Condensed Statement of Operations By Reporting Segment (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) reporting_segments	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Total assets		$ 36,452		$ 36,452		$ 35,780
Number of reporting segments | reporting_segments				10
Revenues:
Net sales		3,720	$ 4,557	$ 11,264	$ 14,090
Other revenues from operations		366	350	1,042	934
Net gain from investment activities		(947)	(592)	236	509
Interest and dividend income		36	62	136	165
Other (loss) income, net		37	45	29	93
Total Revenues		3,212	4,422	12,707	15,791
Expenses:
Cost of goods sold		3,224	4,218	9,673	12,687
Other expenses from operations		168	166	484	458
Selling, general and administrative		418	431	1,423	1,247
Restructuring		18	23	57	61
Impairment		6	4	10	6
Interest expense		296	226	853	593
Total Expenses		4,130	5,068	12,500	15,052
Income before income tax expense		(918)	(646)	207	739
Income tax (expense) benefit		(22)	19	(184)	(166)
Net (loss) income		(940)	(627)	23	573
Less: net loss (income) attributable to non-controlling interests		500	272	(90)	(468)
Net (loss) income attributable to Icahn Enterprises		(440)	(355)	(67)	105
Supplemental information:
Capital expenditures		338	399	1,067	986
Depreciation and amortization	[1]	217	202	630	584
Amortization included in interest expense		5	4	11	17
Investment Segment [Member]
Segment Reporting Information [Line Items]
Total assets		15,474		15,474		15,460
Revenues:
Net sales		0	0	0	0
Other revenues from operations		0	0	0	0
Net gain from investment activities		(948)	(501)	231	648
Interest and dividend income		32	58	125	154
Other (loss) income, net		(1)	(1)	(1)	1
Total Revenues		(917)	(444)	355	803
Expenses:
Cost of goods sold		0	0	0	0
Other expenses from operations		0	0	0	0
Selling, general and administrative		(24)	37	206	147
Restructuring		0	0	0	0
Impairment		0	0	0	0
Interest expense		148	87	412	189
Total Expenses		124	124	618	336
Income before income tax expense		(1,041)	(568)	(263)	467
Income tax (expense) benefit		0	0	0	0
Net (loss) income		(1,041)	(568)	(263)	467
Less: net loss (income) attributable to non-controlling interests		562	298	144	(231)
Net (loss) income attributable to Icahn Enterprises		(479)	(270)	(119)	236
Supplemental information:
Capital expenditures		0	0	0	0
Depreciation and amortization	[1]	0	0	0	0
Automotive Segment [Member]
Segment Reporting Information [Line Items]
Total assets		8,444		8,444		7,529
Revenues:
Net sales		1,980	1,871	5,831	5,522
Other revenues from operations		0	0	0	0
Net gain from investment activities		0	0	0	0
Interest and dividend income		1	1	4	3
Other (loss) income, net		6	18	41	(1)
Total Revenues		1,987	1,890	5,876	5,524
Expenses:
Cost of goods sold		1,660	1,609	4,950	4,689
Other expenses from operations		0	0	0	0
Selling, general and administrative		269	222	722	622
Restructuring		18	25	57	63
Impairment		6	1	10	3
Interest expense		37	35	107	92
Total Expenses		1,990	1,892	5,846	5,469
Income before income tax expense		(3)	(2)	30	55
Income tax (expense) benefit		7	(1)	30	(27)
Net (loss) income		(10)	(1)	0	28
Less: net loss (income) attributable to non-controlling interests		(1)	3	(4)	(7)
Net (loss) income attributable to Icahn Enterprises		(11)	2	(4)	21
Supplemental information:
Capital expenditures		111	109	328	282
Depreciation and amortization	[1]	89	88	257	251
Energy Segment [Member]
Segment Reporting Information [Line Items]
Total assets		5,410		5,410		5,334
Revenues:
Net sales		1,409	2,280	4,422	7,268
Other revenues from operations		0	0	0	0
Net gain from investment activities		0	2	36	(1)
Interest and dividend income		0	1	1	2
Other (loss) income, net		13	26	(51)	171
Total Revenues		1,422	2,309	4,408	7,440
Expenses:
Cost of goods sold		1,270	2,251	3,839	6,856
Other expenses from operations		0	0	0	0
Selling, general and administrative		34	39	99	106
Restructuring		0	0	0	0
Impairment		0	0	0	0
Interest expense		12	10	36	28
Total Expenses		1,316	2,300	3,974	6,990
Income before income tax expense		106	9	434	450
