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(Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Description of Business [Line Items]
Payments to acquire additional interest in subsidiaries			$ 0	$ 252
Icahn Enterprises Holdings
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			99.00%
Payments to acquire additional interest in subsidiaries			$ 0	$ 252
Investment Funds
Description of Business [Line Items]
Fair value of interest in subsidiary			$ 3,200		$ 3,000
CVR Refining
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			3.90%
CVR Energy
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			82.00%
ARI
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			62.20%
Tropicana
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			83.90%
Ferrous Resources
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			77.20%
Viskase
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			78.60%
Icahn Enterprises G.P.
Description of Business [Line Items]
General partner ownership percentage in Icahn Enterprises			1.00%
General partner ownership interest in Icahn Enterprises Holdings			1.00%
Aggregate general partner ownership interest of parent and operating subsidiary			1.99%
Mr. Icahn and affiliates
Description of Business [Line Items]
Affiliate ownership interest in Icahn Enterprises			91.00%
Automotive Segment | Federal-Mogul
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			100.00%
Payments to acquire additional interest in subsidiaries		$ 305
Energy Segment | CVR Refining
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			66.00%
Energy Segment | CVR Partners
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			34.00%
Food Packaging Segment | Viskase
Description of Business [Line Items]
Proceeds From Rights Offering	$ 50
Payments to Acquire Interest in Subsidiaries and Affiliates	$ 44

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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