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Goodwill and Intangible Assets, Net Definite-lived and Indefinite-lived Intangible Assets Table (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Definite-lived intangible assets: [Abstract] |  |
Definite-lived intangible assets, Gross Carrying Amount | $ 1,372 us-gaap_FiniteLivedIntangibleAssetsGross | $ 1,305 us-gaap_FiniteLivedIntangibleAssetsGross
Definite-lived intangible assets, Accumulated Amortization | (534)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (512)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Definite-lived intangible assets, Net Carrying Value | 838 us-gaap_FiniteLivedIntangibleAssetsNet | 793 us-gaap_FiniteLivedIntangibleAssetsNet
Indefinite-lived intangible assets: [Abstract] |  |
Indefinite-lived intangible assets, Net Carrying Value | 295 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill | 295 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Intangible assets, net | 1,133 us-gaap_IntangibleAssetsNetExcludingGoodwill | 1,088 us-gaap_IntangibleAssetsNetExcludingGoodwill
Trademarks and brand names |  |
Indefinite-lived intangible assets: [Abstract] |  |
Indefinite-lived intangible assets, Net Carrying Value | 257 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 257 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember
Gaming licenses |  |
Indefinite-lived intangible assets: [Abstract] |  |
Indefinite-lived intangible assets, Net Carrying Value | 38 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = iep_GamingLicenseMember | 38 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = iep_GamingLicenseMember
Customer relationships |  |
Definite-lived intangible assets: [Abstract] |  |
Definite-lived intangible assets, Gross Carrying Amount | 1,006 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 957 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Definite-lived intangible assets, Accumulated Amortization | (360)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (345)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Definite-lived intangible assets, Net Carrying Value | 646 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 612 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Developed technology |  |
Definite-lived intangible assets: [Abstract] |  |
Definite-lived intangible assets, Gross Carrying Amount | 138 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 120 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Definite-lived intangible assets, Accumulated Amortization | (81)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | (77)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Definite-lived intangible assets, Net Carrying Value | 57 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 43 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
In-place leases |  |
Definite-lived intangible assets: [Abstract] |  |
Definite-lived intangible assets, Gross Carrying Amount | 121 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember | 121 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
Definite-lived intangible assets, Accumulated Amortization | (65)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember | (63)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
Definite-lived intangible assets, Net Carrying Value | 56 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember | 58 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
Gasification technology license |  |
Definite-lived intangible assets: [Abstract] |  |
Definite-lived intangible assets, Gross Carrying Amount | 60 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iep_GasificationTechnologyMember | 60 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iep_GasificationTechnologyMember
Definite-lived intangible assets, Accumulated Amortization | (7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iep_GasificationTechnologyMember | (7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iep_GasificationTechnologyMember
Definite-lived intangible assets, Net Carrying Value | 53 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iep_GasificationTechnologyMember | 53 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iep_GasificationTechnologyMember
Other |  |
Definite-lived intangible assets: [Abstract] |  |
Definite-lived intangible assets, Gross Carrying Amount | 47 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember | 47 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember
Definite-lived intangible assets, Accumulated Amortization | (21)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember | (20)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember
Definite-lived intangible assets, Net Carrying Value | $ 26 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember | $ 27 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_UnclassifiedIndefinitelivedIntangibleAssetsMember

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