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Operating Units Investment Segment (Details) (Investment Funds [Member], USD $) In Billions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Fair value of our interest in Funds of subsidiary | $ 2.6 | $ 2.4
Principal Owners and Affiliates [Member] |  |
Segment Reporting Information [Line Items] |  |
Related party investment in Funds | $ 3.9 | $ 3.5

X
- Definition Related party investment in Funds + References No definition available. + Details
Name: | iep_RelatedPartyInvestmentInFunds
Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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
Name: | iep_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterestFairValue
Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration