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Other Income (Loss), Net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	$ 182us-gaap_OtherNonoperatingIncomeExpense	$ 21us-gaap_OtherNonoperatingIncomeExpense	$ (175)us-gaap_OtherNonoperatingIncomeExpense
Loss on extinguishment of debt (Note 10)
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	(162)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember	0us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember	(10)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember
Realized and unrealized gain (loss) on derivatives, net (Note 7)
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	186us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_UnrealizedgainlossonderivativesMember	57us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_UnrealizedgainlossonderivativesMember	(190)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_UnrealizedgainlossonderivativesMember
Tax settlement gain (loss)
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	32us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_SettlementlosswithtaxingauthorityMember	(23)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_SettlementlosswithtaxingauthorityMember	0us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_SettlementlosswithtaxingauthorityMember
Net gain (loss) on disposition of assets
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	25us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember	(56)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember	5us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember
Predecessor claim settlement
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	53us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_PredecessorclaimsettlementMember	0us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_PredecessorclaimsettlementMember	0us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_PredecessorclaimsettlementMember
Equity earnings from non-consolidated affiliates
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	50us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_IncomelossfromnonconsolidatedaffiliatesMember	26us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_IncomelossfromnonconsolidatedaffiliatesMember	35us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_IncomelossfromnonconsolidatedaffiliatesMember
Foreign currency translation loss
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	(10)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = us-gaap_ForeignCurrencyGainLossMember	(12)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = us-gaap_ForeignCurrencyGainLossMember	(9)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = us-gaap_ForeignCurrencyGainLossMember
Other
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	8us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_OtherIncomeLossNotSpecifiedMember	29us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_OtherIncomeLossNotSpecifiedMember	(6)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_OtherIncomeLossNotSpecifiedMember
France [Member] | Net gain (loss) on disposition of assets
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	(48)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember / dei_EntityByLocationAxis = iep_FranceMember
Canada and UK [Member] | Net gain (loss) on disposition of assets
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	(6)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember / dei_EntityByLocationAxis = iep_CanadaandUKMember
United States | Net gain (loss) on disposition of assets
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	(6)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember / dei_EntityByLocationAxis = country_US
Gaming Segment [Member]
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	88us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember	(5)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember	(3)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Automotive Segment [Member]
Component of Other Income (Loss), Net [Line Items]
Other (loss) income, net	2us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember	(32)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember	8us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
United States Plans | Automotive Segment [Member]
Component of Other Income (Loss), Net [Line Items]
Curtailment gain	38us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
United States Plans | Automotive Segment [Member] | Other income, net
Component of Other Income (Loss), Net [Line Items]
Curtailment gain	$ 19us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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