Related Party Transactions	12 Months Ended
Dec. 31, 2017
Related Party Transaction [Line Items]
Related Party Transactions	Related Party Transactions. Our second amended and restated agreement of limited partnership expressly permits us to enter into transactions with our general partner or any of its affiliates, including, without limitation, buying or selling properties from or to our general partner and any of its affiliates and borrowing and lending money from or to our general partner and any of its affiliates, subject to limitations contained in our partnership agreement and the Delaware Revised Uniform Limited Partnership Act. The indentures governing our indebtedness contain certain covenants applicable to transactions with affiliates. Investment Funds During the years ended December 31, 2017, 2016 and 2015, Mr. Icahn and his affiliates (excluding us) invested $600 million, $498 million and $240 million, respectively, in the Investment Funds, net of redemptions. As of December 31, 2017 and 2016, the total fair market value of investments in the Investment Funds made by Mr. Icahn and his affiliates (excluding us) was approximately $4.4 billion and $3.7 billion, respectively, representing approximately 59% and 69% of the Investment Funds' assets under management as of each respective date. We pay for expenses pertaining to the operation, administration and investment activities of our Investment segment for the benefit of the Investment Funds (including salaries, benefits and rent). Effective April 1, 2011, based on an expense-sharing arrangement, certain expenses borne by us are reimbursed by the Investment Funds. For the years ended December 31, 2017, 2016 and 2015, $13 million, $34 million and $235 million, respectively, was allocated to the Investment Funds based on this expense-sharing arrangement. Hertz Global Holdings, Inc. As discussed in Note 4, "Investments and Related Matters," the Investment Funds have an investment in the common stock of Hertz Global Holdings, Inc. ("Hertz") measured at fair value that would have otherwise been subject to the equity method of accounting beginning in the fourth quarter of 2016. Pep Boys provides services to Hertz in the ordinary course of business. For the years ended December 31, 2017 and 2016, revenue from Hertz was $17 million and $3 million, respectively. Additionally, Federal-Mogul had payments to Hertz in the ordinary course of business of $2 million and $2 million for the years ended December 31, 2017 and 2016, respectively. IRL Holding, LLC During the year ended December 31, 2015, ARL distributed an aggregate of $25 million to IRL Holding, LLC ("IRL"), an affiliate of Mr. Icahn, and also made a non-resident withholding of $2 million on IRL's behalf. American Railcar Leasing, LLC On February 29, 2016, Icahn Enterprises entered into a contribution agreement with an affiliate of Mr. Icahn to acquire the remaining 25% economic interest in ARL not already owned by us. Pursuant to this contribution agreement, we contributed 685,367 newly issued depositary units of Icahn Enterprises to such affiliate in exchange for the remaining 25% economic interest in ARL. As a result of the transaction, we owned a 100% economic interest in ARL. This transaction was authorized by the independent committee of the board of directors of the general partner of Icahn Enterprises. The independent committee was advised by independent counsel and retained an independent financial advisor which rendered a fairness opinion. ACF Industries, Inc. Our Railcar segment has certain transactions with ACF Industries LLC ("ACF"), an affiliate of Mr. Icahn, under various agreements, as well as on a purchase order basis. ACF is a manufacturer and fabricator of specialty railcar parts and miscellaneous steel products. Agreements and transactions with ACF include the following: •Railcar component purchases from ACF •Railcar parts purchases from and sales to ACF •Railcar purchasing and engineering services agreement with ACF •Lease of certain intellectual property to ACF •Railcar repair services and support for ACF •Railcar purchases from ACF (prior to June 1, 2017) Purchases from ACF were $6 million, $21 million and $86 million for the years ended December 31, 2017, 2016 and 2015, respectively. For the years ended December 31, 2017, 2016 and 2015, revenues from ACF were $1 million, $1 million and $10 million, respectively. Insight Portfolio Group LLC Insight Portfolio Group LLC ("Insight Portfolio Group") is an entity formed and controlled by Mr. Icahn in order to maximize the potential buying power of a group of entities with which Mr. Icahn has a relationship in negotiating with a wide range of suppliers of goods, services and tangible and intangible property at negotiated rates. Icahn Enterprises Holdings has a minority equity interest in Insight Portfolio Group and agreed to pay a portion of Insight Portfolio Group's operating expenses. In addition to the minority equity interest held by Icahn Enterprises Holdings, certain subsidiaries of ours, including Federal-Mogul, CVR Energy, PSC Metals, ARI, ARL (prior to June 1, 2017), Tropicana, Viskase and WPH also acquired minority equity interests in Insight Portfolio Group and agreed to pay a portion of Insight Portfolio Group's operating expenses. A number of other entities with which Mr. Icahn has a relationship also have minority equity interests in Insight Portfolio Group and also agreed to pay certain of Insight Portfolio Group's operating expenses. For the years ended December 31, 2017, 2016 and 2015, we and certain of our subsidiaries paid certain of the Insight Portfolio Group's operating expenses of $2 million, $2 million and $2 million, respectively.

