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(Details) - USD ($) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2019 | Jan. 29, 2019 | Aug. 01, 2018 | Aug. 31, 2018 | Jan. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 05, 2018
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire additional interest in subsidiaries |  |  |  |  |  |  |  | $ 241 | $ 0 |  |
Proceeds from sale of investments |  |  |  |  |  |  |  | 491 | 158 |  |
Gain on disposition of assets, net |  |  |  |  |  | $ 249 | $ 65 | $ 256 | 65 |  |
Icahn Enterprises Holdings |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  | 99.00% |  |  |
Payments to acquire additional interest in subsidiaries |  |  |  |  |  |  |  | $ 241 | 0 |  |
Proceeds from sale of investments |  |  |  |  |  |  |  | 491 | 158 |  |
Gain on disposition of assets, net |  |  |  |  |  | 249 | 65 | 256 | 65 |  |
Investment Funds |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of interest in subsidiary |  |  |  |  |  | 4,300 |  | $ 4,300 |  | $ 5,100 |
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% |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Affiliate ownership interest in Icahn Enterprises |  |  |  |  |  |  |  | 92.00% |  |  |
Energy Segment |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  | (3) | 0 | $ 5 | (5) |  |
Energy Segment | CVR Refining |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  | 3.90% |  |  |  |  |  |  |  |  |
Payments to acquire additional interest in subsidiaries |  | $ 241 |  |  |  |  |  |  |  |  |
Common units validly tendered and not properly withdrawn |  |  | 21,625,106 |  |  |  |  |  |  |  |
Energy Segment | CVR Energy |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  | 80.60% |  |  |  |  |  | 70.80% |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares |  |  | 13,699,549 |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance of Equity by Subsidiary to Noncontrolling Interests |  |  | $ 99 |  |  |  |  |  |  |  |
Railcar Segment |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  |  |  | 5 |  |
Railcar Segment | ARL |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of investments |  |  |  |  |  |  |  |  | 17 |  |
Gain on disposition of assets, net |  |  |  |  |  |  |  |  | 5 |  |
Food Packaging Segment |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  | 0 | 0 | $ 0 | $ 0 |  |
Food Packaging Segment | Viskase |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  | 78.60% | 74.60% |  |
Proceeds from subsidiary rights offering |  |  |  |  | $ 50 |  |  |  |  |  |
Contribution to subsidiary |  |  |  |  | $ 44 |  |  |  |  |  |
Real Estate Segment |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of investments |  |  |  | $ 139 |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  | $ 67 |  | 0 | 67 | $ 0 | $ 67 |  |
Mining Segment |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  | 252 | $ (2) | $ 252 | $ (2) |  |
Mining Segment | Ferrous Resources |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary | 77.20% |  |  |  |  |  |  |  |  |  |
Aggregate consideration for business to be disposed of |  |  |  |  |  |  |  |  |  |  | $ 550
Proceeds from sale of investments |  |  |  |  |  | 451 |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  | $ 252 |  |  |  |  |

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