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Financial Instruments Gain (Loss) Recognized on Derivatives Not Designated as Hedging Table (Details) (Not Designated as Hedging Instrument [Member], Net gain (loss) from investment activities [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Income | $ (1)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | [1] | $ (51)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | [1]
Equity contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Income | (165)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EquityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = iep_NetGainFromInvestmentActivitiesMember | [1] | (176)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EquityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = iep_NetGainFromInvestmentActivitiesMember | [1]
Foreign exchange contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Income | 174 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = iep_NetGainFromInvestmentActivitiesMember | [1] | 0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = iep_NetGainFromInvestmentActivitiesMember | [1]
Credit contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Income | (29)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditRiskContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = iep_NetGainFromInvestmentActivitiesMember | [1] | (6)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditRiskContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = iep_NetGainFromInvestmentActivitiesMember | [1]
Commodity contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (Loss) Recognized in Income | $ 19 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = iep_NetGainFromInvestmentActivitiesMember | [1] | $ 131 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = iep_NetGainFromInvestmentActivitiesMember | [1]
[1] | Gains (losses) recognized on derivatives are classified in net gain (loss) from investment activities in our condensed consolidated statements of operations for our Investment segment and are included in other (loss) income, net for all other segments.

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
Name: | us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration