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Other (Loss) Income, Net (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Component of Other Income (Loss), Net [Line Items] |  |
Other (loss) income, net | $ (27)us-gaap_OtherNonoperatingIncomeExpense | $ 35 us-gaap_OtherNonoperatingIncomeExpense
Realized and unrealized gain (loss) on derivatives, net |  |
Component of Other Income (Loss), Net [Line Items] |  |
Other (loss) income, net | (51)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_UnrealizedgainlossonderivativesMember | 109 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_UnrealizedgainlossonderivativesMember
(Loss) gain on disposition of assets |  |
Component of Other Income (Loss), Net [Line Items] |  |
Other (loss) income, net | 11 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember | 5 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember
Loss on extinguishment of debt (Note 10) |  |
Component of Other Income (Loss), Net [Line Items] |  |
Other (loss) income, net | (2)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember | (126)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember
Tax settlement gain |  |
Component of Other Income (Loss), Net [Line Items] |  |
Other (loss) income, net | 0 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_SettlementlosswithtaxingauthorityMember |
Equity earnings from non-consolidated affiliates |  |
Component of Other Income (Loss), Net [Line Items] |  |
Other (loss) income, net | 14 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_IncomelossfromnonconsolidatedaffiliatesMember | 13 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_IncomelossfromnonconsolidatedaffiliatesMember
Foreign currency translation loss |  |
Component of Other Income (Loss), Net [Line Items] |  |
Other (loss) income, net | (2)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = us-gaap_ForeignCurrencyGainLossMember | (3)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = us-gaap_ForeignCurrencyGainLossMember
Other |  |
Component of Other Income (Loss), Net [Line Items] |  |
Other (loss) income, net | 3 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_OtherIncomeLossNotSpecifiedMember | 5 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_OtherIncomeLossNotSpecifiedMember
Gaming Segment [Member] |  |
Component of Other Income (Loss), Net [Line Items] |  |
Other (loss) income, net | (1)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember | 37 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Tax refund as result of Trop AC tax appeal settlement |  | $ 32 iep_TaxrefundasresultofTropACtaxappealsettlement / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember

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- Definition Tax refund as result of Trop AC tax appeal settlement + References No definition available. + Details
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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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