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Condensed Statement of Operations By Reporting Segment (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Net sales		$ 4,282	$ 4,094	$ 8,601	$ 7,642
Other revenues from operations		487	523	962	969
Net gain from investment activities		314	(308)	184	(1,244)
Interest and dividend income		33	28	62	70
Gain on disposition of assets, net		1,525	1	1,520	11
Other income, net		13	12	2	29
Total Revenues		6,654	4,350	11,331	7,477
Expenses:
Cost of goods sold		3,723	3,448	7,415	6,571
Other expenses from operations		278	314	532	560
Selling, general and administrative		623	615	1,250	1,133
Restructuring, net		2	6	9	21
Impairment		69	0	77	577
Interest expense		218	202	441	443
Total Expenses		4,913	4,585	9,724	9,305
Income (loss) before income tax benefit (expense)		1,741	(235)	1,607	(1,828)
Income tax expense		(16)	(50)	(42)	(66)
Net income (loss)		1,725	(285)	1,565	(1,894)
Less: net income (loss) attributable to non-controlling interests		172	(216)	30	(988)
Net income (loss) attributable to Icahn Enterprises		1,553	(69)	1,535	(906)
Supplemental Income Statement Elements [Abstract]
Capital expenditures		239	211	470	421
Depreciation and amortization(1)	[1]	252	251	495	481
Amortization included in interest expense		4	4	9	8
Investment Segment
Revenues:
Net sales		0	0	0	0
Other revenues from operations		0	0	0	0
Net gain from investment activities		294	(308)	166	(1,253)
Interest and dividend income		27	22	53	60
Gain on disposition of assets, net		0	0	0	0
Other income, net		0	(1)	(41)	(2)
Total Revenues		321	(287)	178	(1,195)
Expenses:
Cost of goods sold		0	0	0	0
Other expenses from operations		0	0	0	0
Selling, general and administrative		3	19	5	7
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		45	45	92	132
Total Expenses		48	64	97	139
Income (loss) before income tax benefit (expense)		273	(351)	81	(1,334)
Income tax expense		0	0	0	0
Net income (loss)		273	(351)	81	(1,334)
Less: net income (loss) attributable to non-controlling interests		176	(244)	7	(777)
Net income (loss) attributable to Icahn Enterprises		97	(107)	74	(557)
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		2,518	2,473	4,995	4,794
Other revenues from operations		125	118	233	198
Net gain from investment activities		0	0	0	0
Interest and dividend income		1	1	1	2
Gain on disposition of assets, net		5	0	3	9
Other income, net		12	22	30	37
Total Revenues		2,661	2,614	5,262	5,040
Expenses:
Cost of goods sold		2,027	1,986	4,023	3,898
Other expenses from operations		120	125	219	201
Selling, general and administrative		435	399	865	749
Restructuring, net		0	6	7	21
Impairment		2	0	8	3
Interest expense		42	38	82	77
Total Expenses		2,626	2,554	5,204	4,949
Income (loss) before income tax benefit (expense)		35	60	58	91
Income tax expense		(511)	18	(518)	21
Net income (loss)		546	42	576	70
Less: net income (loss) attributable to non-controlling interests		3	7	6	14
Net income (loss) attributable to Icahn Enterprises		543	35	570	56
Supplemental Income Statement Elements [Abstract]
Capital expenditures		109	109	220	208
Depreciation and amortization(1)	[1]	126	113	247	217
Energy Segment
Revenues:
Net sales		1,435	1,283	2,942	2,189
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
Gain on disposition of assets, net		(1)	0	(1)	0
Other income, net		1	(7)	13	(8)
Total Revenues		1,435	1,276	2,954	2,181
Expenses:
Cost of goods sold		1,416	1,175	2,835	2,102
Other expenses from operations		0	0	0	0
Selling, general and administrative		34	33	70	68
Restructuring, net		0	0	0	0
Impairment		0	0	0	574
Interest expense		27	19	54	30
Total Expenses		1,477	1,227	2,959	2,774
Income (loss) before income tax benefit (expense)		(42)	49	(5)	(593)
