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(Details) - USD ($) $ in Millions |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 29, 2019 | Dec. 05, 2018 | Oct. 01, 2018 | Aug. 01, 2018 | Apr. 01, 2016 | Feb. 04, 2016 | Aug. 31, 2018 | Jan. 31, 2018 | Aug. 31, 2017 | Jan. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliate ownership interest |  |  |  |  |  |  |  |  |  |  |  | 98.01% |  |
Purchase of additional interests in consolidated subsidiaries |  |  |  |  |  |  |  |  |  |  |  | $ 5 | $ 349 | $ 2
Gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  |  | 84 | 2,163 | 6
Proceeds from disposition of businesses and assets |  |  |  |  |  |  |  |  |  |  |  | 3,370 | 1,983 | 31
Seller financing secured mortgages resulting from disposition of assets |  |  |  |  |  |  |  |  |  |  |  | 0 | 375 | 0
Energy Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  |  | (6) | (3) | 0
Automotive Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  |  | (1) | 5 | 1
Food Packaging Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Real Estate Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  | $ 89 |  | $ 456 |  |  | 89 | 496 | 1
Proceeds from disposition of businesses and assets |  |  |  |  |  |  | $ 179 |  | 225 |  |  |  |  |
Seller financing secured mortgages resulting from disposition of assets |  |  |  |  |  |  |  |  | 375 |  |  |  |  |
Total consideration received from sale of asset |  |  |  |  |  |  |  |  | 600 |  |  |  |  |
Real Estate Segment | First Mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller financing secured mortgages resulting from disposition of assets |  |  |  |  |  |  |  |  | 345 |  |  |  |  |
Real Estate Segment | Second Mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller financing secured mortgages resulting from disposition of assets |  |  |  |  |  |  |  |  | $ 30 |  |  |  |  |
Railcar Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  |  | $ 5 | 1,664 | 3
Icahn Enterprises Holdings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  |  |  |  | 99.00% |  |
Purchase of additional interests in consolidated subsidiaries |  |  |  |  |  |  |  |  |  |  |  | $ 5 | 349 | 2
Gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  |  | 84 | 2,163 | 6
Proceeds from disposition of businesses and assets |  |  |  |  |  |  |  |  |  |  |  | 3,370 | 1,983 | $ 31
Investment Funds |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment in subsidiary |  |  |  |  |  |  |  |  |  |  | $ 5,100 | $ 5,100 | 3,000 |
CVR Refining |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  |  |  |  | 3.90% |  |
Common units validly tendered and not properly withdrawn |  |  |  | 21,625,106 |  |  |  |  |  |  |  |  |  |
CVR Refining | Energy Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  |  |  |  | 80.60% |  |
CVR Nitrogen | Energy Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of subsidiary common units issued in a business combination |  |  |  |  | $ 335 |  |  |  |  |  |  |  |  |
Payments to acquire businesses |  |  |  |  | 99 |  |  |  |  |  |  |  |  |
Fair value of debt assumed in business combination |  |  |  |  | $ 368 |  |  |  |  |  |  |  |  |
CVR Partners | Energy Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  |  |  |  | 34.40% |  |
CVR Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  |  |  |  | 70.80% |  |
Equity issued to acquire additional interest in consolidated subsidiary (number of units) |  |  |  | 13,699,549 |  |  |  |  |  |  |  |  |  |
Change in equity as a result of acquisition of additional interest in consolidated subsidiary |  |  |  | $ 99 |  |  |  |  |  |  |  |  |  |
ADS and Precision Tune | Automotive Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses |  |  |  |  |  |  |  |  |  |  |  |  | $ 162 |
Pep Boys | Automotive Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration for acquisition of business |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |
Viskase | Food Packaging Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  |  |  |  | 78.60% | 74.60% |
Proceeds from rights offering |  |  |  |  |  |  |  | $ 50 |  |  |  |  |  |
Contribution to subsidiary |  |  |  |  |  |  |  | $ 44 |  |  |  |  |  |
ARL | Railcar Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  |  | $ 5 | $ 1,700 |
Proceeds from disposition of businesses and assets |  |  |  |  |  |  |  |  |  |  |  | $ 17 |  |
aggregate consideration for business disposed of |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800 |
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 |  |  |  |  |  |  |  |  |  |  |  |
Federal-Mogul |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  | 82.00%
Purchase of additional interests in consolidated subsidiaries |  |  |  |  |  |  |  |  |  | $ 305 |  |  |  |
Contribution to subsidiary |  |  |  |  |  |  |  |  |  |  |  | $ 56 |  |
Gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  | 251 |  |  |
Proceeds from disposition of businesses and assets |  |  | $ 800 |  |  |  |  |  |  |  |  |  |  |
consideration in shares for business disposed of |  |  | 29,500,000 |  |  |  |  |  |  |  |  |  |  |
consideration in non-voting shares for business disposed of |  |  | 23,800,000 |  |  |  |  |  |  |  |  |  |  |
consideration in voting shares for business disposed of |  |  | 5,700,000 |  |  |  |  |  |  |  |  |  |  |
investment, ownership percentage |  |  | 9.90% |  |  |  |  |  |  |  |  |  |  |
fair market value of shares obtained as consideration for business disposed of |  |  | $ 1,200 |  |  |  |  |  |  |  |  |  |  |
Tropicana |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  |  |  |  | 83.90% | 72.50% |
Purchase of additional interests in consolidated subsidiaries |  |  |  |  |  |  |  |  |  |  |  | $ 95 |  |
Gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  | 779 |  |  |
Proceeds from disposition of businesses and assets |  |  | 1,500 |  |  |  |  |  |  |  |  |  |  |
aggregate consideration for business disposed of |  |  | $ 1,800 |  |  |  |  |  |  |  |  |  |  |
Subsidiary repurchase of treasury stock |  |  |  |  |  |  |  |  |  |  |  | $ 36 |  |
ARI |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  | $ 400 |  |  |
Proceeds from disposition of businesses and assets |  | $ 831 |  |  |  |  |  |  |  |  |  |  |  |
Mr. Icahn and affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliate ownership interest |  |  |  |  |  |  |  |  |  |  |  | 91.70% |  |
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% |  |
Subsequent event | CVR Refining | Energy Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of additional interests in consolidated subsidiaries | $ 241 |  |  |  |  |  |  |  |  |  |  |  |  |

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