Description of Business	3 Months Ended
Mar. 31, 2018
Description of Business [Abstract]
Description of Business	Description of Business. Overview Icahn Enterprises L.P. ("Icahn Enterprises") owns a 99% limited partner interest in Icahn Enterprises Holdings L.P. ("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, 2018. Icahn Enterprises Holdings and its subsidiaries own substantially all of the assets and liabilities of Icahn Enterprises and conduct substantially all of its operations. Therefore, the financial results of Icahn Enterprises and Icahn Enterprises Holdings are substantially the same, with differences relating primarily to allocations of the general partner interest, which is reflected as an aggregate 1.99% general partner interest in the financial statements of Icahn Enterprises, as well as due to the carrying amount of deferred financing costs related to our senior unsecured notes. In addition to the above, Mr. Icahn and his affiliates owned approximately 91.0% of Icahn Enterprises' outstanding depositary units as of March 31, 2018. References to "we," "our" or "us" herein include both Icahn Enterprises and Icahn Enterprises Holdings and their subsidiaries, unless the context otherwise requires. Description of Operating Businesses We are a diversified holding company owning subsidiaries currently engaged in the following continuing operating businesses: Investment, Automotive, Energy, Railcar, Gaming, Metals, Mining, Food Packaging, Real Estate and Home Fashion. 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. 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. We and certain of Mr. Icahn's wholly owned affiliates are the only investors in the Investment Funds. 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. Interests in the Investment Funds are not offered to outside investors. We had interests in the Investment Funds with a fair value of approximately $3.2 billion and $3.0 billion as of March 31, 2018 and December 31, 2017, respectively. Automotive We conduct our Automotive segment through our wholly owned subsidiaries Federal-Mogul LLC ("Federal-Mogul") and Icahn Automotive Group LLC ("Icahn Automotive"). During January 2017, we increased our ownership in Federal-Mogul from 82.0% to 100% for an aggregate purchase price of $305 million. In April 2018, we announced a definitive agreement to sell Federal-Mogul. Refer to Note 18, "Subsequent Events," for further discussion. Federal-Mogul is engaged in the manufacture and distribution of automotive parts. Icahn Automotive is engaged in the distribution of automotive parts in the aftermarket as well as providing automotive services to its customers. Energy We conduct our Energy segment through our majority ownership in CVR Energy, Inc. ("CVR Energy"). CVR Energy is a diversified holding company primarily engaged in the petroleum refining and nitrogen fertilizer manufacturing industries through its holdings in CVR Refining L.P. ("CVR Refining") and CVR Partners L.P. ("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, 2018, CVR Energy owned 100% of each of the general partners of CVR Refining and CVR Partners and approximately 66% and 34% of the common units of CVR Refining and CVR Partners, respectively. As of March 31, 2018, we owned approximately 82.0% of the total outstanding common stock of CVR Energy. In addition, as of March 31, 2018, we directly owned approximately 3.9% of the total outstanding common units of CVR Refining. Railcar We conduct our Railcar segment through our majority ownership in American Railcar Industries, Inc. ("ARI") and, prior to its sale on June 1, 2017, our wholly owned subsidiary American Railcar Leasing, LLC ("ARL"). As of March 31, 2018, we owned approximately 62.2% of the total outstanding common stock of ARI. ARI is a North American designer and manufacturer of hopper and tank railcars. ARI provides its railcar customers with integrated solutions through a comprehensive set of high-quality products and related services through its manufacturing, leasing and railcar services operations. ARI's manufacturing consists of railcar manufacturing and railcar and industrial component manufacturing. ARI's railcar leasing business consists of railcars built by ARI leased to third parties under operating leases. ARI's railcar services consist of railcar repair, engineering and field services. Gaming We conduct our Gaming segment through our majority ownership in Tropicana Entertainment Inc. ("Tropicana") and our wholly owned subsidiary Trump Entertainment Resorts Inc. ("TER"). As of March 31, 2018, we owned approximately 83.9% of the total outstanding common stock of Tropicana. In April 2018, we announced a definitive agreement to sell Tropicana. Refer to Note 18, "Subsequent Events," for further discussion. Tropicana is an owner and operator of regional casino and entertainment properties located in the United States and one hotel, timeshare and casino resort located on the island of Aruba. TER owned the Trump Taj Mahal Casino Resort, which closed in October 2016, and was subsequently sold on March 31, 2017. TER also owns Trump Plaza Hotel and Casino, which ceased operations in September 2014, prior to our obtaining a controlling interest in TER. Metals We conduct our Metals segment through our indirect wholly owned subsidiary PSC Metals, Inc. (“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. Mining We conduct our Mining segment through our majority ownership in Ferrous Resources Ltd. ("Ferrous Resources"). As of March 31, 2018, 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. Food Packaging We conduct our Food Packaging segment through our majority ownership in 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. Real Estate Our Real Estate operations consist 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. Home Fashion We conduct our Home Fashion segment through our indirect wholly owned subsidiary, WestPoint Home LLC (“WPH”). WPH's business consists of manufacturing, sourcing, marketing, distributing and selling home fashion consumer products.

