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Schedule I Condensed Financial Information of Parent - Statements of Operations (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net (loss) gain from investment activities |  |  |  |  |  |  |  |  | $ (564)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | $ 1,694 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments | $ 343 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
Interest and dividend income |  |  |  |  |  |  |  |  | 217 us-gaap_InterestAndDividendIncomeOperating | 194 us-gaap_InterestAndDividendIncomeOperating | 103 us-gaap_InterestAndDividendIncomeOperating
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | (162)us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | (10)us-gaap_GainsLossesOnExtinguishmentOfDebt
Other income (loss), net |  |  |  |  |  |  |  |  | 182 us-gaap_OtherNonoperatingIncomeExpense | 21 us-gaap_OtherNonoperatingIncomeExpense | (175)us-gaap_OtherNonoperatingIncomeExpense
Total Revenues | 3,366 us-gaap_Revenues | 4,422 us-gaap_Revenues | 6,379 us-gaap_Revenues | 4,990 us-gaap_Revenues | 4,872 us-gaap_Revenues | 5,771 us-gaap_Revenues | 4,670 us-gaap_Revenues | 5,369 us-gaap_Revenues | 19,157 us-gaap_Revenues | 20,682 us-gaap_Revenues | 15,796 us-gaap_Revenues
Interest expense |  |  |  |  |  |  |  |  | 847 us-gaap_InterestExpense | 560 us-gaap_InterestExpense | 572 us-gaap_InterestExpense
Selling, general and administrative |  |  |  |  |  |  |  |  | 1,625 us-gaap_SellingGeneralAndAdministrativeExpense | 1,417 us-gaap_SellingGeneralAndAdministrativeExpense | 1,275 us-gaap_SellingGeneralAndAdministrativeExpense
Total Expenses |  |  |  |  |  |  |  |  | 19,789 iep_TotalExpenses | 18,356 iep_TotalExpenses | 15,115 iep_TotalExpenses
Net (loss) income | (1,102)us-gaap_ProfitLoss | (627)us-gaap_ProfitLoss | 1,123 us-gaap_ProfitLoss | 77 us-gaap_ProfitLoss | 405 us-gaap_ProfitLoss | 1,236 us-gaap_ProfitLoss | 93 us-gaap_ProfitLoss | 710 us-gaap_ProfitLoss | (529)us-gaap_ProfitLoss | 2,444 us-gaap_ProfitLoss | 762 us-gaap_ProfitLoss
Limited partners |  |  |  |  |  |  |  |  | (366)us-gaap_NetIncomeLossAllocatedToLimitedPartners | 1,005 us-gaap_NetIncomeLossAllocatedToLimitedPartners | 379 us-gaap_NetIncomeLossAllocatedToLimitedPartners
General partner |  |  |  |  |  |  |  |  | (7)us-gaap_NetIncomeLossAllocatedToGeneralPartners | 20 us-gaap_NetIncomeLossAllocatedToGeneralPartners | 17 us-gaap_NetIncomeLossAllocatedToGeneralPartners
Icahn Enterprises Holdings [Member] |  |  |  |  |  |  |  |  |  |  |
Net (loss) gain from investment activities |  |  |  |  |  |  |  |  | (564)us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 1,694 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 343 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Interest and dividend income |  |  |  |  |  |  |  |  | 217 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 194 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 103 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | (162)us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | (10)us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Other income (loss), net |  |  |  |  |  |  |  |  | 182 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 21 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | (175)us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Total Revenues |  |  |  |  |  |  |  |  | 19,157 us-gaap_Revenues / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 20,682 us-gaap_Revenues / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 15,796 us-gaap_Revenues / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Interest expense |  |  |  |  |  |  |  |  | 846 us-gaap_InterestExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 560 us-gaap_InterestExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 571 us-gaap_InterestExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Selling, general and administrative |  |  |  |  |  |  |  |  | 1,625 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 1,417 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 1,275 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Total Expenses |  |  |  |  |  |  |  |  | 19,788 iep_TotalExpenses / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 18,356 iep_TotalExpenses / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 15,114 iep_TotalExpenses / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Net (loss) income |  |  |  |  |  |  |  |  | (528)us-gaap_ProfitLoss / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 2,444 us-gaap_ProfitLoss / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 763 us-gaap_ProfitLoss / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Limited partners |  |  |  |  |  |  |  |  | (368)us-gaap_NetIncomeLossAllocatedToLimitedPartners / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 1,015 us-gaap_NetIncomeLossAllocatedToLimitedPartners / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 384 us-gaap_NetIncomeLossAllocatedToLimitedPartners / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
General partner |  |  |  |  |  |  |  |  | (4)us-gaap_NetIncomeLossAllocatedToGeneralPartners / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 10 us-gaap_NetIncomeLossAllocatedToGeneralPartners / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 13 us-gaap_NetIncomeLossAllocatedToGeneralPartners / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | (108)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 26 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 1,328 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 680 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Interest expense |  |  |  |  |  |  |  |  | (291)us-gaap_InterestExpense / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | (303)us-gaap_InterestExpense / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | (284)us-gaap_InterestExpense / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Net (loss) income |  |  |  |  |  |  |  |  | (373)us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 1,025 us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 396 us-gaap_ProfitLoss / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Limited partners |  |  |  |  |  |  |  |  | (366)us-gaap_NetIncomeLossAllocatedToLimitedPartners / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 1,005 us-gaap_NetIncomeLossAllocatedToLimitedPartners / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 379 us-gaap_NetIncomeLossAllocatedToLimitedPartners / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
General partner |  |  |  |  |  |  |  |  | (7)us-gaap_NetIncomeLossAllocatedToGeneralPartners / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 20 us-gaap_NetIncomeLossAllocatedToGeneralPartners / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 17 us-gaap_NetIncomeLossAllocatedToGeneralPartners / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Parent Company [Member] | Icahn Enterprises Holdings [Member] |  |  |  |  |  |  |  |  |  |  |
Net (loss) gain from investment activities |  |  |  |  |  |  |  |  | 0 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 0 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 8 us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Interest and dividend income |  |  |  |  |  |  |  |  | 1 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 0 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 0 us-gaap_InterestAndDividendIncomeOperating / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | (108)us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 28 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 1,342 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 682 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Other income (loss), net |  |  |  |  |  |  |  |  | 20 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 15 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 16 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Total Revenues |  |  |  |  |  |  |  |  | (59)us-gaap_Revenues / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 1,357 us-gaap_Revenues / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 706 us-gaap_Revenues / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Interest expense |  |  |  |  |  |  |  |  | 290 us-gaap_InterestExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 305 us-gaap_InterestExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 286 us-gaap_InterestExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Selling, general and administrative |  |  |  |  |  |  |  |  | 23 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 27 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 23 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Total Expenses |  |  |  |  |  |  |  |  | 313 iep_TotalExpenses / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 332 iep_TotalExpenses / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 309 iep_TotalExpenses / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Net (loss) income |  |  |  |  |  |  |  |  | (372)us-gaap_ProfitLoss / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 1,025 us-gaap_ProfitLoss / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 397 us-gaap_ProfitLoss / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
Limited partners |  |  |  |  |  |  |  |  | (368)us-gaap_NetIncomeLossAllocatedToLimitedPartners / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 1,015 us-gaap_NetIncomeLossAllocatedToLimitedPartners / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | 384 us-gaap_NetIncomeLossAllocatedToLimitedPartners / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember
General partner |  |  |  |  |  |  |  |  | $ (4)us-gaap_NetIncomeLossAllocatedToGeneralPartners / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | $ 10 us-gaap_NetIncomeLossAllocatedToGeneralPartners / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember | $ 13 us-gaap_NetIncomeLossAllocatedToGeneralPartners / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember / us-gaap_StatementScenarioAxis = us-gaap_ParentCompanyMember

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