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Basis of Presentation and Summary of Significant Accounting Policies Variable Interest Entities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Icahn Enterprises Holdings |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Percentage of equity ownership in operating subsidiary | 99.00% |
Icahn Enterprises Holdings | Cash and cash equivalents |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Assets of VIE's | $ 415 | $ 223
Icahn Enterprises Holdings | Cash held at consolidated affiliated partnerships and restricted cash |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Assets of VIE's | 2,648 | 734
Icahn Enterprises Holdings | Investments |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Assets of VIE's | 6,951 | 9,615
Icahn Enterprises Holdings | Due from brokers |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Assets of VIE's | 664 | 506
Icahn Enterprises Holdings | Property, plant and equipment |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Assets of VIE's | 3,027 | 3,185
Icahn Enterprises Holdings | Inventories |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Assets of VIE's | 380 | 369
Icahn Enterprises Holdings | Intangible assets, net |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Assets of VIE's | 278 | 298
Icahn Enterprises Holdings | Other assets |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Assets of VIE's | 863 | 267
Icahn Enterprises Holdings | Accounts payable, accrued expenses and other liabilities |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Liabilities of VIE's | 516 | 1,815
Icahn Enterprises Holdings | Securities Sold, Not yet Purchased |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Liabilities of VIE's | 468 | 1,023
Icahn Enterprises Holdings | Due to brokers |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Liabilities of VIE's | 141 | 1,057
Icahn Enterprises Holdings | Debt |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Liabilities of VIE's | $ 1,170 | $ 1,166
Viskase |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |
Subsidiary ownership interest in variable interest entity | 50.00% |

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