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Income Taxes Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Book basis of net assets	$ 5,106	$ 2,154
Book/tax basis difference	(450)	1,888
Tax basis of net assets	4,656	4,042
Domestic income (loss) from continuing operations before taxes	1,933	(2,370)	$ (1,870)
Foreign income (loss) from continuing operations before taxes	220	186	(189)
Income before income tax benefit (expense)	2,153	(2,184)	(2,059)
Current income tax (expense) benefit	(73)	(141)	(72)
Deferred income tax (expense) benefit	511	105	4
Income tax benefit (expense)	438	(36)	(68)
Deferred tax assets, Property, pland and equipment	261	312
Deferred tax asset, net operating loss	1,158	1,981
deferred tax asset, Tax credits	141	139
Deferred tax asset, Post-employment benefits, including pensions	263	334
Deferred tax asset, Reoganization costs	3	7
Deferred tax asset, Other	398	430
Deferred tax assets, gross	2,224	3,203
Deferred Tax Assets, Valuation Allowance	1,293	1,821
Deferred Tax Assets, Net of Valuation Allowance	931	1,382
Deferred tax liabilities, Property, plant and equipment	(467)	(592)
Deferred tax liabilities, Intangible assets	(157)	(195)
Deferred tax liability, Investment in partnerships	(775)	(1,495)
Deferred tax liabilities, Investment in U.S. subsidiaries	(184)	(307)
Deferred tax liabilities, Other	(138)	(101)
Deferred Tax Liabilities, Gross	(1,721)	(2,690)
Deferred tax liabilities, net of deferred tax assets	790	1,308
Deferred tax asset	134	305
Deferred tax liability	924	1,613
Increase (decrease) in deferred tax asset valuation amount	$ (528)
U.S. Federal statutory corporate income tax rate	35.00%
Provisional remeasurement of deferred tax assets and liabilities based on rates at which they are expected to reverse	$ 496
Provisional amount related to one-time transition tax on the mandatory deemed repatriation of foreign earnings	2
Unrecognized tax benefits balance	129	101	94	$ 113
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	29	68	76
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	6	15	19
Income tax expense related to interest and penalties related to unrecognized tax benefits	(9)	(4)	(11)
ARI
Income Tax Contingency [Line Items]
Undistributed earnings of foreign subsidiaries	6	3
Icahn Enterprises Holdings
Income Tax Contingency [Line Items]
Book basis of net assets	5,133	2,179
Book/tax basis difference	(450)	1,888
Tax basis of net assets	4,683	4,067
Income before income tax benefit (expense)	2,155	(2,183)	(2,058)
Income tax benefit (expense)	438	(36)	(68)
Deferred tax liability	924	1,613
Federal-Mogul
Income Tax Contingency [Line Items]
Undistributed earnings of foreign subsidiaries	784
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	2
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	5
American Entertainment Properties Corp.
Income Tax Contingency [Line Items]
Deferred tax assets, Operating loss carryforwards, Subject to expiration	1,000
Viskase
Income Tax Contingency [Line Items]
Undistributed earnings of foreign subsidiaries	46
United Kingdom | American Entertainment Properties Corp.
Income Tax Contingency [Line Items]
Operating loss carryforwards	47
Other Foreign countries | American Entertainment Properties Corp.
Income Tax Contingency [Line Items]
Operating loss carryforwards	287
State and Local Jurisdiction | ARI
Income Tax Contingency [Line Items]
Operating loss carryforwards	31
Kansas | CVR Energy
Income Tax Contingency [Line Items]
Tax credits	9
United States | ARI
Income Tax Contingency [Line Items]
Operating loss carryforwards	54
United States | American Entertainment Properties Corp.
Income Tax Contingency [Line Items]
Operating loss carryforwards	684
United States | Viskase
Income Tax Contingency [Line Items]
Operating loss carryforwards	86
Domestic tax authority
Income Tax Contingency [Line Items]
Current income tax (expense) benefit	(21)	(40)	(17)
Deferred income tax (expense) benefit	525	73	(15)
Foreign tax authority
Income Tax Contingency [Line Items]
Current income tax (expense) benefit	(52)	(101)	(55)
Deferred income tax (expense) benefit	(14)	32	19
Oklahoma | CVR Energy
Income Tax Contingency [Line Items]
Tax credits	30
Automotive Segment
Income Tax Contingency [Line Items]
Income before income tax benefit (expense)	(48)	117	(302)
Income tax benefit (expense)	(674)	40	50
Automotive Segment | Federal-Mogul
Income Tax Contingency [Line Items]
Increase (decrease) in deferred tax asset valuation amount	(491)
Gaming Segment
Income Tax Contingency [Line Items]
Income before income tax benefit (expense)	145	(71)	65
Income tax benefit (expense)	93	24	27
Increase (decrease) in deferred tax asset valuation amount	(77)
Mining Segment
Income Tax Contingency [Line Items]
Income before income tax benefit (expense)	13	(22)	(194)
Income tax benefit (expense)	3	$ 2	$ 1
Increase (decrease) in deferred tax asset valuation amount	(13)
Automotive segment and Holding Company
Income Tax Contingency [Line Items]
Increase (decrease) in deferred tax asset valuation amount	53
Minimum | Other Foreign countries | Viskase
Income Tax Contingency [Line Items]
Operating loss carryforwards	$ 9
Minimum | State and Local Jurisdiction | ARI
Income Tax Contingency [Line Items]
Operating Loss carryforward, year of expiration	2037
Minimum | Kansas | CVR Energy
Income Tax Contingency [Line Items]
Operating Loss carryforward, year of expiration	2032
Minimum | United States | American Entertainment Properties Corp.
Income Tax Contingency [Line Items]
Operating Loss carryforward, year of expiration	2027
Minimum | United States | Viskase
Income Tax Contingency [Line Items]
Operating Loss carryforward, year of expiration	2024
Maximum | Other Foreign countries | Viskase
Income Tax Contingency [Line Items]
Operating loss carryforwards	$ 13
Maximum | United States | American Entertainment Properties Corp.
Income Tax Contingency [Line Items]
Operating Loss carryforward, year of expiration	2037

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