Income tax expense		(13)	15	(4)	(13)
Net income (loss)		(29)	34	(1)	(580)
Less: net income (loss) attributable to non-controlling interests		(16)	12	(5)	(249)
Net income (loss) attributable to Icahn Enterprises		(13)	22	4	(331)
Supplemental Income Statement Elements [Abstract]
Capital expenditures		33	35	57	83
Depreciation and amortization(1)	[1]	71	67	138	123
Railcar Segment
Revenues:
Net sales		55	97	116	221
Other revenues from operations		121	133	254	265
Net gain from investment activities		2	0	2	0
Interest and dividend income		1	1	1	2
Gain on disposition of assets, net		1,521	0	1,521	0
Other income, net		0	1	1	3
Total Revenues		1,700	232	1,895	491
Expenses:
Cost of goods sold		50	82	105	184
Other expenses from operations		39	52	82	106
Selling, general and administrative		15	10	29	22
Restructuring, net		0	0	0	0
Impairment		67	0	67	0
Interest expense		15	21	34	44
Total Expenses		186	165	317	356
Income (loss) before income tax benefit (expense)		1,514	67	1,578	135
Income tax expense		507	15	519	33
Net income (loss)		1,007	52	1,059	102
Less: net income (loss) attributable to non-controlling interests		4	8	8	22
Net income (loss) attributable to Icahn Enterprises		1,003	44	1,051	80
Supplemental Income Statement Elements [Abstract]
Capital expenditures		50	23	109	62
Depreciation and amortization(1)	[1]	18	34	36	68
Gaming Segment
Revenues:
Net sales		0	0	0	0
Other revenues from operations		222	254	439	472
Net gain from investment activities		0	0	0	0
Interest and dividend income		0	0	1	0
Gain on disposition of assets, net		0	0	(3)	0
Other income, net		0	0	1	0
Total Revenues		222	254	438	472
Expenses:
Cost of goods sold		0	0	0	0
Other expenses from operations		107	125	208	231
Selling, general and administrative		91	114	193	211
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		3	3	6	6
Total Expenses		201	242	407	448
Income (loss) before income tax benefit (expense)		21	12	31	24
Income tax expense		7	4	21	10
Net income (loss)		14	8	10	14
Less: net income (loss) attributable to non-controlling interests		4	2	11	5
Net income (loss) attributable to Icahn Enterprises		10	6	(1)	9
Supplemental Income Statement Elements [Abstract]
Capital expenditures		31	32	53	48
Depreciation and amortization(1)	[1]	17	18	35	35
Metals Segment
Revenues:
Net sales		102	76	205	134
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	1	0	1
Other income, net		0	0	0	0
Total Revenues		102	77	205	135
Expenses:
Cost of goods sold		98	75	194	139
Other expenses from operations		0	0	0	0
Selling, general and administrative		4	6	9	10
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		0	0	0	0
Total Expenses		102	81	203	149
Income (loss) before income tax benefit (expense)		0	(4)	2	(14)
Income tax expense		(1)	(3)	(1)	(7)
Net income (loss)		1	(1)	3	(7)
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Net income (loss) attributable to Icahn Enterprises		1	(1)	3	(7)
Supplemental Income Statement Elements [Abstract]
Capital expenditures		1	1	3	2
Depreciation and amortization(1)	[1]	5	5	10	11
Mining segment
Revenues:
Net sales		22	21	55	31
Other revenues from operations		0	0	0	0
Net gain from investment activities		0	0	0	0
Interest and dividend income		1	1	1	1
Gain on disposition of assets, net		0	0	0	0
Other income, net		1	(5)	(1)	(8)
Total Revenues		24	17	55	24
Expenses:
Cost of goods sold		13	16	30	30
Other expenses from operations		0	0	0	0
Selling, general and administrative		2	4	8	8
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		1	2	3	3
Total Expenses		16	22	41	41
Income (loss) before income tax benefit (expense)		8	(5)	14	(17)
Income tax expense		2	0	2	1
Net income (loss)		6	(5)	12	(18)
Less: net income (loss) attributable to non-controlling interests		1	(1)	2	(4)
Net income (loss) attributable to Icahn Enterprises		5	(4)	10	(14)
Supplemental Income Statement Elements [Abstract]
Capital expenditures		8	3	17	5
Depreciation and amortization(1)	[1]	1	0	2	1
Food Packaging Segment
Revenues:
Net sales		99	85	189	162
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, net		(1)	1	(1)	5
Total Revenues		98	86	188	167
Expenses:
Cost of goods sold		75	63	143	124
Other expenses from operations		0	0	0	0
Selling, general and administrative		17	15	33	27
Restructuring, net		2	0	2	0
Impairment		0	0	0	0
Interest expense		4	3	7	6
Total Expenses		98	81	185	157
Income (loss) before income tax benefit (expense)		0	5	3	10
Income tax expense		0	3	1	4
Net income (loss)		0	2	2	6
Less: net income (loss) attributable to non-controlling interests		0	0	1	1
Net income (loss) attributable to Icahn Enterprises		0	2	1	5
Supplemental Income Statement Elements [Abstract]
Capital expenditures		6	3	9	6
Depreciation and amortization(1)	[1]	7	6	13	11
Real Estate Segment
Revenues:
Net sales		6	6	7	8
Other revenues from operations		19	18	36	34
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	1
Other income, net		0	0	0	0
Total Revenues		25	24	43	43
Expenses:
Cost of goods sold		4	5	5	6
Other expenses from operations		12	12	23	22
Selling, general and administrative		4	2	6	5
Restructuring, net		0	0	0	0
Impairment		0	0	2	0
Interest expense		1	0	1	1
Total Expenses		21	19	37	34
Income (loss) before income tax benefit (expense)		4	5	6	9
Income tax expense		0	0	0	0
Net income (loss)		4	5	6	9
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Net income (loss) attributable to Icahn Enterprises		4	5	6	9
Supplemental Income Statement Elements [Abstract]
Capital expenditures		0	0	0	0
Depreciation and amortization(1)	[1]	5	6	10	11
Home Fashion Segment
Revenues:
Net sales		45	53	92	103
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, net		0	0	0	1
Total Revenues		45	53	92	104
Expenses:
Cost of goods sold		40	46	80	88
Other expenses from operations		0	0	0	0
Selling, general and administrative		9	9	19	18
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		0	0	0	0
Total Expenses		49	55	99	106
Income (loss) before income tax benefit (expense)		(4)	(2)	(7)	(2)
Income tax expense		0	0	0	0
Net income (loss)		(4)	(2)	(7)	(2)
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Net income (loss) attributable to Icahn Enterprises		(4)	(2)	(7)	(2)
Supplemental Income Statement Elements [Abstract]
Capital expenditures		1	5	2	7
Depreciation and amortization(1)	[1]	2	2	4	4
Holding Company
Revenues:
Net sales		0	0	0	0
Other revenues from operations		0	0	0	0
Net gain from investment activities		18	0	16	9
Interest and dividend income		3	3	5	5
Gain on disposition of assets, net		0	0	0	0
Other income, net		0	1	0	1
Total Revenues		21	4	21	15
Expenses:
Cost of goods sold		0	0	0	0
Other expenses from operations		0	0	0	0
Selling, general and administrative		9	4	13	8
Restructuring, net		0	0	0	0
Impairment		0	0	0	0
Interest expense		80	71	162	144
Total Expenses		89	75	175	152
Income (loss) before income tax benefit (expense)		(68)	(71)	(154)	(137)
Income tax expense		25	(2)	22	17
Net income (loss)		(93)	(69)	(176)	(154)
Less: net income (loss) attributable to non-controlling interests		0	0	0	0
Net income (loss) attributable to Icahn Enterprises		(93)	(69)	(176)	(154)
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 $4 million for the three months ended June 30, 2017 and 2016, respectively, and $9 million and $8 million for the six months ended June 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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