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Description of Business (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 07, 2021 | Dec. 31, 2021 USD ($) | Dec. 31, 2023 USD ($) product item | Dec. 31, 2022 USD ($)
Description of Business [Line Items] |  |  |  |
Aggregate general partner ownership interest of parent and operating subsidiary |  |  | 1.99% |
Disposal Group Not Discontinued Operation Gain Loss On Disposal Statement Of Income Extensible List Not Disclosed Flag |  | true |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | PSC Metals |  |  |  |
Description of Business [Line Items] |  |  |  |
Percentage of interest sold | 100.00% |  |  |
Proceeds from sale of equity interests |  | $ 163 |  |
Pretax gain on disposition of assets |  | $ 323 |  |
Icahn Enterprises Holdings |  |  |  |
Description of Business [Line Items] |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 99.00% |
Affiliate ownership interest |  |  | 99.00% |
Icahn Enterprises Holdings | Icahn Enterprises G.P. |  |  |  |
Description of Business [Line Items] |  |  |  |
General partner ownership percentage in Icahn Enterprises |  |  | 1.00% |
Icahn Enterprises Holdings | Mr. Icahn and affiliates |  |  |  |
Description of Business [Line Items] |  |  |  |
Affiliate ownership interest |  |  | 86.00% |
Icahn Enterprises G.P. |  |  |  |
Description of Business [Line Items] |  |  |  |
General partner ownership percentage in Icahn Enterprises |  |  | 1.00% |
Aggregate general partner ownership interest of parent and operating subsidiary |  |  | 1.99% |
Affiliate ownership interest |  |  | 98.01% |
CVR Refining |  |  |  |
Description of Business [Line Items] |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 37.00% |
CVR Energy | Energy |  |  |  |
Description of Business [Line Items] |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 66.00% |
Viskase | Private Placement |  |  |  |
Description of Business [Line Items] |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 90.00% |
Investment Funds |  |  |  |
Description of Business [Line Items] |  |  |  |
Fair value of investment in subsidiary |  |  | $ 3,200 | $ 4,200
CVR Partners | CVR Energy |  |  |  |
Description of Business [Line Items] |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 100.00% |
CVR Energy | Energy |  |  |  |
Description of Business [Line Items] |  |  |  |
Proceeds from partial sale of interests in consolidated subsidiaries |  |  | $ 158 |
Vivus | Pharma |  |  |  |
Description of Business [Line Items] |  |  |  |
Number of approved therapies | item |  |  | 2 |
Number of product candidates in active clinical development | product |  |  | 2 |

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