Description of Business	3 Months Ended
Mar. 31, 2019
Description of Business [Abstract]
Description of Business	Description of Business. Overview Icahn Enterprises L.P. (“Icahn Enterprises”) is a master limited partnership formed in Delaware on February 17, 1987. Icahn Enterprises Holdings L.P. (“Icahn Enterprises Holdings”) is a limited partnership formed in Delaware on February 17, 1987. References to "we," "our" or "us" herein include both Icahn Enterprises and Icahn Enterprises Holdings and their subsidiaries, unless the context otherwise requires. Icahn Enterprises owns a 99% limited partner interest in Icahn Enterprises Holdings. Icahn Enterprises G.P. Inc. ("Icahn Enterprises GP"), which is owned and controlled by Mr. Carl C. Icahn, owns a 1% general partner interest in each of Icahn Enterprises and Icahn Enterprises Holdings as of March 31, 2019. Icahn Enterprises Holdings and its subsidiaries own substantially all of our assets and liabilities and conduct substantially all of our operations. Therefore, the financial results of Icahn Enterprises and Icahn Enterprises Holdings are substantially the same, with differences relating primarily to the allocation of the general partner interest, which is reflected as an aggregate 1.99% general partner interest in the financial statements of Icahn Enterprises. In addition to the above, Mr. Icahn and his affiliates owned approximately 91.7% of Icahn Enterprises' outstanding depositary units as of March 31, 2019. Description of Continuing Operating Businesses We are a diversified holding company owning subsidiaries currently engaged in the following continuing operating businesses: Investment, Energy, Automotive, Food Packaging, Metals, Real Estate, Home Fashion and Mining. We also report the results of our Holding Company, which includes the results of certain subsidiaries of Icahn Enterprises and Icahn Enterprises Holdings (unless otherwise noted), and investment activity and expenses associated with our Holding Company. Our historical results also report the results of our Railcar segment through the date we sold our last remaining railcars on lease, which occurred in the third quarter of 2018. See Note 12, "Segment Reporting," for a reconciliation of each of our reporting segment's results of operations to our consolidated results. Certain additional information with respect to our segments is discussed below. Investment Our Investment segment is comprised of various private investment funds ("Investment Funds") in which we have general partner interests and through which we invest our proprietary capital. As general partner, we provide investment advisory and certain administrative and back office services to the Investment Funds but do not provide such services to any other entities, individuals or accounts. We and certain of Mr. Icahn's wholly-owned affiliates are the only investors in the Investment Funds. Interests in the Investment Funds are not offered to outside investors. We had interests in the Investment Funds with a fair value of approximately $4.8 billion and $5.1 billion as of March 31, 2019 and December 31, 2018, respectively. Energy We conduct our Energy segment through our majority owned subsidiary, CVR Energy, Inc. ("CVR Energy"). CVR Energy is a diversified holding company primarily engaged in the petroleum refining and nitrogen fertilizer manufacturing businesses through its holdings in CVR Refining, LP ("CVR Refining") and CVR Partners, LP ("CVR Partners"), respectively. CVR Refining is an independent petroleum refiner and marketer of high value transportation fuels. CVR Partners produces and markets nitrogen fertilizers in the form of urea ammonium nitrate and ammonia. As of March 31, 2019, we owned approximately 70.8% of the total outstanding common stock of CVR Energy. On January 29, 2019, CVR Energy, pursuant to the exercise of its right to purchase all of the issued and outstanding common units in CVR Refining, purchased the remaining common units of CVR Refining not already owned by CVR Energy, including the purchase of CVR Refining common units owned directly by us. Prior to this, CVR Energy owned approximately 80.6% of the common units of CVR Refining and we directly owned approximately 3.9% of the common units of CVR Refining. As a result of exercising its purchase right, as of January 29, 2019, CVR Energy owns all of the common units of CVR Refining and we no longer have any direct ownership in CVR Refining. In addition, the common units of CVR Refining have subsequently ceased to be publicly traded or listed on the New York Stock Exchange any other national securities exchange. The remaining common units of CVR Refining acquired in this transaction were purchased for $241 million, excluding the amount paid by CVR Energy to us for the common units of CVR Refining directly owned by us. Automotive We conduct our Automotive segment through our wholly-owned subsidiary, Icahn Automotive Group LLC ("Icahn Automotive"). Icahn Automotive is engaged in the retail and wholesale distribution of automotive parts in the aftermarket as well as providing automotive repair and maintenance services to its customers. Our Automotive segment also includes our investment in 767 Auto Leasing LLC ("767 Leasing"), a joint venture created to purchase vehicles for lease, as described further in Note 3, "Related Party Transactions." Food Packaging We conduct our Food Packaging segment through our majority owned subsidiary, Viskase Companies, Inc. ("Viskase"). During January 2018, Viskase received $50 million in connection with its common stock rights offering. In connection with this rights offering, we fully exercised our subscription rights under our basic and over subscription privileges to purchase additional shares of Viskase common stock, thereby increasing our ownership of Viskase from 74.6% to 78.6%, for an aggregate additional investment of $44 million. Viskase is a producer of cellulosic, fibrous and plastic casings used to prepare and package processed meat products. Metals We conduct our Metals segment through our wholly-owned subsidiary, PSC Metals LLC (“PSC Metals”). PSC Metals is principally engaged in the business of collecting, processing and selling ferrous and non-ferrous metals, as well as the processing and distribution of steel pipe and plate products. PSC Metals collects industrial and obsolete scrap metal, processes it into reusable forms and supplies the recycled metals to its customers. Real Estate Our Real Estate operations consist primarily of rental real estate, property development and associated club activities. Our rental real estate operations consist primarily of office and industrial properties leased to single corporate tenants. Our property development operations are run primarily through a real estate investment, management and development subsidiary that focuses primarily on the construction and sale of single-family and multi-family homes, lots in subdivisions and planned communities, and raw land for residential development. Our property development locations also operate golf and club operations. In addition, our Real Estate operations also includes a hotel, timeshare and casino resort property in Aruba as well as a casino property in Atlantic City, New Jersey, which ceased operations in 2014 prior to our obtaining control of the property. Home Fashion We conduct our Home Fashion segment through our wholly-owned subsidiary, WestPoint Home LLC (“WPH”). WPH's business consists of manufacturing, sourcing, marketing, distributing and selling home fashion consumer products. Mining We conduct our Mining segment through our majority owned subsidiary, Ferrous Resources Ltd. ("Ferrous Resources"). As of March 31, 2019, we owned approximately 77.2% of the total outstanding common stock of Ferrous Resources. Ferrous Resources acquired certain rights to iron ore mineral resources in Brazil and develops mining operations and related infrastructure to produce and sell iron ore products to the global steel industry. On December 5, 2018, we announced a definitive agreement to sell Ferrous Resources for total consideration of $550 million. The transaction is expected to close in the second half of 2019. This transaction met all the criteria to be classified as held for sale on December 5, 2018 upon execution of the definitive agreement. Railcar We conducted our Railcar segment through our wholly-owned subsidiary, American Railcar Leasing, LLC ("ARL"). ARL operated a leasing business consisting of purchased railcars leased to third parties under operating leases. During 2018, we sold all remaining railcars of ARL not previously sold and as a result, our business no longer includes an active Railcar segment. For the three months ended March 31, 2018, we had proceeds of $15 million in connection with the sale of railcars and we recorded a pretax gain on disposition of assets of $4 million. Description of Discontinued Operating Businesses We also report discontinued operations previously reported in our Automotive and Railcar segments and former Gaming segment. Our discontinued Automotive operations consists of our previously wholly-owned subsidiary, Federal-Mogul LLC ("Federal-Mogul"). Our discontinued Gaming operations consists of our previous majority ownership in Tropicana Entertainment Inc. ("Tropicana"). Our discontinued Railcar operations consists of our previous majority ownership in American Railcar Industries, Inc. ("ARI"). Each of these businesses were sold in the fourth quarter of 2018 and are reflected in discontinued operations for the three months ended March 31, 2018. See Note 13, "Discontinued Operations," for additional information with respect to our discontinued operating businesses.

