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Description of Business (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 19, 2016 USD ($)
Description of Business [Line Items]
Proceeds from disposition of assets			$ 1,282,000,000	$ 11,000,000
Gain on disposition of assets, net	$ 1,525,000,000	$ 1,000,000	$ 1,520,000,000	11,000,000
Icahn Enterprises Holdings
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			99.00%
Proceeds from disposition of assets			$ 1,282,000,000	11,000,000
Gain on disposition of assets, net	1,525,000,000	1,000,000	1,520,000,000	11,000,000
Investment Funds
Description of Business [Line Items]
Fair value of interest in subsidiary	2,700,000,000		$ 2,700,000,000		$ 1,700,000,000
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%
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			74.60%
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			90.60%
Gaming Segment
Description of Business [Line Items]
Gain on disposition of assets, net	0	0	$ (3,000,000)	0
Gaming Segment | Tropicana
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary			72.50%
Automotive Segment
Description of Business [Line Items]
Gain on disposition of assets, net	5,000,000	0	$ 3,000,000	9,000,000
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			$ 305,000,000
Energy Segment
Description of Business [Line Items]
Gain on disposition of assets, net	(1,000,000)	0	$ (1,000,000)	0
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%
Railcar Segment
Description of Business [Line Items]
Value of business to be disposed of						$ 2,800,000,000
Estimated number of railcars to be disposed of (number of railcars)						29,000
Estimated number of additional railcars with option to sell (number of railcars)						4,600
Expected future proceeds from sale of assets held for sale			$ 559,000,000
Gain on disposition of assets, net	1,521,000,000	0	1,521,000,000	0
Holding Company
Description of Business [Line Items]
Proceeds from disposition of assets			1,300,000,000
Gain on disposition of assets, net	$ 0	$ 0	$ 0	$ 0

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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