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Fair Value Measurements Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Other Segments and Holding Company [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Gross unrealized losses $ (14)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_StatementBusinessSegmentsAxis
= iep_OtherSegmentsAndHoldingCompanyMember
$ (14)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_StatementBusinessSegmentsAxis
= iep_OtherSegmentsAndHoldingCompanyMember
 
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member]      
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 1us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_StatementBusinessSegmentsAxis
= iep_InvestmentSegmentMember
(1)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_StatementBusinessSegmentsAxis
= iep_InvestmentSegmentMember
 
Holding Company [Member]      
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, distribution in kind     $ 110iep_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetdistributioninkind
/ us-gaap_StatementBusinessSegmentsAxis
= iep_HoldingCompanyMember