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Financial Instruments Automotive Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
number_of_customers
Dec. 31, 2014
Interest rate swap contracts    
Derivative [Line Items]    
Notional value of interest rate swap agreements 16,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
$ 16,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Energy Segment [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate swap contracts    
Derivative [Line Items]    
Notional value of interest rate swap agreements 63invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
 
Automotive Segment [Member] | Federal-Mogul [Member] | Cash Flow Hedging [Member] | Commodity contracts    
Derivative [Line Items]    
Notional value of interest rate swap agreements 34invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
36invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
Automotive Segment [Member] | Federal-Mogul [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]    
Derivative [Line Items]    
Unrealized net gains (losses) on price hedge contracts 0iep_AccumulatedOtherComprehensiveIncomeLossCommodityPriceHedges
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
$ 1iep_AccumulatedOtherComprehensiveIncomeLossCommodityPriceHedges
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
Automotive Segment [Member] | Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Federal-Mogul [Member]    
Derivative [Line Items]    
Number of customers accounting for more than 6% of direct sales 0iep_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
 
Concentration of risk threshold, percentage of direct sales 6.00%iep_ConcentrationRiskThreshold
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
 
Automotive Segment [Member] | Motorparts [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] | Federal-Mogul [Member]    
Derivative [Line Items]    
Number of customers accounting for more than 6% of direct sales 1iep_ConcentrationRiskNumberOfCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ iep_ReportingUnitAxis
= iep_MotorpartsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
 
Concentration threshhold, balance sheet 11.00%iep_ConcentrationThreshholdBalanceSheet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ dei_LegalEntityAxis
= iep_FederalMogulMember
/ iep_ReportingUnitAxis
= iep_MotorpartsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember