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Operating Units Investment Segment (Details) (USD $) | 3 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2011 | Jul. 02, 2012 Investment Funds [Member] | Dec. 31, 2012 Investment Funds [Member] | Dec. 31, 2011 Investment Funds [Member]
Segment Reporting Information [Line Items] |  |  |  |
Special Profits Interest Allocation | $ 9,000,000 |  |  |
Incentive Allocation | 7,000,000 |  |  |
Investment in funds |  | 300,000,000 |  |
Fair value of our intrest in Funds of subsidiary |  |  | $ 2,400,000,000 | $ 3,100,000,000

X
- Definition Incentive Allocation to General Partners of Investment Funds + References No definition available. + Details
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Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Investment in funds + References No definition available. + Details
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Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Special Profits Interest Allocation to General Partners of Investment Funds + References No definition available. + Details
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Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- 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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- Details
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Namespace Prefix: | us-gaap_
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