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Financial Instruments Investment Segment and Holding Company Narrative (Details) (USD $) Share data in Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative [Line Items] |  |  |  |
Non-cash investment segment contribution | $ 0 iep_Noncashinvestmentsegmentcontribution |  | $ 185,000,000 iep_Noncashinvestmentsegmentcontribution | $ 0 iep_Noncashinvestmentsegmentcontribution
Cash collateral posted for derivative positions | 1,248,000,000 us-gaap_CollateralAlreadyPostedAggregateFairValue |  | 255,000,000 us-gaap_CollateralAlreadyPostedAggregateFairValue |
Credit default swaps(1) |  |  |  |
Derivative [Line Items] |  |  |  |
Short Notional Exposure | 1,493,000,000 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember | [1] | 0 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember |
Investment Segment [Member] | Investment Funds [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Open Option Contracts Written, Covered Put Options on Existing Short Positions | 2,400,000,000 iep_OpenOptionContractsWrittenCoveredPutOptionsOnExistingShortPositions / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 8,000,000,000 iep_OpenOptionContractsWrittenCoveredPutOptionsOnExistingShortPositions / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Fair value of derivative instruments with credit-risk related contingent features in a liability position | 614,000,000 us-gaap_CreditRiskDerivativeLiabilitiesAtFairValue / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 639,000,000 us-gaap_CreditRiskDerivativeLiabilitiesAtFairValue / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Open Option Contract Written, Potential Payment Amount | 2,500,000,000 iep_OpenOptionContractWrittenPotentialPaymentAmount / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 8,000,000,000 iep_OpenOptionContractWrittenPotentialPaymentAmount / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Investment Funds [Member] | Total Return Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized Gain (Loss) on Derivatives |  |  | 14,000,000 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_TotalReturnSwapMember / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Investment Funds [Member] | Put Option [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized Gain (Loss) on Derivatives | (1,000,000)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_PutOptionMember / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 131,000,000 us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_PutOptionMember / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Holding Company [Member] | Investment Segment [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Non-cash Investment segment contribution (derivative liability shares transferred) |  |  | 9.7 iep_NoncashInvestmentsegmentcontributionderivativeliabilitysharestransferred / us-gaap_CounterpartyNameAxis = iep_HoldingCompanyMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Non-cash investment segment contribution |  |  | 234,000,000 iep_Noncashinvestmentsegmentcontribution / us-gaap_CounterpartyNameAxis = iep_HoldingCompanyMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Koala [Member] | Investment Segment [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Non-cash Investment segment contribution (derivative liability shares transferred) |  |  | 7.7 iep_NoncashInvestmentsegmentcontributionderivativeliabilitysharestransferred / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_KoalaMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Non-cash investment segment contribution |  |  | $ 185,000,000 iep_Noncashinvestmentsegmentcontribution / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_KoalaMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
[1] | The short notional amount on our credit default swap positions is approximately $9.3 billion as of December 31, 2014. However, because credit spreads cannot compress below zero, our downside short notional exposure to loss is approximately $1.5 billion.

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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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- 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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- 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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