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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