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Investments and Related Matters Other Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Investments	$ 14,869us-gaap_Investments	$ 14,500us-gaap_Investments
Other Segments [Member]
Schedule of Investments [Line Items]
Equity method investments	287us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsMember	298us-gaap_EquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsMember
Other investments	189us-gaap_OtherInvestments / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsMember	241us-gaap_OtherInvestments / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsMember
Investments	476us-gaap_Investments / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsMember	539us-gaap_Investments / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsMember
Energy Segment [Member]
Schedule of Investments [Line Items]
Proceeds from Sale of Available-for-sale Securities	42us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Investments	38us-gaap_Investments / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember	77us-gaap_Investments / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Proceeds from sale of available for sale securities not yet received	26iep_Proceedsfromsaleofavailableforsalesecuritiesnotyetreceived / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Cost basis of available for sale securities sold during the period	48iep_Costbasisofavailableforsalesecuritiessoldduringtheperiod / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Reclassification adjustment from AOCI for sale of securities, before tax	20us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Cost basis of available for sale securities transferred to trading securities	26iep_Costbasisofavailableforsalesecuritiestransferredtotradingsecurities / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Available-for-sale Securities, Transfers to Trading, Gains (Losses)	$ 12us-gaap_AvailableForSaleSecuritiesTransfersToTradingGainsLossesNet / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember

X

- Definition

Cost basis of available for sale securities sold during the period

+ References

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- Definition

Cost basis of available for sale securities transferred to trading securities

+ References

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- Definition

Proceeds from sale of available for sale securities not yet received

+ References

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- Definition

This item represents the difference between the gross amount of gains (losses) included in earnings for transfers of securities from the available-for-sale category into the trading category. Such net gain (loss) included in earnings represents the net unrealized gain (loss) which had been included in other comprehensive income and is associated with the securities transferred from the available-for-sale category to the trading category.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (d)

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X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

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- Definition

Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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- Definition

Other investments not otherwise specified in the taxonomy.

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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-Glossary Investing Activities

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