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Segment Reporting, Income Statements (Details) - USD ($) $ in Millions	3 Months Ended																12 Months Ended
	Dec. 31, 2017	[1]	Sep. 30, 2017	[1]	Jun. 30, 2017	[1]	Mar. 31, 2017	[1]	Dec. 31, 2016	[1]	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Net sales	$ 4,410		$ 4,292		$ 4,282		$ 4,319		$ 3,965		$ 3,904		$ 4,094		$ 3,548		$ 17,303	$ 15,511	$ 14,604
Other revenues from operations																	1,827	1,958	1,386
Net gain (loss) from investment activities																	304	(1,373)	(987)
Interest and dividend income																	136	131	194
Gain on disposition of assets, net																	2,166	14	40
Other (loss) income, net																	8	107	35
Total revenues	4,733		5,680		6,654		4,677		3,972		4,899		4,350		3,127		21,744	16,348	15,272
Expenses:
Cost of goods sold																	15,005	13,412	12,741
Other expenses from operations																	1,041	1,159	643
Selling, general and administrative																	2,565	2,342	1,908
Restructuring																	25	32	97
Impairment																	112	709	788
Interest expense																	843	878	1,154
Total Expenses																	19,591	18,532	17,331
Income before income tax benefit (expense)																	2,153	(2,184)	(2,059)
Income tax (expense) benefit																	(438)	36	68
Net income (loss)	197		829		1,725		(160)		(564)		238		(285)		(1,609)		2,591	(2,220)	(2,127)
Less: net income (loss) attributable to non-controlling interests	101		(232)		(172)		142		358		(254)		216		772		161	(1,092)	(933)
Net income (loss) attributable to Icahn Enterprises	$ 298		$ 597		$ 1,553		$ (18)		$ (206)		$ (16)		$ (69)		$ (837)		2,430	(1,128)	(1,194)
Supplemental information:
Capital expenditures																	991	826	1,359
Depreciation and amortization																	1,002	1,014	849
Amortization included in interest expense																	15	20	14
Investment Segment
Revenues:
Net sales																	0	0	0
Other revenues from operations																	0	0	0
Net gain (loss) from investment activities																	241	(1,388)	(1,041)
Interest and dividend income																	106	112	178
Gain on disposition of assets, net																	0	0	0
Other (loss) income, net																	(50)	53	(2)
Total revenues																	297	(1,223)	(865)
Expenses:
Cost of goods sold																	0	0	0
Other expenses from operations																	0	0	0
Selling, general and administrative																	13	34	237
Restructuring																	0	0	0
Impairment																	0	0	0
Interest expense																	166	230	563
Total Expenses																	179	264	800
Income before income tax benefit (expense)																	118	(1,487)	(1,665)
Income tax (expense) benefit																	0	0	0
Net income (loss)																	118	(1,487)	(1,665)
Less: net income (loss) attributable to non-controlling interests																	38	(883)	(905)
Net income (loss) attributable to Icahn Enterprises																	80	(604)	(760)
Supplemental information:
Capital expenditures																	0	0	0
Depreciation and amortization																	0	0	0
Automotive Segment
Revenues:
Net sales																	9,957	9,420	7,789
Other revenues from operations																	487	422	0
Net gain (loss) from investment activities																	0	0	0
Interest and dividend income																	6	4	6
Gain on disposition of assets, net																	12	9	0
Other (loss) income, net																	66	73	58
Total revenues																	10,528	9,928	7,853
Expenses:
Cost of goods sold																	8,110	7,658	6,577
Other expenses from operations																	436	430	0
Selling, general and administrative																	1,802	1,521	1,001
Restructuring																	21	27	89
Impairment																	40	18	344
Interest expense																	167	157	144
Total Expenses																	10,576	9,811	8,155
Income before income tax benefit (expense)																	(48)	117	(302)
Income tax (expense) benefit																	674	(40)	(50)
Net income (loss)																	626	77	(352)
Less: net income (loss) attributable to non-controlling interests																	11	24	(53)
Net income (loss) attributable to Icahn Enterprises																	615	53	(299)
Supplemental information:
Capital expenditures																	479	418	449
Depreciation and amortization																	508	473	346
Energy Segment
Revenues:
Net sales																	5,988	4,782	5,433
Other revenues from operations																	0	0	0
Net gain (loss) from investment activities																	0	5	36
Interest and dividend income																	1	1	2
Gain on disposition of assets, net																	(3)	0	(2)
Other (loss) income, net																	(68)	(24)	(27)
Total revenues																	5,918	4,764	5,442
Expenses:
Cost of goods sold																	5,727	4,618	4,949
Other expenses from operations																	0	0	0
Selling, general and administrative																	144	138	127
Restructuring																	0	0	0
Impairment																	0	574	253
Interest expense																	110	83	47
Total Expenses																	5,981	5,413	5,376
Income before income tax benefit (expense)																	(63)	(649)	66
