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Debt Narrative - Other (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Oct. 15, 2012
Debt Instrument [Line Items]    
2015 400us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
2016 493us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017 1,293us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018 823us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
2019 1,593us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Thereafter 6,959us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Future maturiites due on debt 11,561iep_FutureMaturiitesDueOnDebt  
2015 2us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent  
2016 3us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears  
2017 2us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears  
2018 2us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears  
2019 2us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears  
Thereafter 41us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter  
Capital Leases, Future Minimum Payments Due 52us-gaap_CapitalLeasesFutureMinimumPaymentsDue  
Revolving Credit Facility [Member] | Home Fashion Segment [Member]    
Debt Instrument [Line Items]    
Senior credit facility   10us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_HomeFashionSegmentMember
Line of credit annual fee on borrowed amount 0.50%iep_Lineofcreditannualfeeonborrowedamount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_HomeFashionSegmentMember
 
Line of credit facility, outstanding borowings   $ 6us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_HomeFashionSegmentMember