Related Party Transactions.

Our second amended and restated agreement of limited partnership expressly permits us to enter into transactions with our general partner or any of its affiliates, including, without limitation, buying or selling properties from or to our general partner and any of its affiliates and borrowing and lending money from or to our general partner and any of its affiliates, subject to limitations contained in our partnership agreement and the Delaware Revised Uniform Limited Partnership Act. The indentures governing our indebtedness contain certain covenants applicable to transactions with affiliates.

Investment Funds

During the years ended December 31, 2017, 2016 and 2015, Mr. Icahn and his affiliates (excluding us) invested $600 million, $498 million and $240 million, respectively, in the Investment Funds, net of redemptions. As of December 31, 2017 and 2016, the total fair market value of investments in the Investment Funds made by Mr. Icahn and his affiliates (excluding us) was approximately $4.4 billion and $3.7 billion, respectively, representing approximately 59% and 69% of the Investment Funds' assets under management as of each respective date.

We pay for expenses pertaining to the operation, administration and investment activities of our Investment segment for the benefit of the Investment Funds (including salaries, benefits and rent). Effective April 1, 2011, based on an expense-sharing arrangement, certain expenses borne by us are reimbursed by the Investment Funds. For the years ended December 31, 2017, 2016 and 2015, $13 million, $34 million and $235 million, respectively, was allocated to the Investment Funds based on this expense-sharing arrangement.

Hertz Global Holdings, Inc.

As discussed in Note 4, "Investments and Related Matters," the Investment Funds have an investment in the common stock of Hertz Global Holdings, Inc. ("Hertz") measured at fair value that would have otherwise been subject to the equity method of accounting beginning in the fourth quarter of 2016. Pep Boys provides services to Hertz in the ordinary course of business. For the years ended December 31, 2017 and 2016, revenue from Hertz was $17 million and $3 million, respectively. Additionally, Federal-Mogul had payments to Hertz in the ordinary course of business of $2 million and $2 million for the years ended December 31, 2017 and 2016, respectively.

IRL Holding, LLC

During the year ended December 31, 2015, ARL distributed an aggregate of $25 million to IRL Holding, LLC ("IRL"), an affiliate of Mr. Icahn, and also made a non-resident withholding of $2 million on IRL's behalf.

American Railcar Leasing, LLC

On February 29, 2016, Icahn Enterprises entered into a contribution agreement with an affiliate of Mr. Icahn to acquire the remaining 25% economic interest in ARL not already owned by us. Pursuant to this contribution agreement, we contributed 685,367 newly issued depositary units of Icahn Enterprises to such affiliate in exchange for the remaining 25% economic interest in ARL. As a result of the transaction, we owned a 100% economic interest in ARL. This transaction was authorized by the independent committee of the board of directors of the general partner of Icahn Enterprises. The independent committee was advised by independent counsel and retained an independent financial advisor which rendered a fairness opinion.

ACF Industries, Inc.

Our Railcar segment has certain transactions with ACF Industries LLC ("ACF"), an affiliate of Mr. Icahn, under various agreements, as well as on a purchase order basis. ACF is a manufacturer and fabricator of specialty railcar parts and miscellaneous steel products. Agreements and transactions with ACF include the following:

•Railcar component purchases from ACF

•Railcar parts purchases from and sales to ACF

•Railcar purchasing and engineering services agreement with ACF

•Lease of certain intellectual property to ACF

•Railcar repair services and support for ACF

•Railcar purchases from ACF (prior to June 1, 2017)

Purchases from ACF were $6 million, $21 million and $86 million for the years ended December 31, 2017, 2016 and 2015, respectively. For the years ended December 31, 2017, 2016 and 2015, revenues from ACF were $1 million, $1 million and $10 million, respectively.

Insight Portfolio Group LLC

Insight Portfolio Group LLC ("Insight Portfolio Group") is an entity formed and controlled by Mr. Icahn in order to maximize the potential buying power of a group of entities with which Mr. Icahn has a relationship in negotiating with a wide range of suppliers of goods, services and tangible and intangible property at negotiated rates. Icahn Enterprises Holdings has a minority equity interest in Insight Portfolio Group and agreed to pay a portion of Insight Portfolio Group's operating expenses. In addition to the minority equity interest held by Icahn Enterprises Holdings, certain subsidiaries of ours, including Federal-Mogul, CVR Energy, PSC Metals, ARI, ARL (prior to June 1, 2017), Tropicana, Viskase and WPH also acquired minority equity interests in Insight Portfolio Group and agreed to pay a portion of Insight Portfolio Group's operating expenses. A number of other entities with which Mr. Icahn has a relationship also have minority equity interests in Insight Portfolio Group and also agreed to pay certain of Insight Portfolio Group's operating expenses. For the years ended December 31, 2017, 2016 and 2015, we and certain of our subsidiaries paid certain of the Insight Portfolio Group's operating expenses of $2 million, $2 million and $2 million, respectively.