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Financial Instruments Investment Segment and Holding Company Narrative (Details) (Investment Segment [Member], Investment Funds [Member], USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Derivative [Line Items] |  |  |
Maximum payout amounts relating to put options written | $ 6,500,000,000 iep_OpenOptionContractWrittenPotentialPaymentAmount |  | $ 2,500,000,000 iep_OpenOptionContractWrittenPotentialPaymentAmount
Open Option Contracts Written, Covered Put Options on Existing Short Positions | 6,500,000,000 iep_OpenOptionContractsWrittenCoveredPutOptionsOnExistingShortPositions |  | 2,400,000,000 iep_OpenOptionContractsWrittenCoveredPutOptionsOnExistingShortPositions
Fair value of derivative instruments with credit-risk related contingent features in a liability position | 840,000,000 us-gaap_CreditRiskDerivativeLiabilitiesAtFairValue |  | 614,000,000 us-gaap_CreditRiskDerivativeLiabilitiesAtFairValue
Cash collateral posted for derivative positions | 1,800,000,000 us-gaap_CollateralAlreadyPostedAggregateFairValue |  | 1,200,000,000 us-gaap_CollateralAlreadyPostedAggregateFairValue
Put Option [Member] |  |  |
Derivative [Line Items] |  |  |
Realized and unrealized gain (loss) on derivatives, net | $ 41,000,000 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_PutOptionMember / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | $ (1,000,000)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_PutOptionMember / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |

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- Definition Open Option Contracts Written, Covered Put Options on Existing Short Positions + References No definition available. + Details
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Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The maximum payout of the open option contracts written for the investment. + References No definition available. + Details
Name: | iep_OpenOptionContractWrittenPotentialPaymentAmount
Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624258-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value of credit risk derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5708775-113959 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |