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Investments and Related Matters Investment Segment (Details) (Investment Segment [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of equity method investment under fair value option | $ 1 us-gaap_EquityMethodInvestmentsFairValueDisclosure |  | $ 1 us-gaap_EquityMethodInvestmentsFairValueDisclosure
Portion of trading gains that relates to trading securities still held | 509 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss | 162 us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss |
Equity method investments [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value option, recorded gains (losses) | $ (1)us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | $ 1 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_InvestmentTypeAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |

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- Definition Fair value portion of investments accounted under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35740979&loc=d3e32014-111567 + Details
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- 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 + Details
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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 + Details
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