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Operating Units Automotive Segment (Details) (USD $)
12 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2013
Jan. 31, 2014
Segment Reporting Information [Line Items]          
Restructuring $ 84,000,000us-gaap_RestructuringCharges $ 50,000,000us-gaap_RestructuringCharges $ 31,000,000us-gaap_RestructuringCharges    
Goodwill, Period Increase (Decrease) 32,000,000us-gaap_GoodwillAcquiredDuringPeriod        
Automotive Segment [Member]          
Segment Reporting Information [Line Items]          
Restructuring 86,000,000us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
40,000,000us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
26,000,000us-gaap_RestructuringCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Goodwill, Period Increase (Decrease) 32,000,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Federal-Mogul [Member]          
Segment Reporting Information [Line Items]          
Percentage of equity ownership in subsidiary 80.70%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
/ dei_LegalEntityAxis
= iep_FederalMogulMember
       
Gross amount of transferred receivables under factoring arrangement 306,000,000us-gaap_InterestsContinuedToBeHeldByTransferorFairValue
/ dei_LegalEntityAxis
= iep_FederalMogulMember
271,000,000us-gaap_InterestsContinuedToBeHeldByTransferorFairValue
/ dei_LegalEntityAxis
= iep_FederalMogulMember
     
Gross amount of transferred receivables under factoring arrangements qualifying as sales 293,000,000iep_GrossAccountsReceivableFactoredQualifyingAsSales
/ dei_LegalEntityAxis
= iep_FederalMogulMember
258,000,000iep_GrossAccountsReceivableFactoredQualifyingAsSales
/ dei_LegalEntityAxis
= iep_FederalMogulMember
     
Proceeds from transferred receivables under factoring arrangements qualifying as sales 1,700,000,000us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromNewTransfers
/ dei_LegalEntityAxis
= iep_FederalMogulMember
1,500,000,000us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromNewTransfers
/ dei_LegalEntityAxis
= iep_FederalMogulMember
1,500,000,000us-gaap_CashFlowsBetweenTransfereeAndTransferorProceedsFromNewTransfers
/ dei_LegalEntityAxis
= iep_FederalMogulMember
   
Expenses associated with transferred receivables under factoring arrangements 6,000,000us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale
/ dei_LegalEntityAxis
= iep_FederalMogulMember
7,000,000us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale
/ dei_LegalEntityAxis
= iep_FederalMogulMember
7,000,000us-gaap_SecuritizationFinancialAssetForWhichTransferIsAccountedAsSaleGainLossOnSale
/ dei_LegalEntityAxis
= iep_FederalMogulMember
   
Maximum exposure associated with transferred receivables under factoring arrangements 17,000,000us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ dei_LegalEntityAxis
= iep_FederalMogulMember
21,000,000us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ dei_LegalEntityAxis
= iep_FederalMogulMember
     
Restructuring 86,000,000us-gaap_RestructuringCharges
/ dei_LegalEntityAxis
= iep_FederalMogulMember
40,000,000us-gaap_RestructuringCharges
/ dei_LegalEntityAxis
= iep_FederalMogulMember
26,000,000us-gaap_RestructuringCharges
/ dei_LegalEntityAxis
= iep_FederalMogulMember
   
Restructuring and Related Cost, Expected Cost Remaining 13,000,000us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
/ dei_LegalEntityAxis
= iep_FederalMogulMember
       
Proceeds from rights offering       500,000,000iep_ProceedsFromRightsOffering
/ dei_LegalEntityAxis
= iep_FederalMogulMember
 
Restructuring 2013 [Member] [Member] | Federal-Mogul [Member]          
Segment Reporting Information [Line Items]          
Restructuring 82,000,000us-gaap_RestructuringCharges
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_RestructuringPlanAxis
= iep_Restructuring2013MemberMember
39,000,000us-gaap_RestructuringCharges
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_RestructuringPlanAxis
= iep_Restructuring2013MemberMember
     
Restructuring, expected cost 134,000,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_RestructuringPlanAxis
= iep_Restructuring2013MemberMember
       
Honeywell [Member] | Automotive Segment [Member]          
Segment Reporting Information [Line Items]          
Payments to Acquire Businesses, Gross         169,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= iep_HoneywellMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred         15,000,000us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred
/ us-gaap_BusinessAcquisitionAxis
= iep_HoneywellMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
Business Combination, Assets and Liabilities Arising from Contingencies, Amount Recognized, Net 184,000,000us-gaap_BusinessCombinationAssetsAndLiabilitiesArisingFromContingenciesAmountRecognized
/ us-gaap_BusinessAcquisitionAxis
= iep_HoneywellMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Business Combination, Acquisition Related Costs 7,000,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= iep_HoneywellMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Affinia [Member] | Automotive Segment [Member]          
Segment Reporting Information [Line Items]          
Payments to Acquire Businesses, Gross         149,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= iep_AffiniaMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
business combinations, recognized identifiable assets, net tangible assets 71,000,000iep_Businesscombinationsrecognizedidentifiableassetsnettangibleassets
/ us-gaap_BusinessAcquisitionAxis
= iep_AffiniaMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Goodwill, Period Increase (Decrease) 26,000,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= iep_AffiniaMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
business combinations, recognized identifiable assets, net intangible assets 51,000,000iep_Businesscombinationsrecognizedidentifiableassetsnetintangibleassets
/ us-gaap_BusinessAcquisitionAxis
= iep_AffiniaMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Employee Severance [Member] | Restructuring 2013 [Member] [Member] | Federal-Mogul [Member]          
Segment Reporting Information [Line Items]          
Restructuring, expected cost 127,000,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_RestructuringPlanAxis
= iep_Restructuring2013MemberMember
       
Facility Closing [Member] | Restructuring 2013 [Member] [Member] | Federal-Mogul [Member]          
Segment Reporting Information [Line Items]          
Restructuring, expected cost $ 7,000,000us-gaap_RestructuringAndRelatedCostExpectedCost1
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
/ us-gaap_RestructuringPlanAxis
= iep_Restructuring2013MemberMember