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Goodwill and Intangible Assets, Net Goodwill Table (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Line Items] |  |  |
Gross carrying amount | $ 2,329 us-gaap_GoodwillGross | $ 2,300 us-gaap_GoodwillGross | $ 2,308 us-gaap_GoodwillGross
Acquisitions | 32 us-gaap_GoodwillAcquiredDuringPeriod |  |
Accumulated impairment | (329)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (226)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (226)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Impairment of goodwill | (103)us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss |
Net carrying value | 2,000 us-gaap_Goodwill | 2,074 us-gaap_Goodwill |
Adjustment to step-up value |  | 8 us-gaap_GoodwillPeriodIncreaseDecrease |
Goodwill, Translation Adjustments | (3)us-gaap_GoodwillTranslationAdjustments | (16)us-gaap_GoodwillTranslationAdjustments |
Automotive Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Gross carrying amount | 1,389 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 1,360 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 1,368 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Acquisitions | 32 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |
Accumulated impairment | (226)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | (226)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | (226)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Impairment of goodwill | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Net carrying value | 1,163 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 1,134 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Adjustment to step-up value |  | 8 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Goodwill, Translation Adjustments | (3)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | (16)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Energy Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Gross carrying amount | 930 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 930 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 930 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Acquisitions | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |
Accumulated impairment | (103)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Impairment of goodwill | (103)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |
Net carrying value | 827 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 930 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |
Adjustment to step-up value |  | 0 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |
Goodwill, Translation Adjustments | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |
Railcar Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Gross carrying amount | 7 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 7 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 7 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Acquisitions | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |
Accumulated impairment | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Impairment of goodwill | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |
Net carrying value | 7 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 7 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |
Adjustment to step-up value |  | 0 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |
Goodwill, Translation Adjustments | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |
Food Packaging Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Gross carrying amount | 3 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 3 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 3 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Acquisitions | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember |  |
Accumulated impairment | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Impairment of goodwill | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember |
Net carrying value | 3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember |
Adjustment to step-up value |  | 0 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember |
Goodwill, Translation Adjustments | $ 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | $ 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember |

X
- 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 of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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