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Debt Table (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Debt Instrument [Line Items] |  |
Debt | $ 12,088 us-gaap_DebtAndCapitalLeaseObligations | $ 11,588 us-gaap_DebtAndCapitalLeaseObligations
Automotive Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 2,904 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 2,690 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Energy Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 675 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 675 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Gaming Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 294 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember | 295 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Railcar Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 2,420 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 2,133 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Food Packaging Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 273 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 274 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Real Estate Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 31 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_RealEstateSegmentMember | 32 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_RealEstateSegmentMember
Home Fashion Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_HomeFashionSegmentMember | 0 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_HomeFashionSegmentMember
Senior unsecured notes [Member] | 2022 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 1,338 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2022NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember | 1,337 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2022NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember
Senior unsecured notes [Member] | 2020 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 1,708 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2020NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember | 1,708 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2020NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember
Senior unsecured notes [Member] | 2019 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 1,270 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2019NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember | 1,270 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2019NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember
Senior unsecured notes [Member] | 2017 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 1,172 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2017NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember | 1,171 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2017NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember
Senior unsecured notes [Member] | Railcar Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 2,420 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 2,133 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Debt facilities [Member] | Automotive Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 2,792 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = iep_DebtFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 2,584 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = iep_DebtFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Debt facilities [Member] | Energy Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 625 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = iep_DebtFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 625 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = iep_DebtFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Secured credit facilities [Member] | Gaming Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 294 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember | 295 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Secured credit facilities [Member] | Food Packaging Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 271 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 272 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Mortgages payable [Member] | Real Estate Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 30 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RealEstateSegmentMember | 31 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RealEstateSegmentMember
Other Debt Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 168 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember | 162 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember
Icahn Enterprises Holdings [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 12,088 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 11,588 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Icahn Enterprises Holdings [Member] | Senior unsecured notes [Member] | 2022 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 1,338 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2022NotesMember / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember | 1,337 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2022NotesMember / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember
Icahn Enterprises Holdings [Member] | Senior unsecured notes [Member] | 2020 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 1,708 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2020NotesMember / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember | 1,708 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2020NotesMember / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember
Icahn Enterprises Holdings [Member] | Senior unsecured notes [Member] | 2019 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 1,270 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2019NotesMember / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember | 1,270 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2019NotesMember / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember
Icahn Enterprises Holdings [Member] | Senior unsecured notes [Member] | 2017 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 1,172 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2017NotesMember / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember | 1,171 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = iep_A2017NotesMember / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember
Icahn Enterprises Holdings [Member] | Senior unsecured notes [Member] | Railcar Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 2,420 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 2,133 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Icahn Enterprises Holdings [Member] | Debt facilities [Member] | Automotive Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 2,792 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = iep_DebtFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 2,584 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = iep_DebtFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Icahn Enterprises Holdings [Member] | Debt facilities [Member] | Energy Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 625 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = iep_DebtFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 625 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = iep_DebtFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Icahn Enterprises Holdings [Member] | Secured credit facilities [Member] | Gaming Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 294 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember | 295 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Icahn Enterprises Holdings [Member] | Secured credit facilities [Member] | Food Packaging Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 271 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 272 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Icahn Enterprises Holdings [Member] | Mortgages payable [Member] | Real Estate Segment [Member] |  |
Debt Instrument [Line Items] |  |
Debt | 30 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RealEstateSegmentMember | 31 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RealEstateSegmentMember
Icahn Enterprises Holdings [Member] | Other Debt Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Debt | $ 168 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember | $ 162 us-gaap_DebtAndCapitalLeaseObligations / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_LongtermDebtTypeAxis = us-gaap_OtherDebtSecuritiesMember

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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Namespace Prefix: |
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- Details
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