Income tax (expense) benefit																	338	45	(59)
Net income (loss)																	275	(604)	7
Less: net income (loss) attributable to non-controlling interests																	46	(277)	(18)
Net income (loss) attributable to Icahn Enterprises																	229	(327)	25
Supplemental information:
Capital expenditures																	119	133	219
Depreciation and amortization																	278	258	229
Railcar Segment
Revenues:
Net sales																	265	430	440
Other revenues from operations																	370	522	499
Net gain (loss) from investment activities																	2	0	0
Interest and dividend income																	2	2	2
Gain on disposition of assets, net																	1,664	3	4
Other (loss) income, net																	3	5	3
Total revenues																	2,306	962	948
Expenses:
Cost of goods sold																	249	366	338
Other expenses from operations																	134	223	201
Selling, general and administrative																	47	48	45
Restructuring																	0	0	0
Impairment																	68	0	0
Interest expense																	45	85	82
Total Expenses																	543	722	666
Income before income tax benefit (expense)																	1,763	240	282
Income tax (expense) benefit																	(496)	(57)	(69)
Net income (loss)																	1,267	183	213
Less: net income (loss) attributable to non-controlling interests																	53	33	76
Net income (loss) attributable to Icahn Enterprises																	1,214	150	137
Supplemental information:
Capital expenditures																	173	133	522
Depreciation and amortization																	65	134	127
Gaming Segment
Revenues:
Net sales																	0	0	0
Other revenues from operations																	898	944	811
Net gain (loss) from investment activities																	0	0	0
Interest and dividend income																	1	1	1
Gain on disposition of assets, net																	(4)	0	(1)
Other (loss) income, net																	65	3	0
Total revenues																	960	948	811
Expenses:
Cost of goods sold																	0	0	0
Other expenses from operations																	425	460	396
Selling, general and administrative																	379	440	338
Restructuring																	0	0	0
Impairment																	0	106	0
Interest expense																	11	13	12
Total Expenses																	815	1,019	746
Income before income tax benefit (expense)																	145	(71)	65
Income tax (expense) benefit																	(93)	(24)	(27)
Net income (loss)																	52	(95)	38
Less: net income (loss) attributable to non-controlling interests																	13	14	12
Net income (loss) attributable to Icahn Enterprises																	39	(109)	26
Supplemental information:
Capital expenditures																	112	85	94
Depreciation and amortization																	73	71	63
Metals Segment
Revenues:
Net sales																	409	267	361
Other revenues from operations																	0	0	0
Net gain (loss) from investment activities																	0	0	0
Interest and dividend income																	0	0	0
Gain on disposition of assets, net																	0	1	0
Other (loss) income, net																	(1)	1	4
Total revenues																	408	269	365
Expenses:
Cost of goods sold																	389	284	406
Other expenses from operations																	0	0	0
Selling, general and administrative																	19	18	20
Restructuring																	1	2	2
Impairment																	0	1	20
Interest expense																	0	0	0
Total Expenses																	409	305	448
Income before income tax benefit (expense)																	(1)	(36)	(83)
Income tax (expense) benefit																	(43)	16	32
Net income (loss)																	(44)	(20)	(51)
Less: net income (loss) attributable to non-controlling interests																	0	0	0
Net income (loss) attributable to Icahn Enterprises																	(44)	(20)	(51)
Supplemental information:
Capital expenditures																	30	5	24
Depreciation and amortization																	20	22	29
Mining Segment
Revenues:
Net sales																	94	71	30
Other revenues from operations																	0	0	0
Net gain (loss) from investment activities																	0	0	0
Interest and dividend income																	1	2	1
Gain on disposition of assets, net																	0	0	0
Other (loss) income, net																	(2)	(10)	(3)
Total revenues																	93	63	28
Expenses:
Cost of goods sold																	60	56	38
Other expenses from operations																	0	0	0
Selling, general and administrative																	14	22	12
Restructuring																	0	0	0
Impairment																	0	0	169
Interest expense																	6	7	3
Total Expenses																	80	85	222
Income before income tax benefit (expense)																	13	(22)	(194)
Income tax (expense) benefit																	(3)	(2)	(1)
Net income (loss)																	10	(24)	(195)
Less: net income (loss) attributable to non-controlling interests																	1	(5)	45
Net income (loss) attributable to Icahn Enterprises																	9	(19)	(150)
Supplemental information:
Capital expenditures																	38	22	20
Depreciation and amortization																	5	6	8
Food Packaging Segment
Revenues:
Net sales																	392	329	344
Other revenues from operations																	0	0	0
Net gain (loss) from investment activities																	0	0	0
Interest and dividend income																	0	0	0
Gain on disposition of assets, net																	0	0	(1)
Other (loss) income, net																	1	3	(6)
Total revenues																	393	332	337
Expenses:
Cost of goods sold																	297	249	263
Other expenses from operations																	0	0	0
Selling, general and administrative																	65	52	50
Restructuring																	2	3	5
Impairment																	1	0	0
Interest expense																	13	12	12
Total Expenses																	378	316	330
Income before income tax benefit (expense)																	15	16	7
Income tax (expense) benefit																	(21)	(8)	(10)
Net income (loss)																	(6)	8	(3)
Less: net income (loss) attributable to non-controlling interests																	(1)	2	0
Net income (loss) attributable to Icahn Enterprises																	(5)	6	(3)
Supplemental information:
Capital expenditures																	26	18	22
Depreciation and amortization																	25	20	19
Real Estate Segment
Revenues:
Net sales																	15	17	14
Other revenues from operations																	72	70	76
Net gain (loss) from investment activities																	0	0	0
Interest and dividend income																	7	0	0
Gain on disposition of assets, net																	496	1	40
Other (loss) income, net																	0	0	1
Total revenues																	590	88	131
Expenses:
Cost of goods sold																	11	13	7
Other expenses from operations																	46	46	46
Selling, general and administrative																	10	10	13
Restructuring																	0	0	0
Impairment																	2	5	2
Interest expense																	2	2	2
Total Expenses																	71	76	70
Income before income tax benefit (expense)																	519	12	61
Income tax (expense) benefit																	0	0	0
Net income (loss)																	519	12	61
Less: net income (loss) attributable to non-controlling interests																	0	0	0
Net income (loss) attributable to Icahn Enterprises																	519	12	61
Supplemental information:
Capital expenditures																	9	1	3
Depreciation and amortization																	20	22	21
Home Fashion Segment
Revenues:
Net sales																	183	195	193
Other revenues from operations																	0	0	0
Net gain (loss) from investment activities																	0	0	0
Interest and dividend income																	0	0	0
Gain on disposition of assets, net																	0	0	0
Other (loss) income, net																	0	1	1
Total revenues																	183	196	194
Expenses:
Cost of goods sold																	162	168	163
Other expenses from operations																	0	0	0
Selling, general and administrative																	39	38	34
Restructuring																	1	0	1
Impairment																	1	2	0
Interest expense																	0	0	0
Total Expenses																	203	208	198
Income before income tax benefit (expense)																	(20)	(12)	(4)
Income tax (expense) benefit																	0	0	0
Net income (loss)																	(20)	(12)	(4)
Less: net income (loss) attributable to non-controlling interests																	0	0	0
Net income (loss) attributable to Icahn Enterprises																	(20)	(12)	(4)
Supplemental information:
Capital expenditures																	5	11	6
Depreciation and amortization																	8	8	7
Holding Company
Revenues:
Net sales																	0	0	0
Other revenues from operations																	0	0	0
Net gain (loss) from investment activities																	61	10	18
Interest and dividend income																	12	9	4
Gain on disposition of assets, net																	1	0	0
Other (loss) income, net																	(6)	2	6
Total revenues																	68	21	28
Expenses:
Cost of goods sold																	0	0	0
Other expenses from operations																	0	0	0
Selling, general and administrative																	33	21	31
Restructuring																	0	0	0
Impairment																	0	3	0
Interest expense																	323	289	289
Total Expenses																	356	313	320
Income before income tax benefit (expense)																	(288)	(292)	(292)
Income tax (expense) benefit																	82	34	116
Net income (loss)																	(206)	(258)	(176)
Less: net income (loss) attributable to non-controlling interests																	0	0	0
Net income (loss) attributable to Icahn Enterprises																	(206)	(258)	(176)
Supplemental information:
Capital expenditures																	0	0	0
Depreciation and amortization																	$ 0	$ 0	$ 0
[1] The comparability of our quarterly financial data is affected by, among other things, (i) the performance of the Investment Funds, (ii) various acquisitions, primarily the acquisition of Pep Boys during the first quarter of 2016, (iii) certain dispositions of assets, primarily during the second and fourth quarters of 2017, (iv) impairment charges and (v) the enactment of U.S. tax law changes in the fourth quarter of 2017.

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

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