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Fair Value Measurements Narrative (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Holding Company [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross realized and unrealized losses | $ 96 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember | $ 32 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember
Distribution-in-kind | (110)iep_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetdistributioninkind / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember | 0 iep_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetdistributioninkind / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember
Investment Segment [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Gross realized and unrealized losses | 100 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | (4)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember
Distribution-in-kind | 110 iep_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetdistributioninkind / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | 0 iep_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetdistributioninkind / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember
Investment Segment [Member] | Level 3 [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Unrealized losses included in earnings related to Level 3 investments | $ 68 us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Equity investment [Member] | Automotive Segment [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 60.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_InvestmentTypeAxis = iep_EquityInvestmentMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Defined Benefit Plan, Target Plan Asset Allocations | 50.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_InvestmentTypeAxis = iep_EquityInvestmentMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Fixed Income Investments [Member] | Automotive Segment [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 23.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeInvestmentsMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Defined Benefit Plan, Target Plan Asset Allocations | 25.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeInvestmentsMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Other Investments [Member] | Automotive Segment [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 17.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_InvestmentTypeAxis = us-gaap_OtherInvestmentsMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Defined Benefit Plan, Target Plan Asset Allocations | 25.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_InvestmentTypeAxis = us-gaap_OtherInvestmentsMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Managed investment funds [Member] | Automotive Segment [Member] |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Defined Benefit Plan, Target Plan Asset Allocations | 76.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_InvestmentTypeAxis = iep_ManagedInvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, distribution in kind + References No definition available. + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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