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v2.4.1.9

Commitments and Contingencies Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2015 | Oct. 25, 2014 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2008
Mr. Icahn and his affiliates [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Affiliate ownership interest | 88.40%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest / iep_MembersOrPartnersAxis = iep_PrincipalOwnersAndAffiliatesMember |  |  |  |
ACF [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Defined benefit plan underfunded amount | 493 us-gaap_DefinedBenefitPlanFundedStatusOfPlan / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |  | $ 474 us-gaap_DefinedBenefitPlanFundedStatusOfPlan / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |
Starfire Holding Corporation [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Ownership percentage by Mr. Icahn | 99.40%iep_OwnershipPercentageByPrincipalOwner / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_StarfireHoldingCorporationMember |  |  |  |
Net worth floor for which distributions to stockholders would be limited while contingent liabilities exist that can be imposed on us | 250 iep_SubsidiaryIndemnityAgreementPensionFundingContingenciesAsResultOfBeingInControlledGroupDistributionLimitationNetWorthFloor / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_StarfireHoldingCorporationMember |  |  |  |
Metals Segment [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental liabilities | 27 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_StatementBusinessSegmentsAxis = iep_MetalsSegmentMember |  |  | 28 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_StatementBusinessSegmentsAxis = iep_MetalsSegmentMember |
Railcar Segment [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation claim gain amount |  | 25 iep_Litigationclaimgainamount / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |
Litigation counterclaim amount |  | 10 iep_Litigationcounterclaimamount / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |
Automotive Segment [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental liabilities | 15 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  | 15 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Possible material additional losses, above and beyond best estimate of required remediation costs | 35 us-gaap_SiteContingencyLossExposureInExcessOfAccrualBestEstimate / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |
Asset retirement obligation | 19 us-gaap_AssetRetirementObligation / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  | 24 us-gaap_AssetRetirementObligation / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Home Fashion Segment [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental liabilities | 1 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_StatementBusinessSegmentsAxis = iep_HomeFashionSegmentMember |  |  | 1 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_StatementBusinessSegmentsAxis = iep_HomeFashionSegmentMember |
Energy Segment [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Rent expense on operating leases | 2 us-gaap_LeaseAndRentalExpense / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  | 2 us-gaap_LeaseAndRentalExpense / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |
Litigation settlement amount | 30 us-gaap_LitigationSettlementAmount / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  | 27 us-gaap_LitigationSettlementAmount / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |
Litigation settlement interest | 3 us-gaap_LitigationSettlementInterest / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |
Litigation receivable | 4 iep_Litigationreceivable / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |
Accrued environmental liabilities | 1 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  | 1 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |
Environmental remediation expense | 11 us-gaap_EnvironmentalRemediationExpense / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  | 34 us-gaap_EnvironmentalRemediationExpense / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |
Cost of RINs | 37 iep_CostofRINs / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  | 35 iep_CostofRINs / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |
Biofuel blending obligation | 57 iep_Biofuelblendingobligation / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  | 52 iep_Biofuelblendingobligation / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |
Icahn Enterprises G.P. [Member] | Mr. Icahn and his affiliates [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Affiliate ownership in parent company general partner | 100.00%iep_AffiliateOwnershipInParentCompanyGeneralPartner / dei_LegalEntityAxis = iep_IcahnEnterprisesGPMember / iep_MembersOrPartnersAxis = iep_PrincipalOwnersAndAffiliatesMember |  |  |  |
CRNF [Member] | Energy Segment [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Average increase in annual property tax expense |  |  |  |  | $ 11 iep_AverageIncreaseInAnnualPropertyTaxExpense / dei_LegalEntityAxis = iep_CrnfMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember

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