Icahn Enterprises L.P. (“Icahn Enterprises”) is a master limited partnership formed in Delaware on February 17, 1987. Icahn Enterprises Holdings L.P. (“Icahn Enterprises Holdings”) is a limited partnership formed in Delaware on February 17, 1987. References to "we," "our" or "us" herein include both Icahn Enterprises and Icahn Enterprises Holdings and their subsidiaries, unless the context otherwise requires.

Icahn Enterprises owns a 99% limited partner interest in Icahn Enterprises Holdings. Icahn Enterprises G.P. Inc. ("Icahn Enterprises GP"), which is owned and controlled by Mr. Carl C. Icahn, owns a 1% general partner interest in each of Icahn Enterprises and Icahn Enterprises Holdings as of March 31, 2019. Icahn Enterprises Holdings and its subsidiaries own substantially all of our assets and liabilities and conduct substantially all of our operations. Therefore, the financial results of Icahn Enterprises and Icahn Enterprises Holdings are substantially the same, with differences relating primarily to the allocation of the general partner interest, which is reflected as an aggregate 1.99% general partner interest in the financial statements of Icahn Enterprises. In addition to the above, Mr. Icahn and his affiliates owned approximately 91.7% of Icahn Enterprises' outstanding depositary units as of March 31, 2019.

We are a diversified holding company owning subsidiaries currently engaged in the following continuing operating businesses: Investment, Energy, Automotive, Food Packaging, Metals, Real Estate, Home Fashion and Mining. We also report the results of our Holding Company, which includes the results of certain subsidiaries of Icahn Enterprises and Icahn Enterprises Holdings (unless otherwise noted), and investment activity and expenses associated with our Holding Company. Our historical results also report the results of our Railcar segment through the date we sold our last remaining railcars on lease, which occurred in the third quarter of 2018. See Note 12, "Segment Reporting," for a reconciliation of each of our reporting segment's results of operations to our consolidated results. Certain additional information with respect to our segments is discussed below.

Our Investment segment is comprised of various private investment funds ("Investment Funds") in which we have general partner interests and through which we invest our proprietary capital. As general partner, we provide investment advisory and certain administrative and back office services to the Investment Funds but do not provide such services to any other entities, individuals or accounts. We and certain of Mr. Icahn's wholly-owned affiliates are the only investors in the Investment Funds. Interests in the Investment Funds are not offered to outside investors. We had interests in the Investment Funds with a fair value of approximately $4.8 billion and $5.1 billion as of March 31, 2019 and December 31, 2018, respectively.

We conduct our Energy segment through our majority owned subsidiary, CVR Energy, Inc. ("CVR Energy"). CVR Energy is a diversified holding company primarily engaged in the petroleum refining and nitrogen fertilizer manufacturing businesses through its holdings in CVR Refining, LP ("CVR Refining") and CVR Partners, LP ("CVR Partners"), respectively. CVR Refining is an independent petroleum refiner and marketer of high value transportation fuels. CVR Partners produces and markets nitrogen fertilizers in the form of urea ammonium nitrate and ammonia. As of March 31, 2019, we owned approximately 70.8% of the total outstanding common stock of CVR Energy.

On January 29, 2019, CVR Energy, pursuant to the exercise of its right to purchase all of the issued and outstanding common units in CVR Refining, purchased the remaining common units of CVR Refining not already owned by CVR Energy, including the purchase of CVR Refining common units owned directly by us. Prior to this, CVR Energy owned approximately 80.6% of the common units of CVR Refining and we directly owned approximately 3.9% of the common units of CVR Refining. As a result of exercising its purchase right, as of January 29, 2019, CVR Energy owns all of the common units of CVR Refining and we no longer have any direct ownership in CVR Refining. In addition, the common units of CVR Refining have subsequently ceased to be publicly traded or listed on the New York Stock Exchange any other national securities exchange. The remaining common units of CVR Refining acquired in this transaction were purchased for $241 million, excluding the amount paid by CVR Energy to us for the common units of CVR Refining directly owned by us.

We conduct our Automotive segment through our wholly-owned subsidiary, Icahn Automotive Group LLC ("Icahn Automotive"). Icahn Automotive is engaged in the retail and wholesale distribution of automotive parts in the aftermarket as well as providing automotive repair and maintenance services to its customers. Our Automotive segment also includes our investment in 767 Auto Leasing LLC ("767 Leasing"), a joint venture created to purchase vehicles for lease, as described further in Note 3, "Related Party Transactions."

We conduct our Food Packaging segment through our majority owned subsidiary, Viskase Companies, Inc. ("Viskase"). During January 2018, Viskase received $50 million in connection with its common stock rights offering. In connection with this rights offering, we fully exercised our subscription rights under our basic and over subscription privileges to purchase additional shares of Viskase common stock, thereby increasing our ownership of Viskase from 74.6% to 78.6%, for an aggregate additional investment of $44 million.

We conduct our Metals segment through our wholly-owned subsidiary, PSC Metals LLC (“PSC Metals”). PSC Metals is principally engaged in the business of collecting, processing and selling ferrous and non-ferrous metals, as well as the processing and distribution of steel pipe and plate products. PSC Metals collects industrial and obsolete scrap metal, processes it into reusable forms and supplies the recycled metals to its customers.

Our Real Estate operations consist primarily of rental real estate, property development and associated club activities. Our rental real estate operations consist primarily of office and industrial properties leased to single corporate tenants. Our property development operations are run primarily through a real estate investment, management and development subsidiary that focuses primarily on the construction and sale of single-family and multi-family homes, lots in subdivisions and planned communities, and raw land for residential development. Our property development locations also operate golf and club operations. In addition, our Real Estate operations also includes a hotel, timeshare and casino resort property in Aruba as well as a casino property in Atlantic City, New Jersey, which ceased operations in 2014 prior to our obtaining control of the property.

We conduct our Home Fashion segment through our wholly-owned subsidiary, WestPoint Home LLC (“WPH”). WPH's business consists of manufacturing, sourcing, marketing, distributing and selling home fashion consumer products.

We conduct our Mining segment through our majority owned subsidiary, Ferrous Resources Ltd. ("Ferrous Resources"). As of March 31, 2019, we owned approximately 77.2% of the total outstanding common stock of Ferrous Resources. Ferrous Resources acquired certain rights to iron ore mineral resources in Brazil and develops mining operations and related infrastructure to produce and sell iron ore products to the global steel industry.

On December 5, 2018, we announced a definitive agreement to sell Ferrous Resources for total consideration of $550 million. The transaction is expected to close in the second half of 2019. This transaction met all the criteria to be classified as held for sale on December 5, 2018 upon execution of the definitive agreement.

We conducted our Railcar segment through our wholly-owned subsidiary, American Railcar Leasing, LLC ("ARL"). ARL operated a leasing business consisting of purchased railcars leased to third parties under operating leases. During 2018, we sold all remaining railcars of ARL not previously sold and as a result, our business no longer includes an active Railcar segment. For the three months ended March 31, 2018, we had proceeds of $15 million in connection with the sale of railcars and we recorded a pretax gain on disposition of assets of $4 million.