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Investments and Related Matters Investment Segment (Details) (Investment Segment [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of equity method investment under fair value option	$ 1iep_FairValueOfEquityMethodInvestmentUnderFairValueOption	$ 1iep_FairValueOfEquityMethodInvestmentUnderFairValueOption
Portion of trading (losses) gains that relates to trading securities still held at balance sheet date	(570)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss	2,900us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss	697us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
Equity Method Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value option, recorded gains (losses)	$ 1us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember	$ 140us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember	$ 310us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember

X

- Definition

Fair Value of Equity Method Investment Under Fair Value Option

+ References

No definition available.

+ Details

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X

- Definition

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 30

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

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- Definition

Amount of unrealized holding gain (loss) recognized in the income statement for investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7(c))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

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