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Operating Units Gaming Segment (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 table_games slot_machines sqft casinos hotel_rooms | Apr. 02, 2014 | Jul. 02, 2014
Tropicana [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of casinos | 8 iep_NumberOfCasinos / dei_LegalEntityAxis = iep_TropicanaMember |  |
Square footage of casino space | 390,900 iep_CasinoSpaceSquareFootage / dei_LegalEntityAxis = iep_TropicanaMember |  |
Number of slot machines | 8,035 iep_NumberOfSlotMachines / dei_LegalEntityAxis = iep_TropicanaMember |  |
Number of table games | 304 iep_NumberOfTableGames / dei_LegalEntityAxis = iep_TropicanaMember |  |
Number of hotel rooms | 5,525 iep_NumberOfHotelRooms / dei_LegalEntityAxis = iep_TropicanaMember |  |
Percentage of equity ownership in subsidiary | 67.90%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest / dei_LegalEntityAxis = iep_TropicanaMember |  |
Tropicana [Member] | LOUISIANA |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of casinos | 1 iep_NumberOfCasinos / dei_LegalEntityAxis = iep_TropicanaMember / iep_LocationOfOperationsStateOrCountryAxis = stpr_LA |  |
Tropicana [Member] | NEVADA |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of casinos | 2 iep_NumberOfCasinos / dei_LegalEntityAxis = iep_TropicanaMember / iep_LocationOfOperationsStateOrCountryAxis = stpr_NV |  |
Tropicana [Member] | INDIANA |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of casinos | 1 iep_NumberOfCasinos / dei_LegalEntityAxis = iep_TropicanaMember / iep_LocationOfOperationsStateOrCountryAxis = stpr_IN |  |
Tropicana [Member] | NEW JERSEY |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of casinos | 1 iep_NumberOfCasinos / dei_LegalEntityAxis = iep_TropicanaMember / iep_LocationOfOperationsStateOrCountryAxis = stpr_NJ |  |
Tropicana [Member] | ARUBA |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of casinos | 1 iep_NumberOfCasinos / dei_LegalEntityAxis = iep_TropicanaMember / iep_LocationOfOperationsStateOrCountryAxis = country_AW |  |
Tropicana [Member] | MISSISSIPPI |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of casinos | 1 iep_NumberOfCasinos / dei_LegalEntityAxis = iep_TropicanaMember / iep_LocationOfOperationsStateOrCountryAxis = stpr_MS |  |
Tropicana [Member] | MISSOURI |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of casinos | 1 iep_NumberOfCasinos / dei_LegalEntityAxis = iep_TropicanaMember / iep_LocationOfOperationsStateOrCountryAxis = stpr_MO |  |
Gaming Segment [Member] | Lumiere [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Payments to Acquire Businesses, Gross |  | $ 261 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = iep_LumiereMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember |
business combinations, recognized identifiable assets, net tangible assets | 252 iep_Businesscombinationsrecognizedidentifiableassetsnettangibleassets / us-gaap_BusinessAcquisitionAxis = iep_LumiereMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember |  |
business combinations, recognized identifiable assets, net intangible assets | 9 iep_Businesscombinationsrecognizedidentifiableassetsnetintangibleassets / us-gaap_BusinessAcquisitionAxis = iep_LumiereMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember |  |
River Palms [Member] | Gaming Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Proceeds from Divestiture of Businesses |  |  | $ 7 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = iep_RiverPalmsMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember

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