation and amortization(1)	[1]	70	68	208	191
Railcar Segment
Revenues:
Net sales		68	94	184	315
Other revenues from operations		66	133	320	398
Net gain from investment activities		0	0	2	0
Interest and dividend income		1	0	2	2
Gain (loss) on disposition of assets, net		(10)	1	1,511	1
Other income, net		1	0	2	3
Total Revenues		126	228	2,021	719
Expenses:
Cost of goods sold		65	86	170	270
Other expenses from operations		25	80	107	186
Selling, general and administrative		9	10	38	32
Restructuring, net		0	0	0	0
Impairment		1	0	68	0
Interest expense		5	22	39	66
Total Expenses		105	198	422	554
Income (loss) before income tax benefit (expense)		21	30	1,599	165
Income tax expense		6	9	525	42
Net income (loss)		15	21	1,074	123
Less: net income (loss) attributable to non-controlling interests		3	3	11	25
Net income (loss) attributable to Icahn Enterprises		12	18	1,063	98
Supplemental Income Statement Elements [Abstract]
Capital expenditures		30	42	139	104
Depreciation and amortization(1)	[1]	15	35	51	103
Gaming Segment
Revenues:
Net sales		0	0	0	0
Other revenues from operations		246	268	685	740
Net gain from investment activities		0	0	0	0
Interest and dividend income		0	0	1	0
Gain (loss) on disposition of assets, net		0	0	(3)	0
Other income, net		60	3	61	3
Total Revenues		306	271	744	743
Expenses:
Cost of goods sold		0	0	0	0
Other expenses from operations		109	127	317	358
Selling, general and administrative		87	118	280	329
Restructuring, net		0	0	0	0
Impairment		0	92	0	92
Interest expense		3	3	9	9
Total Expenses		199	340	606	788
Income (loss) before income tax benefit (expense)		107	(69)	138	(45)
Income tax expense		27	14	48	24
Net income (loss)		80	(83)	90	(69)
Less: net income (loss) attributable to non-controlling interests		7	6	18	11
Net income (loss) attributable to Icahn Enterprises		73	(89)	72	(80)
Supplemental Income Statement Elements [Abstract]
Capital expenditures		30	15	83	63
Depreciation and amortization(1)	[1]	19	18	54	53
Metals Segment
Revenues:
Net sales		110	72	315	206
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 (loss) on disposition of assets, net		0	0	0	1
Other income, net		(1)	0	(1)	0
Total Revenues		109	72	314	207
Expenses:
Cost of goods sold		105	78	299	217
Other expenses from operations		0	0	0	0
Selling, general and administrative		5	4	14	14
Restructuring, net		0	1	0	1
Impairment		0	0	0	0
Interest expense		0	0	0	0
Total Expenses		110	83	313	232
Income (loss) before income tax benefit (expense)		(1)	(11)	1	(25)
Income tax expense		(2)	(5)	(3)	(12)
Net income (loss)		1	(6)	4	(13)
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Net income (loss) attributable to Icahn Enterprises		1	(6)	4	(13)
Supplemental Income Statement Elements [Abstract]
Capital expenditures		1	1	4	3
Depreciation and amortization(1)	[1]	5	6	15	17
Mining segment
Revenues:
Net sales		21	18	76	49
Other revenues from operations		0	0	0	0
Net gain from investment activities		0	0	0	0
Interest and dividend income		0	0	1	1
Gain (loss) on disposition of assets, net		0	0	0	0
Other income, net		(2)	(1)	(3)	(9)
Total Revenues		19	17	74	41
Expenses:
Cost of goods sold		15	13	45	43
Other expenses from operations		0	0	0	0
Selling, general and administrative		4	4	12	12
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		2	2	5	5
Total Expenses		21	19	62	60
Income (loss) before income tax benefit (expense)		(2)	(2)	12	(19)
Income tax expense		0	1	2	2
Net income (loss)		(2)	(3)	10	(21)
Less: net income (loss) attributable to non-controlling interests		0	(1)	2	(5)
Net income (loss) attributable to Icahn Enterprises		(2)	(2)	8	(16)
Supplemental Income Statement Elements [Abstract]
Capital expenditures		10	7	27	12
Depreciation and amortization(1)	[1]	2	2	4	3
Food Packaging Segment
Revenues:
Net sales		99	81	288	243
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 (loss) on disposition of assets, net		0	0	0	0
Other income, net		4	(1)	3	4
Total Revenues		103	80	291	247
Expenses:
Cost of goods sold		75	61	218	185
Other expenses from operations		0	0	0	0
Selling, general and administrative		14	12	47	39
Restructuring, net		1	0	3	0
Impairment		0	0	0	0
Interest expense		3	4	10	10
Total Expenses		93	77	278	234
Income (loss) before income tax benefit (expense)		10	3	13	13
Income tax expense		4	1	5	5
Net income (loss)		6	2	8	8
Less: net income (loss) attributable to non-controlling interests		1	1	2	2
Net income (loss) attributable to Icahn Enterprises		5	1	6	6
Supplemental Income Statement Elements [Abstract]
Capital expenditures		6	5	15	11
Depreciation and amortization(1)	[1]	5	4	18	15
Real Estate Segment
Revenues:
Net sales		2	5	9	13
Other revenues from operations		19	20	55	54
Net gain from investment activities		0	0	0	0
Interest and dividend income		2	0	2	0
Gain (loss) on disposition of assets, net		456	0	456	1
Other income, net		1	0	1	0
Total Revenues		480	25	523	68
Expenses:
Cost of goods sold		2	4	7	10
Other expenses from operations		13	13	36	35
Selling, general and administrative		2	4	8	9
Restructuring, net		0	0	0	0
Impairment		0	0	2	0
Interest expense		0	0	1	1
Total Expenses		17	21	54	55
Income (loss) before income tax benefit (expense)		463	4	469	13
Income tax expense		0	0	0	0
Net income (loss)		463	4	469	13
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Net income (loss) attributable to Icahn Enterprises		463	4	469	13
Supplemental Income Statement Elements [Abstract]
Capital expenditures		7	0	7	0
Depreciation and amortization(1)	[1]	5	4	15	15
Home Fashion Segment
Revenues:
Net sales		46	48	138	151
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 (loss) on disposition of assets, net		0	0	0	0
Other income, net		0	0	0	1
Total Revenues		46	48	138	152
Expenses:
Cost of goods sold		39	42	119	130
Other expenses from operations		0	0	0	0
Selling, general and administrative		11	10	30	28
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		0	0	0	0
Total Expenses		50	52	149	158
Income (loss) before income tax benefit (expense)		(4)	(4)	(11)	(6)
Income tax expense		0	0	0	0
Net income (loss)		(4)	(4)	(11)	(6)
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Net income (loss) attributable to Icahn Enterprises		(4)	(4)	(11)	(6)
Supplemental Income Statement Elements [Abstract]
Capital expenditures		2	3	4	10
Depreciation and amortization(1)	[1]	2	1	6	5
Holding Company
Revenues:
Net sales		0	0	0	0
Other revenues from operations		0	0	0	0
Net gain from investment activities		34	1	50	10
Interest and dividend income		3	2	8	7
Gain (loss) on disposition of assets, net		0	0	0	0
Other income, net		5	0	5	1
Total Revenues		42	3	63	18
Expenses:
Cost of goods sold		0	0	0	0
Other expenses from operations		0	0	0	0
Selling, general and administrative		8	3	21	11
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		82	72	244	216
Total Expenses		90	75	265	227
Income (loss) before income tax benefit (expense)		(48)	(72)	(202)	(209)
Income tax expense		50	8	72	25
Net income (loss)		(98)	(80)	(274)	(234)
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Net income (loss) attributable to Icahn Enterprises		(98)	(80)	(274)	(234)
Supplemental Income Statement Elements [Abstract]
Capital expenditures		0	0	0	0
Depreciation and amortization(1)	[1]	$ 0	$ 0	$ 0	$ 0
[1] Excludes amounts related to the amortization of deferred financing costs and debt discounts and premiums included in interest expense in the amounts of $4 million and $6 million for the three months ended September 30, 2017 and 2016, respectively, and $13 million and $14 million for the nine months ended September 30, 2017 and 2016, respectively.

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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