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Summary of Significant Accounting Policies Variable Interest Entities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Energy Segment | Cash and cash equivalents
Variable Interest Entity [Line Items]
Carrying amount of assets of VIE's	$ 370	$ 237
Energy Segment | Property, plant and equipment
Variable Interest Entity [Line Items]
Carrying amount of assets of VIE's	3,331	2,674
Energy Segment | Inventories
Variable Interest Entity [Line Items]
Carrying amount of assets of VIE's	349	290
Energy Segment | Goodwill
Variable Interest Entity [Line Items]
Carrying amount of assets of VIE's	0	574
Energy Segment | Intangible assets, net
Variable Interest Entity [Line Items]
Carrying amount of assets of VIE's	318	337
Energy Segment | Other assets
Variable Interest Entity [Line Items]
Carrying amount of assets of VIE's	85	115
Energy Segment | Accounts payable, accrued expenses and other liabilities
Variable Interest Entity [Line Items]
Carrying amount of liabilities of VIE's	534	333
Energy Segment | Debt
Variable Interest Entity [Line Items]
Carrying amount of liabilities of VIE's	$ 1,165	$ 667
Icahn Enterprises Holdings
Variable Interest Entity [Line Items]
Percentage of equity ownership in operating subsidiary	99.00%

X

- Definition

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611443-123010

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5710-111685

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5710-111685

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+ References

No definition available.

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