Description of Business.

Overview

Icahn Enterprises L.P. ("Icahn Enterprises") owns a 99% limited partner interest in Icahn Enterprises Holdings L.P. ("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, 2018. Icahn Enterprises Holdings and its subsidiaries own substantially all of the assets and liabilities of Icahn Enterprises and conduct substantially all of its operations. Therefore, the financial results of Icahn Enterprises and Icahn Enterprises Holdings are substantially the same, with differences relating primarily to allocations of the general partner interest, which is reflected as an aggregate 1.99% general partner interest in the financial statements of Icahn Enterprises, as well as due to the carrying amount of deferred financing costs related to our senior unsecured notes. In addition to the above, Mr. Icahn and his affiliates owned approximately 91.0% of Icahn Enterprises' outstanding depositary units as of March 31, 2018.

References to "we," "our" or "us" herein include both Icahn Enterprises and Icahn Enterprises Holdings and their subsidiaries, unless the context otherwise requires.

Description of Operating Businesses

We are a diversified holding company owning subsidiaries currently engaged in the following continuing operating businesses: Investment, Automotive, Energy, Railcar, Gaming, Metals, Mining, Food Packaging, Real Estate and Home Fashion. 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. 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. We and certain of Mr. Icahn's wholly owned affiliates are the only investors in the Investment Funds. 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. Interests in the Investment Funds are not offered to outside investors. We had interests in the Investment Funds with a fair value of approximately $3.2 billion and $3.0 billion as of March 31, 2018 and December 31, 2017, respectively.

Automotive

We conduct our Automotive segment through our wholly owned subsidiaries Federal-Mogul LLC ("Federal-Mogul") and Icahn Automotive Group LLC ("Icahn Automotive"). During January 2017, we increased our ownership in Federal-Mogul from 82.0% to 100% for an aggregate purchase price of $305 million. In April 2018, we announced a definitive agreement to sell Federal-Mogul. Refer to Note 18, "Subsequent Events," for further discussion.

Federal-Mogul is engaged in the manufacture and distribution of automotive parts. Icahn Automotive is engaged in the distribution of automotive parts in the aftermarket as well as providing automotive services to its customers.

Energy

We conduct our Energy segment through our majority ownership in CVR Energy, Inc. ("CVR Energy"). CVR Energy is a diversified holding company primarily engaged in the petroleum refining and nitrogen fertilizer manufacturing industries through its holdings in CVR Refining L.P. ("CVR Refining") and CVR Partners L.P. ("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, 2018, CVR Energy owned 100% of each of the general partners of CVR Refining and CVR Partners and approximately 66% and 34% of the common units of CVR Refining and CVR Partners, respectively.

As of March 31, 2018, we owned approximately 82.0% of the total outstanding common stock of CVR Energy. In addition, as of March 31, 2018, we directly owned approximately 3.9% of the total outstanding common units of CVR Refining.

Railcar

We conduct our Railcar segment through our majority ownership in American Railcar Industries, Inc. ("ARI") and, prior to its sale on June 1, 2017, our wholly owned subsidiary American Railcar Leasing, LLC ("ARL"). As of March 31, 2018, we owned approximately 62.2% of the total outstanding common stock of ARI.

ARI is a North American designer and manufacturer of hopper and tank railcars. ARI provides its railcar customers with integrated solutions through a comprehensive set of high-quality products and related services through its manufacturing, leasing and railcar services operations. ARI's manufacturing consists of railcar manufacturing and railcar and industrial component manufacturing. ARI's railcar leasing business consists of railcars built by ARI leased to third parties under operating leases. ARI's railcar services consist of railcar repair, engineering and field services.

Gaming

We conduct our Gaming segment through our majority ownership in Tropicana Entertainment Inc. ("Tropicana") and our wholly owned subsidiary Trump Entertainment Resorts Inc. ("TER"). As of March 31, 2018, we owned approximately 83.9% of the total outstanding common stock of Tropicana. In April 2018, we announced a definitive agreement to sell Tropicana. Refer to Note 18, "Subsequent Events," for further discussion.

Tropicana is an owner and operator of regional casino and entertainment properties located in the United States and one hotel, timeshare and casino resort located on the island of Aruba. TER owned the Trump Taj Mahal Casino Resort, which closed in October 2016, and was subsequently sold on March 31, 2017. TER also owns Trump Plaza Hotel and Casino, which ceased operations in September 2014, prior to our obtaining a controlling interest in TER.

Metals

We conduct our Metals segment through our indirect wholly owned subsidiary PSC Metals, Inc. (“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.

Mining

We conduct our Mining segment through our majority ownership in Ferrous Resources Ltd. ("Ferrous Resources"). As of March 31, 2018, 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.

Food Packaging

We conduct our Food Packaging segment through our majority ownership in 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.

Real Estate

Our Real Estate operations consist 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.

Home Fashion

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