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Financial Instruments Derivative Activities Table (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012
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Equity swaps |
Primary underlying risk: |
Long Notional Exposure | $ 1
Short Notional Exposure | 10,508
Foreign currency forwards |
Primary underlying risk: |
Long Notional Exposure | 12
Short Notional Exposure | 1,676
Interest rate swap contracts |
Primary underlying risk: |
Long Notional Exposure | 0
Short Notional Exposure | 63
Commodity contracts |
Primary underlying risk: |
Long Notional Exposure | 60
Short Notional Exposure | $ 669

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- Definition Notional Exposure of Derivatives, Long Position + References No definition available. + Details
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Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Notional Exposure of Derivatives, Short Position + References No definition available. + Details
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Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | iep_
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Balance Type: | na
Period Type: | duration