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Segment Reporting - Condensed Balance Sheets (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 1,787 |  |  | $ 2,603 |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 2,238 |  |  | 2,636 |  |  |  |
Investments | 2,037 |  |  | 2,310 |  |  |  |
Accounts receivable, net | 418 |  |  | 479 |  |  |  |
Related party note receivable | 124 |  |  | 7 |  |  |  |
Inventories, net | 892 |  |  | 897 |  |  |  |
Property, plant and equipment, net | 3,742 |  |  | 3,843 |  |  |  |
Goodwill and intangible assets, net | 658 |  |  | 697 |  |  |  |
Other assets | 2,930 |  |  | 2,814 |  |  |  |
Total Assets | 14,826 |  |  | 16,279 |  |  |  |
Accounts payable, accrued expenses and other liabilities | 3,285 |  |  | 3,476 |  |  |  |
Securities sold, not yet purchased, at fair value | 1,434 |  |  | 1,373 |  |  |  |
Debt | 6,688 |  |  | 6,809 |  |  |  |
Total liabilities | 11,407 |  |  | 11,658 |  |  |  |
Equity attributable to Icahn Enterprises | 1,950 |  |  | 2,466 |  |  |  |
Equity attributable to non-controlling interests | 1,469 |  |  | 2,155 |  |  |  |
Total equity | 3,419 | $ 3,423 | $ 3,742 | 4,621 | $ 4,827 | $ 5,386 | $ 5,625 | $ 6,073
Total Liabilities and Equity | 14,826 |  |  | 16,279 |  |  |  |
Investment Segment |  |  |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents | 13 |  |  | 9 |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 2,050 |  |  | 2,449 |  |  |  |
Investments | 1,931 |  |  | 2,272 |  |  |  |
Other assets | 1,726 |  |  | 1,660 |  |  |  |
Total Assets | 5,720 |  |  | 6,390 |  |  |  |
Accounts payable, accrued expenses and other liabilities | 1,013 |  |  | 817 |  |  |  |
Securities sold, not yet purchased, at fair value | 1,434 |  |  | 1,373 |  |  |  |
Total liabilities | 2,447 |  |  | 2,190 |  |  |  |
Equity attributable to Icahn Enterprises | 2,449 |  |  | 2,703 |  |  |  |
Equity attributable to non-controlling interests | 824 |  |  | 1,497 |  |  |  |
Total equity | 3,273 |  |  | 4,200 |  |  |  |
Total Liabilities and Equity | 5,720 |  |  | 6,390 |  |  |  |
Energy |  |  |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents | 670 |  |  | 987 |  |  |  |
Investments | 18 |  |  | 24 |  |  |  |
Accounts receivable, net | 253 |  |  | 295 |  |  |  |
Inventories, net | 509 |  |  | 502 |  |  |  |
Property, plant and equipment, net | 2,401 |  |  | 2,504 |  |  |  |
Goodwill and intangible assets, net | 144 |  |  | 159 |  |  |  |
Other assets | 435 |  |  | 280 |  |  |  |
Total Assets | 4,430 |  |  | 4,751 |  |  |  |
Accounts payable, accrued expenses and other liabilities | 1,149 |  |  | 1,509 |  |  |  |
Debt | 1,841 |  |  | 1,919 |  |  |  |
Total liabilities | 2,990 |  |  | 3,428 |  |  |  |
Equity attributable to Icahn Enterprises | 807 |  |  | 685 |  |  |  |
Equity attributable to non-controlling interests | 633 |  |  | 638 |  |  |  |
Total equity | 1,440 |  |  | 1,323 |  |  |  |
Total Liabilities and Equity | 4,430 |  |  | 4,751 |  |  |  |
Automotive Segment |  |  |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents | 30 |  |  | 133 |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 8 |  |  | 8 |  |  |  |
Accounts receivable, net | 28 |  |  | 30 |  |  |  |
Inventories, net | 170 |  |  | 168 |  |  |  |
Property, plant and equipment, net | 815 |  |  | 808 |  |  |  |
Goodwill and intangible assets, net | 322 |  |  | 328 |  |  |  |
Other assets | 432 |  |  | 464 |  |  |  |
Total Assets | 1,805 |  |  | 1,939 |  |  |  |
Accounts payable, accrued expenses and other liabilities | 772 |  |  | 809 |  |  |  |
Debt | 22 |  |  | 31 |  |  |  |
Total liabilities | 794 |  |  | 840 |  |  |  |
Equity attributable to Icahn Enterprises | 1,011 |  |  | 1,099 |  |  |  |
Total equity | 1,011 |  |  | 1,099 |  |  |  |
Total Liabilities and Equity | 1,805 |  |  | 1,939 |  |  |  |
Food Packaging Segment |  |  |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents | 7 |  |  | 6 |  |  |  |
