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Description of Business and Basis of Presentation (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Entity Information [Line Items] |  |
Debt | $ 12,969 | $ 12,594
Fair value of long-term debt | 12,600 | 12,200
Cash held at consolidated affiliated partnerships and restricted cash | 694 | 1,282
Restricted cash [Member] |  |
Entity Information [Line Items] |  |
Cash held at consolidated affiliated partnerships and restricted cash | $ 507 | 966
Icahn Enterprises G.P. [Member] |  |
Entity Information [Line Items] |  |
General partner ownership percentage in Icahn Enterprises | 1.00% |
General partner ownership interest in Icahn Enterprises Holdings | 1.00% |
Aggregate general partner ownership interest of parent and operating subsidiary | 1.99% |
Mr. Icahn and his affiliates [Member] |  |
Entity Information [Line Items] |  |
Affiliate ownership interest in Icahn Enterprises | 89.50% |
Icahn Enterprises Holdings [Member] |  |
Entity Information [Line Items] |  |
Percentage of equity ownership in operating subsidiary | 99.00% |
Debt | $ 12,969 | 12,594
Cash held at consolidated affiliated partnerships and restricted cash | 694 | 1,282
Debt [Member] |  |
Entity Information [Line Items] |  |
Affect on prior year financial statements from adopting new accounting principle |  | 39
Energy Segment [Member] |  |
Entity Information [Line Items] |  |
Debt | 1,168 | 667
Cash held at consolidated affiliated partnerships and restricted cash | 0 | 0
Energy Segment [Member] | Cash and Cash Equivalents [Member] |  |
Entity Information [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 236 | 237
Energy Segment [Member] | Property, Plant and Equipment [Member] |  |
Entity Information [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 3,408 | 2,674
Energy Segment [Member] | Inventories |  |
Entity Information [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 325 | 290
Energy Segment [Member] | Goodwill |  |
Entity Information [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 0 | 574
Energy Segment [Member] | Intangible assets, net |  |
Entity Information [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 328 | 337
Energy Segment [Member] | Other assets |  |
Entity Information [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Assets | 94 | 102
Energy Segment [Member] | Accounts payable, accrued expenses and other liabilities [Member] |  |
Entity Information [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities | 364 | 333
Energy Segment [Member] | Debt [Member] |  |
Entity Information [Line Items] |  |
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities | $ 1,167 | $ 667

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