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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 $ 12,000,000us-gaap_RestructuringCharges $ 8,000,000us-gaap_RestructuringCharges          
Automotive Segment [Member]              
Segment Reporting Information [Line Items]              
Proceeds from subsidiary rights offering     250,000,000iep_ProceedsFromRightsOffering
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Payments to subsidiary to acquire additional interest in subsidiary, rights offering 230,000,000us-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 326,000,000us-gaap_InterestsContinuedToBeHeldByTransferorFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
          306,000,000us-gaap_InterestsContinuedToBeHeldByTransferorFairValue
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
Gross amount of transferred receivables under factoring arrangements qualifying as sales 308,000,000iep_GrossAccountsReceivableFactoredQualifyingAsSales
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
          293,000,000iep_GrossAccountsReceivableFactoredQualifyingAsSales
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
Undrawn cash with respect to transferred receivables 2,000,000iep_Undrawncashwithrespecttotransferredreceivables
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
          2,000,000iep_Undrawncashwithrespecttotransferredreceivables
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
Proceeds from transferred receivables under factoring arrangements qualifying as sales 390,000,000us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromNewTransfers
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
410,000,000us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromNewTransfers
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
         
Expenses associated with transferred receivables under factoring arrangements 2,000,000us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
2,000,000us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
         
Maximum exposure associated with transferred receivables under factoring arrangements 19,000,000us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
          17,000,000us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
Restructuring 12,000,000us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
8,000,000us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
         
Future additional restructuring costs expected 11,000,000us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
           
Restructuring 2013 [Member] | Automotive Segment [Member]              
Segment Reporting Information [Line Items]              
Restructuring 10,000,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= iep_Restructuring2013MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
    4,000,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= iep_Restructuring2013MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
     
Expected total costs for restructuring program 142,000,000us-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         313,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= iep_TRWMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Consideration payable upon conditions met with respect to business combination         6,000,000us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= iep_TRWMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Business combinations, recognized identifiable assets, net tangible assets         199,000,000iep_Businesscombinationsrecognizedidentifiableassetsnettangibleassets
/ us-gaap_BusinessAcquisitionAxis
= iep_TRWMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Business combination, goodwill allocation         51,000,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= iep_TRWMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Business combinations, recognized identifiable assets, net intangible assets         69,000,000iep_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           340,000,000iep_Businesscombinationcommitmenttopurchase
/ us-gaap_BusinessAcquisitionAxis
= iep_UniSelectMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
 
Number of Distribution Centers           39iep_NumberOfDistributionCenters
/ us-gaap_BusinessAcquisitionAxis
= iep_UniSelectMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
 
Number of Stores           240us-gaap_NumberOfStores
/ us-gaap_BusinessAcquisitionAxis
= iep_UniSelectMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
 
Number of independent wholesalers in network           2,000iep_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 133,000,000us-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 $ 9,000,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
/ us-gaap_RestructuringPlanAxis
= iep_Restructuring2013MemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember