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Segment and Geographic Reporting Geographic Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 3,982 us-gaap_SalesRevenueGoodsNet | $ 4,557 us-gaap_SalesRevenueGoodsNet | $ 4,867 us-gaap_SalesRevenueGoodsNet | $ 4,666 us-gaap_SalesRevenueGoodsNet | $ 4,533 us-gaap_SalesRevenueGoodsNet | $ 4,181 us-gaap_SalesRevenueGoodsNet | $ 4,497 us-gaap_SalesRevenueGoodsNet | $ 4,574 us-gaap_SalesRevenueGoodsNet | $ 18,072 us-gaap_SalesRevenueGoodsNet | $ 17,785 us-gaap_SalesRevenueGoodsNet | $ 14,574 us-gaap_SalesRevenueGoodsNet
Other revenues from operations |  |  |  |  |  |  |  |  | 1,250 us-gaap_OtherSalesRevenueNet | 988 us-gaap_OtherSalesRevenueNet | 951 us-gaap_OtherSalesRevenueNet
Property, plant and equipment, net | 8,955 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 8,077 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 8,955 us-gaap_PropertyPlantAndEquipmentNet | 8,077 us-gaap_PropertyPlantAndEquipmentNet |
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 13,086 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US | 13,171 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US | 10,202 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US
Other revenues from operations |  |  |  |  |  |  |  |  | 1,169 us-gaap_OtherSalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 937 us-gaap_OtherSalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 914 us-gaap_OtherSalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Property, plant and equipment, net | 6,903 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 6,207 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US |  |  |  | 6,903 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US | 6,207 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US |
Geographic information, Germany [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,507 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_DE | 1,339 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_DE | 1,175 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_DE
Other revenues from operations |  |  |  |  |  |  |  |  | 0 us-gaap_OtherSalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE | 0 us-gaap_OtherSalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE | 0 us-gaap_OtherSalesRevenueNet / us-gaap_StatementGeographicalAxis = country_DE
Property, plant and equipment, net | 423 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_DE |  |  |  | 425 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_DE |  |  |  | 423 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_DE | 425 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_DE |
Geographic information, Other [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,479 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = iep_SegmentgeographicOtherMember | 3,275 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = iep_SegmentgeographicOtherMember | 3,197 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = iep_SegmentgeographicOtherMember
Other revenues from operations |  |  |  |  |  |  |  |  | 81 us-gaap_OtherSalesRevenueNet / us-gaap_StatementGeographicalAxis = iep_SegmentgeographicOtherMember | 51 us-gaap_OtherSalesRevenueNet / us-gaap_StatementGeographicalAxis = iep_SegmentgeographicOtherMember | 37 us-gaap_OtherSalesRevenueNet / us-gaap_StatementGeographicalAxis = iep_SegmentgeographicOtherMember
Property, plant and equipment, net | $ 1,629 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = iep_SegmentgeographicOtherMember |  |  |  | $ 1,445 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = iep_SegmentgeographicOtherMember |  |  |  | $ 1,629 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = iep_SegmentgeographicOtherMember | $ 1,445 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = iep_SegmentgeographicOtherMember |

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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 Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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