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Fair Value Measurements Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	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	$ 96us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember	$ 32us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember
Distribution-in-kind	(110)iep_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetdistributioninkind / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember	0iep_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	100us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember	(4)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember
Distribution-in-kind	110iep_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetdistributioninkind / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember	0iep_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	$ 68us-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

X

- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, distribution in kind

+ References

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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)

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920



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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

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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

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