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Property, Plant and Equipment, Net (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | $ 12,566 us-gaap_PropertyPlantAndEquipmentGross | $ 11,289 us-gaap_PropertyPlantAndEquipmentGross |
Less: Accumulated depreciation and amortization | (3,611)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (3,212)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |
Property, plant and equipment, net | 8,955 us-gaap_PropertyPlantAndEquipmentNet | 8,077 us-gaap_PropertyPlantAndEquipmentNet |
Depreciation and amortization expense related to property, plant and equipment | 700 us-gaap_Depreciation | 622 us-gaap_Depreciation | 529 us-gaap_Depreciation
Land [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 489 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember | 465 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember |
Building and Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, gross | 2,353 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember | 2,107 us-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 | 5,594 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = iep_MachineryEquipmentAndFurnitureMember | 5,068 us-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 | 3,546 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsLeasedToOthersMember | 3,017 us-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 | 584 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember | 632 us-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 | 3,100 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsLeasedToOthersMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = iep_RailcarsMember | 2,600 us-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 | $ 450 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsLeasedToOthersMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = iep_RealestatepropertiesMember | $ 462 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsLeasedToOthersMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = iep_RealestatepropertiesMember |

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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