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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 8iep_NumberOfCasinos
/ dei_LegalEntityAxis
= iep_TropicanaMember
   
Square footage of casino space 390,900iep_CasinoSpaceSquareFootage
/ dei_LegalEntityAxis
= iep_TropicanaMember
   
Number of slot machines 8,035iep_NumberOfSlotMachines
/ dei_LegalEntityAxis
= iep_TropicanaMember
   
Number of table games 304iep_NumberOfTableGames
/ dei_LegalEntityAxis
= iep_TropicanaMember
   
Number of hotel rooms 5,525iep_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 1iep_NumberOfCasinos
/ dei_LegalEntityAxis
= iep_TropicanaMember
/ iep_LocationOfOperationsStateOrCountryAxis
= stpr_LA
   
Tropicana [Member] | NEVADA      
Segment Reporting Information [Line Items]      
Number of casinos 2iep_NumberOfCasinos
/ dei_LegalEntityAxis
= iep_TropicanaMember
/ iep_LocationOfOperationsStateOrCountryAxis
= stpr_NV
   
Tropicana [Member] | INDIANA      
Segment Reporting Information [Line Items]      
Number of casinos 1iep_NumberOfCasinos
/ dei_LegalEntityAxis
= iep_TropicanaMember
/ iep_LocationOfOperationsStateOrCountryAxis
= stpr_IN
   
Tropicana [Member] | NEW JERSEY      
Segment Reporting Information [Line Items]      
Number of casinos 1iep_NumberOfCasinos
/ dei_LegalEntityAxis
= iep_TropicanaMember
/ iep_LocationOfOperationsStateOrCountryAxis
= stpr_NJ
   
Tropicana [Member] | ARUBA      
Segment Reporting Information [Line Items]      
Number of casinos 1iep_NumberOfCasinos
/ dei_LegalEntityAxis
= iep_TropicanaMember
/ iep_LocationOfOperationsStateOrCountryAxis
= country_AW
   
Tropicana [Member] | MISSISSIPPI      
Segment Reporting Information [Line Items]      
Number of casinos 1iep_NumberOfCasinos
/ dei_LegalEntityAxis
= iep_TropicanaMember
/ iep_LocationOfOperationsStateOrCountryAxis
= stpr_MS
   
Tropicana [Member] | MISSOURI      
Segment Reporting Information [Line Items]      
Number of casinos 1iep_NumberOfCasinos
/ dei_LegalEntityAxis
= iep_TropicanaMember
/ iep_LocationOfOperationsStateOrCountryAxis
= stpr_MO
   
Gaming Segment [Member] | Lumiere [Member]      
Segment Reporting Information [Line Items]      
Payments to Acquire Businesses, Gross   $ 261us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= iep_LumiereMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
 
business combinations, recognized identifiable assets, net tangible assets 252iep_Businesscombinationsrecognizedidentifiableassetsnettangibleassets
/ us-gaap_BusinessAcquisitionAxis
= iep_LumiereMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
   
business combinations, recognized identifiable assets, net intangible assets 9iep_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     $ 7us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= iep_RiverPalmsMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember