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Operating Units Investment Segment (Details) - USD ($) $ in Billions | Sep. 30, 2015 | Dec. 31, 2014
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Investment Funds [Member] |  |
Segment Reporting Information [Line Items] |  |
Fair value of our interest in Funds of subsidiary | $ 4.2 | $ 4.3

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- Definition The fair value of investment held in the subsidiary investment funds by the limited liability company or limited partnership. + References No definition available. + Details
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Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=iep_InvestmentFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |