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Goodwill and Intangible Assets, Net Goodwill Table (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Goodwill [Line Items] |  |
Goodwill, Gross | $ 2,377 us-gaap_GoodwillGross | $ 2,329 us-gaap_GoodwillGross
Goodwill, Accumulated Impairment | (329)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (329)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill, Net Carrying Value | 2,048 us-gaap_Goodwill | 2,000 us-gaap_Goodwill
Automotive Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Gross | 1,437 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 1,389 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Goodwill, Accumulated Impairment | (226)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | (226)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Goodwill, Net Carrying Value | 1,211 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 1,163 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Energy Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Gross | 930 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 930 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Goodwill, Accumulated Impairment | (103)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | (103)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Goodwill, Net Carrying Value | 827 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 827 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Railcar Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Gross | 7 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 7 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Goodwill, Accumulated Impairment | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Goodwill, Net Carrying Value | 7 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 7 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Food Packaging Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Gross | 3 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 3 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Goodwill, Accumulated Impairment | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Goodwill, Net Carrying Value | $ 3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | $ 3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Name: | us-gaap_StatementBusinessSegmentsAxis=iep_EnergySegmentMember
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- Details
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