Accounts receivable, net | 68 |  |  | 75 |  |  |  |
Inventories, net | 92 |  |  | 109 |  |  |  |
Property, plant and equipment, net | 133 |  |  | 124 |  |  |  |
Goodwill and intangible assets, net | 21 |  |  | 21 |  |  |  |
Other assets | 83 |  |  | 90 |  |  |  |
Total Assets | 404 |  |  | 425 |  |  |  |
Accounts payable, accrued expenses and other liabilities | 110 |  |  | 107 |  |  |  |
Debt | 140 |  |  | 144 |  |  |  |
Total liabilities | 250 |  |  | 251 |  |  |  |
Equity attributable to Icahn Enterprises | 142 |  |  | 159 |  |  |  |
Equity attributable to non-controlling interests | 12 |  |  | 15 |  |  |  |
Total equity | 154 |  |  | 174 |  |  |  |
Total Liabilities and Equity | 404 |  |  | 425 |  |  |  |
Real Estate Segment |  |  |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents | 31 |  |  | 25 |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash |  |  |  | 2 |  |  |  |
Investments | 88 |  |  | 14 |  |  |  |
Accounts receivable, net | 14 |  |  | 14 |  |  |  |
Related party note receivable | 124 |  |  |  |  |  |  |
Property, plant and equipment, net | 334 |  |  | 350 |  |  |  |
Other assets | 69 |  |  | 90 |  |  |  |
Total Assets | 660 |  |  | 495 |  |  |  |
Accounts payable, accrued expenses and other liabilities | 26 |  |  | 42 |  |  |  |
Debt | 1 |  |  | 1 |  |  |  |
Total liabilities | 27 |  |  | 43 |  |  |  |
Equity attributable to Icahn Enterprises | 633 |  |  | 447 |  |  |  |
Equity attributable to non-controlling interests |  |  |  | 5 |  |  |  |
Total equity | 633 |  |  | 452 |  |  |  |
Total Liabilities and Equity | 660 |  |  | 495 |  |  |  |
Home Fashion Segment |  |  |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents | 2 |  |  | 4 |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 3 |  |  | 4 |  |  |  |
Accounts receivable, net | 23 |  |  | 28 |  |  |  |
Inventories, net | 96 |  |  | 93 |  |  |  |
Property, plant and equipment, net | 56 |  |  | 53 |  |  |  |
Goodwill and intangible assets, net | 22 |  |  | 19 |  |  |  |
Other assets | 12 |  |  | 19 |  |  |  |
Total Assets | 214 |  |  | 220 |  |  |  |
Accounts payable, accrued expenses and other liabilities | 34 |  |  | 43 |  |  |  |
Debt | 21 |  |  | 15 |  |  |  |
Total liabilities | 55 |  |  | 58 |  |  |  |
Equity attributable to Icahn Enterprises | 159 |  |  | 162 |  |  |  |
Total equity | 159 |  |  | 162 |  |  |  |
Total Liabilities and Equity | 214 |  |  | 220 |  |  |  |
Pharma |  |  |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents | 36 |  |  | 42 |  |  |  |
Accounts receivable, net | 32 |  |  | 37 |  |  |  |
Inventories, net | 25 |  |  | 25 |  |  |  |
Goodwill and intangible assets, net | 149 |  |  | 170 |  |  |  |
Other assets | 6 |  |  | 7 |  |  |  |
Total Assets | 248 |  |  | 281 |  |  |  |
Accounts payable, accrued expenses and other liabilities | 65 |  |  | 72 |  |  |  |
Total liabilities | 65 |  |  | 72 |  |  |  |
Equity attributable to Icahn Enterprises | 183 |  |  | 209 |  |  |  |
Total equity | 183 |  |  | 209 |  |  |  |
Total Liabilities and Equity | 248 |  |  | 281 |  |  |  |
Holding Company |  |  |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Cash and cash equivalents | 998 |  |  | 1,397 |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 177 |  |  | 173 |  |  |  |
Property, plant and equipment, net | 3 |  |  | 4 |  |  |  |
Other assets | 167 |  |  | 204 |  |  |  |
Total Assets | 1,345 |  |  | 1,778 |  |  |  |
Accounts payable, accrued expenses and other liabilities | 116 |  |  | 77 |  |  |  |
Debt | 4,663 |  |  | 4,699 |  |  |  |
Total liabilities | 4,779 |  |  | 4,776 |  |  |  |
Equity attributable to Icahn Enterprises | (3,434) |  |  | (2,998) |  |  |  |
Total equity | (3,434) |  |  | (2,998) |  |  |  |
Total Liabilities and Equity | $ 1,345 |  |  | $ 1,778 |  |  |  |

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