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Financial Instruments Automotive Narrative (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Interest rate contracts(2) |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 16,000,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |
Investment Segment [Member] | Investment Funds [Member] |  |
Derivative [Line Items] |  |
Open Option Contracts Written, Covered Put Options on Existing Short Positions | 2,400,000,000 iep_OpenOptionContractsWrittenCoveredPutOptionsOnExistingShortPositions / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | 8,000,000,000 iep_OpenOptionContractsWrittenCoveredPutOptionsOnExistingShortPositions / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember
Automotive Segment [Member] | Federal-Mogul [Member] | Cash Flow Hedging [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount |  | 12,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = iep_FederalMogulMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Price Risk Cash Flow Hedge Derivatives, Contractual Term | 15 months |
Automotive Segment [Member] | Federal-Mogul [Member] | Cash Flow Hedging [Member] | Commodity contracts |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 36,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / dei_LegalEntityAxis = iep_FederalMogulMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 51,000,000 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] | 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] | VCS [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 | 2 iep_ConcentrationRiskNumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / dei_LegalEntityAxis = iep_FederalMogulMember / iep_ReportingUnitAxis = iep_VcsMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Concentration threshhold, balance sheet | 18.00%iep_ConcentrationThreshholdBalanceSheet / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / dei_LegalEntityAxis = iep_FederalMogulMember / iep_ReportingUnitAxis = iep_VcsMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Designated as Hedging Instrument [Member] | Automotive Segment [Member] | Federal-Mogul [Member] | Cash Flow Hedging [Member] |  |
Derivative [Line Items] |  |
Unrealized net gains (losses) on price hedge contracts | 1,000,000 us-gaap_UnrealizedLossOnPriceRiskCashFlowDerivativesBeforeTax / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / dei_LegalEntityAxis = iep_FederalMogulMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 1,000,000 us-gaap_UnrealizedLossOnPriceRiskCashFlowDerivativesBeforeTax / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / dei_LegalEntityAxis = iep_FederalMogulMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Unrealized net gains (losses) on foreign currency hedge contracts |  | $ (1,000,000)us-gaap_UnrealizedGainOnForeignCurrencyDerivativesBeforeTax / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / dei_LegalEntityAxis = iep_FederalMogulMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember

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- Definition Concentration Risk, Number of Customers + References No definition available. + Details
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- Definition Concentration Risk, Threshold + References No definition available. + Details
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- Definition Concentration threshhold, balance sheet + References No definition available. + Details
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- Definition Open Option Contracts Written, Covered Put Options on Existing Short Positions + 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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- Details
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- Definition Maximum period the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Amount of unrealized gain related to the increase in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount of unrealized loss related to the decrease in fair value of price risk derivatives designated as cash flow hedging instruments recorded in accumulated other comprehensive income in the period, before taxes, to the extent that the cash flow hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Details
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- Details
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- Details
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- Details
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