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Other Income (Loss), Net (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | $ 182 us-gaap_OtherNonoperatingIncomeExpense | $ 21 us-gaap_OtherNonoperatingIncomeExpense | $ (175)us-gaap_OtherNonoperatingIncomeExpense
Loss on extinguishment of debt (Note 10) |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | (162)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember | 0 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember | (10)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember
Realized and unrealized gain (loss) on derivatives, net (Note 7) |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | 186 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_UnrealizedgainlossonderivativesMember | 57 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_UnrealizedgainlossonderivativesMember | (190)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_UnrealizedgainlossonderivativesMember
Tax settlement gain (loss) |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | 32 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_SettlementlosswithtaxingauthorityMember | (23)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_SettlementlosswithtaxingauthorityMember | 0 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_SettlementlosswithtaxingauthorityMember
Net gain (loss) on disposition of assets |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | 25 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember | (56)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember | 5 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember
Predecessor claim settlement |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | 53 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_PredecessorclaimsettlementMember | 0 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_PredecessorclaimsettlementMember | 0 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_PredecessorclaimsettlementMember
Equity earnings from non-consolidated affiliates |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | 50 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_IncomelossfromnonconsolidatedaffiliatesMember | 26 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_IncomelossfromnonconsolidatedaffiliatesMember | 35 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_IncomelossfromnonconsolidatedaffiliatesMember
Foreign currency translation loss |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | (10)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = us-gaap_ForeignCurrencyGainLossMember | (12)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = us-gaap_ForeignCurrencyGainLossMember | (9)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = us-gaap_ForeignCurrencyGainLossMember
Other |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | 8 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_OtherIncomeLossNotSpecifiedMember | 29 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_OtherIncomeLossNotSpecifiedMember | (6)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_OtherIncomeLossNotSpecifiedMember
France [Member] | Net gain (loss) on disposition of assets |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | (48)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember / dei_EntityByLocationAxis = iep_FranceMember |  |
Canada and UK [Member] | Net gain (loss) on disposition of assets |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | (6)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember / dei_EntityByLocationAxis = iep_CanadaandUKMember |  |
United States | Net gain (loss) on disposition of assets |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | (6)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_GainlossondispositionsofassetsMember / dei_EntityByLocationAxis = country_US |  |
Gaming Segment [Member] |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | 88 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember | (5)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember | (3)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Automotive Segment [Member] |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Other (loss) income, net | 2 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | (32)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 8 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
United States Plans | Automotive Segment [Member] |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Curtailment gain | 38 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |
United States Plans | Automotive Segment [Member] | Other income, net |  |  |
Component of Other Income (Loss), Net [Line Items] |  |  |
Curtailment gain | $ 19 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |

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- Definition The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + 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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