Income tax (expense) benefit		17	(2)	87	(100)
Net (loss) income		89	11	347	350
Less: net loss (income) attributable to non-controlling interests		(39)	(8)	(166)	(165)
Net (loss) income attributable to Icahn Enterprises		50	3	181	185
Supplemental information:
Capital expenditures		55	56	142	171
Depreciation and amortization	[1]	56	54	172	162
Metals Segment [Member]
Segment Reporting Information [Line Items]
Total assets		274		274		315
Revenues:
Net sales		92	186	301	563
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
Other (loss) income, net		0	1	3	1
Total Revenues		92	187	304	564
Expenses:
Cost of goods sold		102	188	328	571
Other expenses from operations		0	0	0	0
Selling, general and administrative		5	5	15	17
Restructuring		0	0	0	0
Impairment		0	0	0	0
Interest expense		0	0	0	0
Total Expenses		107	193	343	588
Income before income tax expense		(15)	(6)	(39)	(24)
Income tax (expense) benefit		(7)	(3)	(17)	11
Net (loss) income		(8)	(3)	(22)	(13)
Less: net loss (income) attributable to non-controlling interests		0	0	0	0
Net (loss) income attributable to Icahn Enterprises		(8)	(3)	(22)	(13)
Supplemental information:
Capital expenditures		4	17	23	24
Depreciation and amortization	[1]	8	7	22	19
Railcar Segment [Member]
Segment Reporting Information [Line Items]
Total assets		3,370		3,370		3,120
Revenues:
Net sales		92	74	281	314
Other revenues from operations		126	108	367	302
Net gain from investment activities		0	0	0	0
Interest and dividend income		1	1	2	2
Other (loss) income, net		3	(1)	5	(4)
Total Revenues		222	182	655	614
Expenses:
Cost of goods sold		69	55	208	242
Other expenses from operations		51	44	151	131
Selling, general and administrative		12	11	31	33
Restructuring		0	0	0	0
Impairment		0	0	0	0
Interest expense		20	16	61	43
Total Expenses		152	126	451	449
Income before income tax expense		70	56	204	165
Income tax (expense) benefit		16	12	50	(38)
Net (loss) income		54	44	154	127
Less: net loss (income) attributable to non-controlling interests		(19)	(15)	(56)	(47)
Net (loss) income attributable to Icahn Enterprises		35	29	98	80
Supplemental information:
Capital expenditures		133	188	463	438
Depreciation and amortization	[1]	32	27	93	78
Gaming Segment [Member]
Segment Reporting Information [Line Items]
Total assets		1,297		1,297		1,260
Revenues:
Net sales		0	0	0	0
Other revenues from operations		219	220	615	571
Net gain from investment activities		0	0	0	0
Interest and dividend income		1	1	1	2
Other (loss) income, net		0	(1)	(1)	37
Total Revenues		220	220	615	610
Expenses:
Cost of goods sold		0	0	0	0
Other expenses from operations		104	108	297	288
Selling, general and administrative		84	90	253	242
Restructuring		0	0	0	0
Impairment		0	0	0	0
Interest expense		3	4	9	10
Total Expenses		191	202	559	540
Income before income tax expense		29	18	56	70
Income tax (expense) benefit		12	5	23	(18)
Net (loss) income		17	13	33	52
Less: net loss (income) attributable to non-controlling interests		(5)	(5)	(10)	(17)
Net (loss) income attributable to Icahn Enterprises		12	8	23	35
Supplemental information:
Capital expenditures		16	23	77	52
Depreciation and amortization	[1]	17	14	46	36
Mining Segment [Member]
Segment Reporting Information [Line Items]
Total assets		391		391		0
Revenues:
Net sales		12	0	18	0
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
Other (loss) income, net		(2)	0	(3)	0
Total Revenues		11	0	16	0
Expenses:
Cost of goods sold		14	0	20	0
Other expenses from operations		0	0	0	0
Selling, general and administrative		5	0	7	0
Restructuring		0	0	0	0
Impairment		0	0	0	0
Interest expense		0	0	1	0
Total Expenses		19	0	28	0
Income before income tax expense		(8)	0	(12)	0
Income tax (expense) benefit		1	0	(1)	0
Net (loss) income		(7)	0	(13)	0
Less: net loss (income) attributable to non-controlling interests		1	0	3	0
Net (loss) income attributable to Icahn Enterprises		(6)	0	(10)	0
Supplemental information:
Capital expenditures		12	0	14	0
Depreciation and amortization	[1]	3	0	4	0
Food Packaging Segment [Member]
Segment Reporting Information [Line Items]
Total assets		430		430		436
Revenues:
Net sales		86	95	262	276
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
Other (loss) income, net		(5)	(1)	(8)	(16)
Total Revenues		81	94	254	260
Expenses:
Cost of goods sold		68	73	201	208
Other expenses from operations		0	0	0	0
Selling, general and administrative		14	13	37	35
Restructuring		0	0	0	0
Impairment		0	0	0	0
Interest expense		3	3	9	11
Total Expenses		85	89	247	254
Income before income tax expense		(4)	5	7	6
Income tax (expense) benefit		0	3	5	(4)
Net (loss) income		(4)	2	2	2
Less: net loss (income) attributable to non-controlling interests		1	(1)	(1)	(1)
Net (loss) income attributable to Icahn Enterprises		(3)	1	1	1
Supplemental information:
Capital expenditures		6	6	15	16
Depreciation and amortization	[1]	6	5	15	16
Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Total assets		708		708		745
Revenues:
Net sales		1	5	2	13
Other revenues from operations		21	22	60	61
Net gain from investment activities		0	0	0	0
Interest and dividend income		0	0	0	0
Other (loss) income, net		20	0	41	3
Total Revenues		42	27	103	77
Expenses:
Cost of goods sold		0	3	1	7
Other expenses from operations		13	14	36	39
Selling, general and administrative		4	4	9	10
Restructuring		0	0	0	0
Impairment		0	3	0	3
Interest expense		1	0	2	2
Total Expenses		18	24	48	61
Income before income tax expense		24	3	55	16
Income tax (expense) benefit		0	0	0	0
Net (loss) income		24	3	55	16
Less: net loss (income) attributable to non-controlling interests		0	0	0	0
Net (loss) income attributable to Icahn Enterprises		24	3	55	16
Supplemental information:
Capital expenditures		0	0	1	1
Depreciation and amortization	[1]	5	6	16	17
Home Fashion Segment [Member]
Segment Reporting Information [Line Items]
Total assets		207		207		208
Revenues:
Net sales		48	46	147	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
Other (loss) income, net		1	2	1	3
Total Revenues		49	48	148	137
Expenses:
Cost of goods sold		41	39	126	114
Other expenses from operations		0	0	0	0
Selling, general and administrative		9	7	25	22
Restructuring		0	(2)	0	(2)
Impairment		0	0	0	0
Interest expense		0	0	0	0
Total Expenses		50	44	151	134
Income before income tax expense		(1)	4	(3)	3
Income tax (expense) benefit		0	0	0	0
Net (loss) income		(1)	4	(3)	3
Less: net loss (income) attributable to non-controlling interests		0	0	0	0
Net (loss) income attributable to Icahn Enterprises		(1)	4	(3)	3
Supplemental information:
Capital expenditures		1	0	4	2
Depreciation and amortization	[1]	1	1	5	5
Holding Company [Member]
Segment Reporting Information [Line Items]
Total assets		447		447		1,373
Revenues:
Net sales		0	0	0	0
Other revenues from operations		0	0	0	0
Net gain from investment activities		1	(93)	(31)	(138)
Interest and dividend income		0	0	2	2
Other (loss) income, net		2	2	2	(102)
Total Revenues		3	(91)	(27)	(238)
Expenses:
Cost of goods sold		0	0	0	0
Other expenses from operations		0	0	0	0
Selling, general and administrative		6	3	19	13
Restructuring		0	0	0	0
Impairment		0	0	0	0
Interest expense		72	71	216	218
Total Expenses		78	74	235	231
Income before income tax expense		(75)	(165)	(262)	(469)
Income tax (expense) benefit		(22)	(33)	5	10
Net (loss) income		(53)	(132)	(267)	(459)
Less: net loss (income) attributable to non-controlling interests		0	0	0	0
Net (loss) income attributable to Icahn Enterprises		(53)	(132)	(267)	(459)
Supplemental information:
Capital expenditures		0	0	0	0
Depreciation and amortization	[1]	0	0	0	0
Icahn Enterprises Holdings [Member]
Segment Reporting Information [Line Items]
Total assets		36,476		36,476		35,803
Revenues:
Net sales		3,720	4,557	11,264	14,090
Other revenues from operations		366	350	1,042	934
Net gain from investment activities		(947)	(592)	236	509
Interest and dividend income		36	62	136	165
Other (loss) income, net		37	45	29	93
Total Revenues		3,212	4,422	12,707	15,791
Expenses:
Cost of goods sold		3,224	4,218	9,673	12,687
Other expenses from operations		168	166	484	458
Selling, general and administrative		418	431	1,423	1,247
Restructuring		18	23	57	61
Impairment		6	4	10	6
Interest expense		296	226	852	592
Total Expenses		4,130	5,068	12,499	15,051
Income before income tax expense		(918)	(646)	208	740
Income tax (expense) benefit		(22)	19	(184)	(166)
Net (loss) income		(940)	(627)	24	574
Less: net loss (income) attributable to non-controlling interests		500	272	(90)	(468)
Net (loss) income attributable to Icahn Enterprises		(440)	(355)	(66)	106
Supplemental information:
Capital expenditures				1,067	986
Amortization included in interest expense		5	4	10	16
Icahn Enterprises Holdings [Member] | Investment Segment [Member]
Segment Reporting Information [Line Items]
Total assets		15,474		15,474		15,460
Expenses:
Interest expense		148	87	412	189
Net (loss) income		(1,041)	(568)	(263)	467
Net (loss) income attributable to Icahn Enterprises		(479)	(270)	(119)	236
Icahn Enterprises Holdings [Member] | Automotive Segment [Member]
Segment Reporting Information [Line Items]
Total assets		8,444		8,444		7,529
Expenses:
Interest expense		37	35	107	92
Net (loss) income		(10)	(1)	0	28
Net (loss) income attributable to Icahn Enterprises		(11)	2	(4)	21
Icahn Enterprises Holdings [Member] | Energy Segment [Member]
Segment Reporting Information [Line Items]
Total assets		5,410		5,410		5,334
Expenses:
Interest expense		12	10	36	28
Net (loss) income		89	11	347	350
Net (loss) income attributable to Icahn Enterprises		50	3	181	185
Icahn Enterprises Holdings [Member] | Metals Segment [Member]
Segment Reporting Information [Line Items]
Total assets		274		274		315
Expenses:
Interest expense		0	0	0	0
Net (loss) income		(8)	(3)	(22)	(13)
Net (loss) income attributable to Icahn Enterprises		(8)	(3)	(22)	(13)
Icahn Enterprises Holdings [Member] | Railcar Segment [Member]
Segment Reporting Information [Line Items]
Total assets		3,370		3,370		3,120
Expenses:
Interest expense		20	16	61	43
Net (loss) income		54	44	154	127
Net (loss) income attributable to Icahn Enterprises		35	29	98	80
Icahn Enterprises Holdings [Member] | Gaming Segment [Member]
Segment Reporting Information [Line Items]
Total assets		1,297		1,297		1,260
Expenses:
Interest expense		3	4	9	10
Net (loss) income		17	13	33	52
Net (loss) income attributable to Icahn Enterprises		12	8	23	35
Icahn Enterprises Holdings [Member] | Mining Segment [Member]
Segment Reporting Information [Line Items]
Total assets		391		391		0
Expenses:
Interest expense		0	0	1	0
Net (loss) income		(7)	0	(13)	0
Net (loss) income attributable to Icahn Enterprises		(6)	0	(10)	0
Icahn Enterprises Holdings [Member] | Food Packaging Segment [Member]
Segment Reporting Information [Line Items]
Total assets		430		430		436
Expenses:
Interest expense		3	3	9	11
Net (loss) income		(4)	2	2	2
Net (loss) income attributable to Icahn Enterprises		(3)	1	1	1
Icahn Enterprises Holdings [Member] | Real Estate Segment [Member]
Segment Reporting Information [Line Items]
Total assets		708		708		745
Expenses:
Interest expense		1	0	2	2
Net (loss) income		24	3	55	16
Net (loss) income attributable to Icahn Enterprises		24	3	55	16
Icahn Enterprises Holdings [Member] | Home Fashion Segment [Member]
Segment Reporting Information [Line Items]
Total assets		207		207		208
Expenses:
Interest expense		0	0	0	0
Net (loss) income		(1)	4	(3)	3
Net (loss) income attributable to Icahn Enterprises		(1)	4	(3)	3
Icahn Enterprises Holdings [Member] | Holding Company [Member]
Segment Reporting Information [Line Items]
Total assets		471		471		$ 1,396
Expenses:
Interest expense		72	71	215	217
Net (loss) income		(53)	(132)	(266)	(458)
Net (loss) income attributable to Icahn Enterprises		$ (53)	$ (132)	$ (266)	$ (458)

[1] Excludes amounts related to the amortization of deferred financing costs and debt discounts and premiums included in interest expense in the amounts of $5 million and $4 million for the three months ended September 30, 2015 and 2014, respectively, and $11 million and $17 million for the nine months ended September 30, 2015 and 2014, respectively.