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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 | 16,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | $ 16,000 invest_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 | 63 invest_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 | 34 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = iep_FederalMogulMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 36 invest_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 | 0 iep_AccumulatedOtherComprehensiveIncomeLossCommodityPriceHedges / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / dei_LegalEntityAxis = iep_FederalMogulMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | $ 1 iep_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 | 0 iep_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 | 1 iep_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 |

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- Definition Accumulated other comprehensive income loss commodity price hedges. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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