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v2.4.1.9

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

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- Definition Amount of backstop of rights offering + References No definition available. + Details
Name: | iep_Amountofbackstopofrightsoffering
Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Business combination, commitment to purchase + References No definition available. + Details
Name: | iep_Businesscombinationcommitmenttopurchase
Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=iep_FerrousResourcesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_DividendDeclaredMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |