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Pensions, Other Post-employment Benefits and Employee Benefit Plans Narrative (Details) (Automotive Segment [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year $ 108us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear    
Defined Benefit Plan, Accumulated Benefit Obligation 1,809us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation 1,598us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation  
Defined Contribution Plan, Cost Recognized 45us-gaap_DefinedContributionPlanCostRecognized 42us-gaap_DefinedContributionPlanCostRecognized 23us-gaap_DefinedContributionPlanCostRecognized
Supplemental Unemployment Benefits, Other Postemployment 25us-gaap_SupplementalUnemploymentBenefitsOtherPostemployment 29us-gaap_SupplementalUnemploymentBenefitsOtherPostemployment  
United States Plans
     
Defined Benefit Plan Disclosure [Line Items]      
Percent of plan assets invested in actively managed investment funds 76.00%iep_PercentOfPlanAssetsInvestedInActivelyManagedInvestmentFunds
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Curtailment gain 38us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
United States Plans | Equity securities
     
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Actual Plan Asset Allocations 50.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
United States Plans | Fixed Income Investments [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Actual Plan Asset Allocations 25.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeInvestmentsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
United States Plans | Other Investments [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Actual Plan Asset Allocations 25.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_OtherInvestmentsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Non-U.S. Plans | Equity securities
     
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Actual Plan Asset Allocations 5.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Non-U.S. Plans | Insurance contracts
     
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Actual Plan Asset Allocations 80.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= iep_InsuranceContractsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Non-U.S. Plans | Debt Securities [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Actual Plan Asset Allocations 15.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Selling, general and administrative | United States Plans      
Defined Benefit Plan Disclosure [Line Items]      
Curtailment gain 19us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Other income, net | United States Plans      
Defined Benefit Plan Disclosure [Line Items]      
Curtailment gain $ 19us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember