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Description of Business (Details) - USD ($) $ in Millions |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2019 | Jan. 29, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Description of Business [Line Items] |  |  |  |  |
Purchase of additional interests in consolidated subsidiaries |  |  | $ 0 | $ (241) |
Proceeds from sale of investments |  |  | $ 0 | 458 |
Icahn Enterprises Holdings |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 99.00% |  |
CVR Refining |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 35.00% |  |
Viskase |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 78.60% |  |
Icahn Enterprises Holdings |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |
Purchase of additional interests in consolidated subsidiaries |  |  | $ 0 | $ (241) |
Investment Funds |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |
Fair value of interest in subsidiary |  |  | $ 4,600 |  | $ 4,300
Icahn Enterprises G.P. |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |
Aggregate general partner ownership interest of parent and operating subsidiary |  |  | 1.99% |  |
Icahn Enterprises G.P. | Icahn Enterprises Holdings |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |
General partner ownership percentage in Icahn Enterprises |  |  | 1.00% |  |
Mr. Icahn and affiliates | Icahn Enterprises Holdings |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |
Affiliate ownership interest in Icahn Enterprises |  |  | 92.00% |  |
Energy Segment | CVR Refining |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  | 3.90% |  |  |
Energy Segment | CVR Energy |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  | 80.60% | 70.80% |  |
Energy Segment | CVR Refining |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |
Purchase of additional interests in consolidated subsidiaries |  | $ 241 |  |  |
Mining segment | Ferrous Resources |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |
Percentage of equity ownership in operating subsidiary | 77.20% |  |  |  |

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- Definition Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Aggregate Ownership interest of Parent and Holding Company Subsidiaries + References No definition available. + Details
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