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(Details)	3 Months Ended
	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 19, 2016 USD ($)
Description of Business [Line Items]
Assets held for sale	$ 1,350,000,000	$ 1,366,000,000
Liabilities held for sale	$ 1,738,000,000	1,779,000,000
Icahn Enterprises Holdings
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary	99.00%
Assets held for sale	$ 1,350,000,000	1,366,000,000
Liabilities held for sale	1,738,000,000	1,779,000,000
Investment Funds
Description of Business [Line Items]
Fair value of interest in subsidiary	$ 1,800,000,000	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	90.10%
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 | 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)			4,800
Cash and cash equivalents held for sale	$ 93,000,000	113,000,000
Property, plant and equipment, net held for sale	1,196,000,000	1,197,000,000
Other assets held for sale	46,000,000	41,000,000
Assets held for sale	1,335,000,000	1,351,000,000
Accounts payable, accrued expenses and other liabilities held for sale	28,000,000	27,000,000
Debt held for sale	1,702,000,000	1,746,000,000
Liabilities held for sale	$ 1,730,000,000	$ 1,773,000,000
Gaming Segment | Tropicana
Description of Business [Line Items]
Percentage of equity ownership in operating subsidiary	72.50%

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