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Property, Plant and Equipment, Net (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 12,566us-gaap_PropertyPlantAndEquipmentGross $ 11,289us-gaap_PropertyPlantAndEquipmentGross  
Less: Accumulated depreciation and amortization (3,611)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (3,212)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property, plant and equipment, net 8,955us-gaap_PropertyPlantAndEquipmentNet 8,077us-gaap_PropertyPlantAndEquipmentNet  
Depreciation and amortization expense related to property, plant and equipment 700us-gaap_Depreciation 622us-gaap_Depreciation 529us-gaap_Depreciation
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 489us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
465us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
 
Building and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 2,353us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
2,107us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
 
Building and Improvements [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life (in years) 4 years    
Building and Improvements [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life (in years) 40 years    
Machinery, Equipment, and Furniture [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 5,594us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= iep_MachineryEquipmentAndFurnitureMember
5,068us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= iep_MachineryEquipmentAndFurnitureMember
 
Machinery, Equipment, and Furniture [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life (in years) 1 year    
Machinery, Equipment, and Furniture [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life (in years) 40 years    
Assets Leased to Others [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 3,546us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsLeasedToOthersMember
3,017us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsLeasedToOthersMember
 
Less: Accumulated depreciation and amortization (957)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsLeasedToOthersMember
(896)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsLeasedToOthersMember
 
Assets Leased to Others [Member] | Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life (in years) 15 years    
Assets Leased to Others [Member] | Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, useful life (in years) 39 years    
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 584us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
632us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
 
Railcars [Member] | Assets Leased to Others [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 3,100us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsLeasedToOthersMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= iep_RailcarsMember
2,600us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsLeasedToOthersMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= iep_RailcarsMember
 
Real estate properties [Member] | Assets Leased to Others [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 450us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsLeasedToOthersMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= iep_RealestatepropertiesMember
$ 462us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsLeasedToOthersMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= iep_RealestatepropertiesMember