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Segment Reporting - Condensed Balance Sheets (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Cash and cash equivalents | $ 2,468 | $ 2,951 |  |
Cash held at consolidated affiliated partnerships and restricted cash | 2,565 | 2,995 |  |
Investments | 3,315 | 3,012 |  |
Accounts receivable, net | 447 | 485 |  |
Inventories, net | 1,039 | 1,047 |  |
Related party notes receivable, net | 11 | 11 |  |
Property, plant and equipment, net | 3,940 | 3,969 |  |
Goodwill and intangible assets, net | 740 | 754 |  |
Other assets | 5,539 | 5,634 |  |
Total assets | 20,064 | 20,858 |  |
Accounts payable, accrued expenses and other liabilities | 4,187 | 4,105 |  |
Securities sold, not yet purchased, at fair value | 3,644 | 3,473 |  |
Debt | 6,608 | 7,207 |  |
Total liabilities | 14,439 | 14,785 |  |
Equity attributable to Icahn Enterprises | 2,781 | 3,208 |  |
Equity attributable to non-controlling interests | 2,844 | 2,865 |  |
Total equity | 5,625 | 6,073 | $ 8,496 | $ 9,558
Total Liabilities and Equity | 20,064 | 20,858 |  |
Investment Segment |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Cash and cash equivalents | 6 | 23 |  |
Cash held at consolidated affiliated partnerships and restricted cash | 2,379 | 2,799 |  |
Investments | 3,203 | 2,898 |  |
Other assets | 4,352 | 4,425 |  |
Total assets | 9,940 | 10,145 |  |
Accounts payable, accrued expenses and other liabilities | 999 | 1,312 |  |
Securities sold, not yet purchased, at fair value | 3,644 | 3,473 |  |
Total liabilities | 4,643 | 4,785 |  |
Equity attributable to Icahn Enterprises | 3,202 | 3,243 |  |
Equity attributable to non-controlling interests | 2,095 | 2,117 |  |
Total equity | 5,297 | 5,360 |  |
Total Liabilities and Equity | 9,940 | 10,145 |  |
Energy |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Cash and cash equivalents | 644 | 1,179 |  |
Cash held at consolidated affiliated partnerships and restricted cash |  | 7 |  |
Investments | 98 | 100 |  |
Accounts receivable, net | 253 | 286 |  |
Inventories, net | 601 | 604 |  |
Property, plant and equipment, net | 2,572 | 2,594 |  |
Goodwill and intangible assets, net | 174 | 179 |  |
Other assets | 287 | 310 |  |
Total assets | 4,629 | 5,259 |  |
Accounts payable, accrued expenses and other liabilities | 1,506 | 1,553 |  |
Debt | 1,585 | 2,185 |  |
Total liabilities | 3,091 | 3,738 |  |
Equity attributable to Icahn Enterprises | 811 | 795 |  |
Equity attributable to non-controlling interests | 727 | 726 |  |
Total equity | 1,538 | 1,521 |  |
Total Liabilities and Equity | 4,629 | 5,259 |  |
Automotive Segment |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Cash and cash equivalents | 64 | 104 |  |
Cash held at consolidated affiliated partnerships and restricted cash | 8 | 9 |  |
Accounts receivable, net | 41 | 41 |  |
Inventories, net | 213 | 228 |  |
Property, plant and equipment, net | 822 | 822 |  |
Goodwill and intangible assets, net | 333 | 335 |  |
Other assets | 477 | 480 |  |
Total assets | 1,958 | 2,019 |  |
Accounts payable, accrued expenses and other liabilities | 840 | 890 |  |
Debt | 29 | 33 |  |
Total liabilities | 869 | 923 |  |
Equity attributable to Icahn Enterprises | 1,089 | 1,096 |  |
Total equity | 1,089 | 1,096 |  |
Total Liabilities and Equity | 1,958 | 2,019 |  |
Food Packaging Segment |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Cash and cash equivalents | 7 | 8 |  |
Accounts receivable, net | 85 | 89 |  |
Inventories, net | 118 | 111 |  |
Property, plant and equipment, net | 129 | 134 |  |
Goodwill and intangible assets, net | 23 | 23 |  |
Other assets | 98 | 101 |  |
Total assets | 460 | 466 |  |
Accounts payable, accrued expenses and other liabilities | 136 | 148 |  |
Debt | 138 | 133 |  |
Total liabilities | 274 | 281 |  |
Equity attributable to Icahn Enterprises | 169 | 168 |  |
Equity attributable to non-controlling interests | 17 | 17 |  |
Total equity | 186 | 185 |  |
Total Liabilities and Equity | 460 | 466 |  |
Real Estate Segment |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Cash and cash equivalents | 33 | 22 |  |
Cash held at consolidated affiliated partnerships and restricted cash | 4 | 4 |  |
Investments | 14 | 14 |  |
Accounts receivable, net | 16 | 16 |  |
Property, plant and equipment, net | 363 | 363 |  |
Other assets | 71 | 69 |  |
Total assets | 501 | 488 |  |
Accounts payable, accrued expenses and other liabilities | 55 | 43 |  |
Debt | 1 | 1 |  |
Total liabilities | 56 | 44 |  |
Equity attributable to Icahn Enterprises | 440 | 439 |  |
Equity attributable to non-controlling interests | 5 | 5 |  |
Total equity | 445 | 444 |  |
Total Liabilities and Equity | 501 | 488 |  |
Home Fashion Segment |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Cash and cash equivalents | 4 | 5 |  |
Cash held at consolidated affiliated partnerships and restricted cash | 3 | 3 |  |
Accounts receivable, net | 22 | 26 |  |
Inventories, net | 85 | 81 |  |
Property, plant and equipment, net | 50 | 52 |  |
Goodwill and intangible assets, net | 19 | 19 |  |
Other assets | 20 | 17 |  |
Total assets | 203 | 203 |  |
Accounts payable, accrued expenses and other liabilities | 44 | 42 |  |
Debt | 8 | 8 |  |
Total liabilities | 52 | 50 |  |
Equity attributable to Icahn Enterprises | 151 | 153 |  |
Total equity | 151 | 153 |  |
Total Liabilities and Equity | 203 | 203 |  |
Pharma |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Cash and cash equivalents | 18 | 26 |  |
Accounts receivable, net | 30 | 27 |  |
Inventories, net | 22 | 23 |  |
Goodwill and intangible assets, net | 191 | 198 |  |
Other assets | 7 | 8 |  |
Total assets | 268 | 282 |  |
Accounts payable, accrued expenses and other liabilities | 54 | 55 |  |
Total liabilities | 54 | 55 |  |
Equity attributable to Icahn Enterprises | 214 | 227 |  |
Total equity | 214 | 227 |  |
Total Liabilities and Equity | 268 | 282 |  |
Holding Company |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Cash and cash equivalents | 1,692 | 1,584 |  |
Cash held at consolidated affiliated partnerships and restricted cash | 171 | 173 |  |
Related party notes receivable, net | 11 | 11 |  |
Property, plant and equipment, net | 4 | 4 |  |
Other assets | 227 | 224 |  |
Total assets | 2,105 | 1,996 |  |
Accounts payable, accrued expenses and other liabilities | 553 | 62 |  |
Debt | 4,847 | 4,847 |  |
Total liabilities | 5,400 | 4,909 |  |
Equity attributable to Icahn Enterprises | (3,295) | (2,913) |  |
Total equity | (3,295) | (2,913) |  |
Total Liabilities and Equity | $ 2,105 | $ 1,996 |  |

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