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Commitments and Contingencies Commitments and Contingencies (Details) (USD $)
1 Months Ended 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Dec. 31, 2014
Dec. 31, 2011
Dec. 31, 2013
Loss Contingencies [Line Items]          
2015     $ 75,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016     69,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017     55,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018     41,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019     34,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Thereafter     129,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Total future minimum lease payments under operating leases     403,000,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Automotive Segment [Member]          
Loss Contingencies [Line Items]          
Accrual for Environmental Loss Contingencies     15,000,000us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
  14,000,000us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
Gaming Segment [Member]          
Loss Contingencies [Line Items]          
Tax refund as result of Trop AC tax appeal settlement 32,000,000iep_TaxrefundasresultofTropACtaxappealsettlement
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
50,000,000iep_TaxrefundasresultofTropACtaxappealsettlement
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
     
Tax to be paid as result of Trop AC tax appeal settlement     2,000,000iep_TaxtobepaidasresultofTropACtaxappealsettlement
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
   
Real estate tax credits used     16,000,000iep_Realestatetaxcreditsused
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
   
Professional Fees     4,000,000us-gaap_ProfessionalFees
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
   
PSC Metals [Member] | Metals Segment [Member]          
Loss Contingencies [Line Items]          
Accrual for Environmental Loss Contingencies     28,000,000us-gaap_AccrualForEnvironmentalLossContingencies
/ dei_LegalEntityAxis
= iep_PscMetalsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_MetalsSegmentMember
  29,000,000us-gaap_AccrualForEnvironmentalLossContingencies
/ dei_LegalEntityAxis
= iep_PscMetalsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_MetalsSegmentMember
WPH [Member] | Home Fashion Segment [Member]          
Loss Contingencies [Line Items]          
Accrual for Environmental Loss Contingencies     1,000,000us-gaap_AccrualForEnvironmentalLossContingencies
/ dei_LegalEntityAxis
= iep_WphMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_HomeFashionSegmentMember
  1,000,000us-gaap_AccrualForEnvironmentalLossContingencies
/ dei_LegalEntityAxis
= iep_WphMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_HomeFashionSegmentMember
Federal-Mogul [Member] | Automotive Segment [Member]          
Loss Contingencies [Line Items]          
Site Contingency, Loss Exposure in Excess of Accrual, Best Estimate     40,000,000us-gaap_SiteContingencyLossExposureInExcessOfAccrualBestEstimate
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Asset Retirement Obligation     24,000,000us-gaap_AssetRetirementObligation
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
  26,000,000us-gaap_AssetRetirementObligation
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
ARI [Member] | Railcar Segment [Member]          
Loss Contingencies [Line Items]          
Litigation claim gain amount     25,000,000iep_Litigationclaimgainamount
/ dei_LegalEntityAxis
= iep_AriMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_RailcarSegmentMember
   
Litigation counterclaim amount     10,000,000iep_Litigationcounterclaimamount
/ dei_LegalEntityAxis
= iep_AriMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_RailcarSegmentMember
   
Tropicana [Member] | Gaming Segment [Member]          
Loss Contingencies [Line Items]          
Litigation Settlement, Amount     600,000us-gaap_LitigationSettlementAmount
/ dei_LegalEntityAxis
= iep_TropicanaMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
   
Adjustment to tax claim receivable and accrual     8,000,000iep_Adjustmenttotaxclaimreceivableandaccrual
/ dei_LegalEntityAxis
= iep_TropicanaMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
   
Cleveland OH Scrap Processing Facility [Member] | PSC Metals [Member] | Metals Segment [Member]          
Loss Contingencies [Line Items]          
Number of Scrap Processing Facilities Requiring Refrigerant Extraction Services     11iep_NumberOfScrapProcessingFacilitiesRequiringRefrigerantExtractionServices
/ us-gaap_EnvironmentalRemediationSiteAxis
= iep_ClevelandOhScrapProcessingFacilityMember
/ dei_LegalEntityAxis
= iep_PscMetalsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_MetalsSegmentMember
   
Environmental Compliance Costs, Anticipated Cost, Low Estimate     800,000iep_EnvironmentalComplianceCostsAnticipatedCostLowEstimate
/ us-gaap_EnvironmentalRemediationSiteAxis
= iep_ClevelandOhScrapProcessingFacilityMember
/ dei_LegalEntityAxis
= iep_PscMetalsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_MetalsSegmentMember
   
Environmental Compliance Costs, Anticipated Cost, High Estimate     1,700,000iep_EnvironmentalComplianceCostsAnticipatedCostHighEstimate
/ us-gaap_EnvironmentalRemediationSiteAxis
= iep_ClevelandOhScrapProcessingFacilityMember
/ dei_LegalEntityAxis
= iep_PscMetalsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_MetalsSegmentMember
   
Loss Contingency, Damages Paid, Value       199,000us-gaap_LossContingencyDamagesPaidValue
/ us-gaap_EnvironmentalRemediationSiteAxis
= iep_ClevelandOhScrapProcessingFacilityMember
/ dei_LegalEntityAxis
= iep_PscMetalsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_MetalsSegmentMember
 
Principal Owners and Affiliates [Member]          
Loss Contingencies [Line Items]          
Affiliate ownership interest     88.40%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
/ iep_MembersOrPartnersAxis
= iep_PrincipalOwnersAndAffiliatesMember
   
Principal Owners and Affiliates [Member] | Icahn Enterprises G.P. [Member]          
Loss Contingencies [Line Items]          
Affiliate ownership in parent company general partner         100.00%iep_AffiliateOwnershipInParentCompanyGeneralPartner
/ dei_LegalEntityAxis
= iep_IcahnEnterprisesGPMember
/ iep_MembersOrPartnersAxis
= iep_PrincipalOwnersAndAffiliatesMember
ACF [Member]          
Loss Contingencies [Line Items]          
Funded status of the plan     (474,000,000)us-gaap_DefinedBenefitPlanFundedStatusOfPlan
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= iep_AcfMember
  (592,000,000)us-gaap_DefinedBenefitPlanFundedStatusOfPlan
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= iep_AcfMember
Starfire Holding Corporation [Member]          
Loss Contingencies [Line Items]          
Ownership Percentage by Principal Owner     99.40%iep_OwnershipPercentageByPrincipalOwner
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= iep_StarfireHoldingCorporationMember
   
Subsidiary Indemnity Agreement, Pension Funding Contingencies As A Result of Being In The Controlled Group, Distribution Limitation, Net Worth Floor     $ 250,000,000iep_SubsidiaryIndemnityAgreementPensionFundingContingenciesAsResultOfBeingInControlledGroupDistributionLimitationNetWorthFloor
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= iep_StarfireHoldingCorporationMember