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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	$ 2,329us-gaap_GoodwillGross	$ 2,300us-gaap_GoodwillGross	$ 2,308us-gaap_GoodwillGross
Acquisitions	32us-gaap_GoodwillAcquiredDuringPeriod
Accumulated impairment	(329)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss	(226)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss	(226)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Impairment of goodwill	(103)us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Net carrying value	2,000us-gaap_Goodwill	2,074us-gaap_Goodwill
Adjustment to step-up value		8us-gaap_GoodwillPeriodIncreaseDecrease
Goodwill, Translation Adjustments	(3)us-gaap_GoodwillTranslationAdjustments	(16)us-gaap_GoodwillTranslationAdjustments
Automotive Segment [Member]
Goodwill [Line Items]
Gross carrying amount	1,389us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember	1,360us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember	1,368us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Acquisitions	32us-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	0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember	0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Net carrying value	1,163us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember	1,134us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Adjustment to step-up value		8us-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	930us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember	930us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember	930us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Acquisitions	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Accumulated impairment	(103)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Impairment of goodwill	(103)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember	0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Net carrying value	827us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember	930us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Adjustment to step-up value		0us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Goodwill, Translation Adjustments	0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember	0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Railcar Segment [Member]
Goodwill [Line Items]
Gross carrying amount	7us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	7us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	7us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Acquisitions	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Accumulated impairment	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Impairment of goodwill	0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Net carrying value	7us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	7us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Adjustment to step-up value		0us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Goodwill, Translation Adjustments	0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Food Packaging Segment [Member]
Goodwill [Line Items]
Gross carrying amount	3us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember	3us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember	3us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Acquisitions	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Accumulated impairment	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Impairment of goodwill	0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember	0us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Net carrying value	3us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember	3us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Adjustment to step-up value		0us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Goodwill, Translation Adjustments	$ 0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember	$ 0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember

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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.

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