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Subsequent Events (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended
Feb. 20, 2015
May 05, 2015
Apr. 25, 2015
Subsequent Event [Line Items]      
Distribution declared per depositary unit $ 1.50us-gaap_CommonStockDividendsPerShareDeclared    
Distribution declared [Member]      
Subsequent Event [Line Items]      
Distribution declared per depositary unit   $ 1.50us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_DividendDeclaredMember		  
Ferrous Resources [Member] | Metals Segment [Member] | Agreement to purchase business assets [Member]      
Subsequent Event [Line Items]      
Amount of backstop of rights offering     $ 40iep_Amountofbackstopofrightsoffering
/ us-gaap_BusinessAcquisitionAxis
= iep_FerrousResourcesMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_MetalsSegmentMember
/ us-gaap_SubsequentEventTypeAxis
= iep_AgreementtopurchasebusinessassetsMember
Business combination, commitment to purchase     $ 230iep_Businesscombinationcommitmenttopurchase
/ us-gaap_BusinessAcquisitionAxis
= iep_FerrousResourcesMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_MetalsSegmentMember
/ us-gaap_SubsequentEventTypeAxis
= iep_AgreementtopurchasebusinessassetsMember