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Income Taxes Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Book basis of net assets	$ 2,154	$ 3,987
Book/tax basis difference	1,888	(88)
Tax basis of net assets	4,042	3,899
Current income tax (expense) benefit	(141)	(72)	$ (80)
Deferred income tax (expense) benefit	105	4	183
Income tax benefit (expense)	(36)	(68)	103
Deferred tax assets, Property, pland and equipment	312	341
Deferred tax asset, net operating loss	1,981	1,511
deferred tax asset, Tax credits	139	133
Deferred tax asset, Post-employment benefits, including pensions	334	347
Deferred tax asset, Reoganization costs	7	5
Deferred tax asset, Other	430	418
Deferred Tax Assets, Gross	3,203	2,755
Deferred Tax Assets, Valuation Allowance	(1,821)	(1,444)
Deferred Tax Assets, Net of Valuation Allowance	1,382	1,311
Deferred tax liabilities, Property, plant and equipment	(592)	(354)
Deferred tax liabilities, Intangible assets	(195)	(163)
Deferred tax liability, Investment in partnerships	(1,495)	(1,376)
Deferred tax liabilities, Investment in U.S. subsidiaries	(307)	(307)
Deferred tax liabilities, Other	(101)	(13)
Deferred Tax Liabilities, Gross	(2,690)	(2,213)
deferred tax liabilities, net of deferred tax assets	(1,308)	(902)
Deferred tax asset	305	299
Deferred tax liability	1,613	1,201
Changes in valuation allowance on deferred tax assets	377	385
Cash and cash equivalents	1,833	2,078	2,908	$ 3,257
Income tax expense related to interest and penalties related to unrecognized tax benefits	1	(4)	(11)
Unrecognized tax benefits balance	101	94	113	132
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	70	68	76
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	16	15	19
TER
Income Tax Contingency [Line Items]
Changes in valuation allowance on deferred tax assets	356
Pep Boys
Income Tax Contingency [Line Items]
Changes in valuation allowance on deferred tax assets	59
ARI
Income Tax Contingency [Line Items]
Undistributed earnings of foreign subsidiaries	4	3	3
American Entertainment Properties Corp. [Member]
Income Tax Contingency [Line Items]
Changes in valuation allowance on deferred tax assets		7
Undistributed earnings of foreign subsidiaries	23
Deferred tax asst for tax loss carryforwrds and credits, subject to expiration	1,500
Icahn Enterprises Holdings
Income Tax Contingency [Line Items]
Book basis of net assets	2,179	4,011
Book/tax basis difference	1,888	(88)
Tax basis of net assets	4,067	3,923
Income tax benefit (expense)	(36)	(68)	103
Deferred tax liability	1,613	1,201
Cash and cash equivalents	1,833	2,078	2,908	$ 3,257
Federal-Mogul
Income Tax Contingency [Line Items]
Deferred Tax Assets, Valuation Allowance	(867)
Undistributed earnings of foreign subsidiaries	778
Cash and cash equivalents	300
Cash and cash equivalents held by foreign subsidiaries	166
Deferred tax asst for tax loss carryforwrds and credits, subject to expiration	1,000
Domestic deferred tax asst for tax loss carryforwards and credits, subject to expiration	628
Release of deferred tax allowance			18
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	3
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	3
Tropicana
Income Tax Contingency [Line Items]
Deferred tax asst for tax loss carryforwrds and credits, subject to expiration	148
Viskase
Income Tax Contingency [Line Items]
Undistributed earnings of foreign subsidiaries	81
Domestic deferred tax asst for tax loss carryforwards and credits, subject to expiration	91
Ferrous Resources
Income Tax Contingency [Line Items]
Changes in valuation allowance on deferred tax assets		394
United Kingdom | Federal-Mogul
Income Tax Contingency [Line Items]
Foreign deferred tax asst for tax loss carryforwards and credits, subject to expiration	124
Other foreign jurisdictions | Federal-Mogul
Income Tax Contingency [Line Items]
Foreign deferred tax asst for tax loss carryforwards and credits, subject to expiration	287
Foreign tax authority | Viskase
Income Tax Contingency [Line Items]
Foreign deferred tax asst for tax loss carryforwards and credits, subject to expiration	19
Domestic tax authority
Income Tax Contingency [Line Items]
Current income tax (expense) benefit	(40)	(17)	(45)
Deferred income tax (expense) benefit	73	(15)	201
Foreign tax authority
Income Tax Contingency [Line Items]
Current income tax (expense) benefit	(101)	(55)	(35)
Deferred income tax (expense) benefit	32	19	(18)
Oklahoma | CVR Energy, Inc.
Income Tax Contingency [Line Items]
Domestic tax credits	$ 26
Minimum | American Entertainment Properties Corp. [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	2026
Minimum | Tropicana
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	2027
Minimum | United States | Federal-Mogul
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	2017
Minimum | United States | Viskase
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	2024
Maximum | American Entertainment Properties Corp. [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	2035
Maximum | United States | Federal-Mogul
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	2035
Automotive, Mining and Gaming segments [Member]
Income Tax Contingency [Line Items]
Changes in valuation allowance on deferred tax assets	$ (38)
Automotive Segment
Income Tax Contingency [Line Items]
Income tax benefit (expense)	40	(50)	(91)
Changes in valuation allowance on deferred tax assets		16
Cash and cash equivalents	353	201
Gaming Segment
Income Tax Contingency [Line Items]
Income tax benefit (expense)	24	(27)	147
Cash and cash equivalents	$ 244	$ 217
Valuation allowance, deferred tax asset, change in balance			$ 196

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