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v2.4.1.9

Operating Units Automotive Segment (Details) (USD $) | 3 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 26, 2015 | Mar. 31, 2013 | Feb. 06, 2015 | Feb. 09, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Restructuring | $ 12,000,000 us-gaap_RestructuringCharges | $ 8,000,000 us-gaap_RestructuringCharges |  |  |  |  |
Automotive Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Proceeds from subsidiary rights offering |  |  | 250,000,000 iep_ProceedsFromRightsOffering / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |
Payments to subsidiary to acquire additional interest in subsidiary, rights offering | 230,000,000 us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |  |
Percentage of equity ownership in subsidiary | 82.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |  |
Gross amount of transferred receivables under factoring arrangement | 326,000,000 us-gaap_InterestsContinuedToBeHeldByTransferorFairValue / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |  | 306,000,000 us-gaap_InterestsContinuedToBeHeldByTransferorFairValue / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Gross amount of transferred receivables under factoring arrangements qualifying as sales | 308,000,000 iep_GrossAccountsReceivableFactoredQualifyingAsSales / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |  | 293,000,000 iep_GrossAccountsReceivableFactoredQualifyingAsSales / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Undrawn cash with respect to transferred receivables | 2,000,000 iep_Undrawncashwithrespecttotransferredreceivables / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |  | 2,000,000 iep_Undrawncashwithrespecttotransferredreceivables / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Proceeds from transferred receivables under factoring arrangements qualifying as sales | 390,000,000 us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromNewTransfers / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 410,000,000 us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromNewTransfers / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |
Expenses associated with transferred receivables under factoring arrangements | 2,000,000 us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 2,000,000 us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |
Maximum exposure associated with transferred receivables under factoring arrangements | 19,000,000 us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |  | 17,000,000 us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Restructuring | 12,000,000 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 8,000,000 us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |
Future additional restructuring costs expected | 11,000,000 us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1 / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |  |
Restructuring 2013 [Member] | Automotive Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Restructuring | 10,000,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = iep_Restructuring2013MemberMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  | 4,000,000 us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = iep_Restructuring2013MemberMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |
Expected total costs for restructuring program | 142,000,000 us-gaap_RestructuringAndRelatedCostExpectedCost1 / us-gaap_RestructuringPlanAxis = iep_Restructuring2013MemberMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |  |
TRW [Member] | Automotive Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Gross payments to acquire business |  |  |  |  | 313,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = iep_TRWMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |
Consideration payable upon conditions met with respect to business combination |  |  |  |  | 6,000,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = iep_TRWMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |
Business combinations, recognized identifiable assets, net tangible assets |  |  |  |  | 199,000,000 iep_Businesscombinationsrecognizedidentifiableassetsnettangibleassets / us-gaap_BusinessAcquisitionAxis = iep_TRWMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |
Business combination, goodwill allocation |  |  |  |  | 51,000,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = iep_TRWMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |
Business combinations, recognized identifiable assets, net intangible assets |  |  |  |  | 69,000,000 iep_Businesscombinationsrecognizedidentifiableassetsnetintangibleassets / us-gaap_BusinessAcquisitionAxis = iep_TRWMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |
Uni-Select [Member] | Automotive Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Business combination, commitment to purchase |  |  |  |  |  | 340,000,000 iep_Businesscombinationcommitmenttopurchase / us-gaap_BusinessAcquisitionAxis = iep_UniSelectMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Number of Distribution Centers |  |  |  |  |  | 39 iep_NumberOfDistributionCenters / us-gaap_BusinessAcquisitionAxis = iep_UniSelectMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Number of Stores |  |  |  |  |  | 240 us-gaap_NumberOfStores / us-gaap_BusinessAcquisitionAxis = iep_UniSelectMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Number of independent wholesalers in network |  |  |  |  |  | 2,000 iep_Numberofindependentwholesalersinnetwork / us-gaap_BusinessAcquisitionAxis = iep_UniSelectMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Employee severance [Member] | Restructuring 2013 [Member] | Automotive Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Expected total costs for restructuring program | 133,000,000 us-gaap_RestructuringAndRelatedCostExpectedCost1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = iep_Restructuring2013MemberMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |  |
Facility closing [Member] | Restructuring 2013 [Member] | Automotive Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Expected total costs for restructuring program | $ 9,000,000 us-gaap_RestructuringAndRelatedCostExpectedCost1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_FacilityClosingMember / us-gaap_RestructuringPlanAxis = iep_Restructuring2013MemberMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |  |

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