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Schedule I - Condensed Financial Information of Parent (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |
Aggregate general partner ownership interest of parent and operating subsidiary | 1.99% |  |
Debt | $ 8,059 | $ 8,192 |
Icahn Enterprises Holdings |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
General partner ownership percentage in Icahn Enterprises | 1.00% |  |
Affiliate ownership interest | 99.00% |  |
Aggregate general partner ownership interest of parent and operating subsidiary | 1.00% |  |
Icahn Enterprises Holdings (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net advances from subsidiaries | $ 1,093 | 567 | $ 238
Debt | 5,813 | 6,300 |
Icahn Enterprises (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net investment in and advances from subsidiaries | 1,276 | (363) | $ 433
Debt | $ 5,811 | 6,297 |
5.875% senior unsecured notes due 2022 | Icahn Enterprises Holdings (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt |  | $ 1,345 |
Interest rate on debt instrument | 5.875% | 5.875% |
5.875% senior unsecured notes due 2022 | Icahn Enterprises (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt |  | $ 1,345 |
Interest rate on debt instrument | 5.875% | 5.875% |
6.250% senior unsecured notes due 2022 | Icahn Enterprises Holdings (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt | $ 1,208 | $ 1,211 |
Interest rate on debt instrument | 6.25% | 6.25% |
6.250% senior unsecured notes due 2022 | Icahn Enterprises (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt | $ 1,209 | $ 1,211 |
Interest rate on debt instrument | 6.25% | 6.25% |
6.750% senior unsecured notes due 2024 | Icahn Enterprises Holdings (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt | $ 500 | $ 499 |
Interest rate on debt instrument | 6.75% | 6.75% |
6.750% senior unsecured notes due 2024 | Icahn Enterprises (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt | $ 499 | $ 498 |
Interest rate on debt instrument | 6.75% | 6.75% |
4.750% senior unsecured notes due 2024 | Icahn Enterprises Holdings (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt | $ 1,107 | $ 499 |
Interest rate on debt instrument | 4.75% | 4.75% |
4.750% senior unsecured notes due 2024 | Icahn Enterprises (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt | $ 1,106 | $ 498 |
Interest rate on debt instrument | 4.75% | 4.75% |
6.375% senior unsecured notes due 2025 | Icahn Enterprises Holdings (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt | $ 749 | $ 749 |
Interest rate on debt instrument | 6.375% | 6.375% |
6.375% senior unsecured notes due 2025 | Icahn Enterprises (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt | $ 748 | $ 748 |
Interest rate on debt instrument | 6.375% | 6.375% |
6.250% senior unsecured notes due 2026 | Icahn Enterprises Holdings (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt | $ 1,250 | $ 1,250 |
Interest rate on debt instrument | 6.25% | 6.25% |
6.250% senior unsecured notes due 2026 | Icahn Enterprises (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt | $ 1,250 | $ 1,250 |
Interest rate on debt instrument | 6.25% | 6.25% |
5.250% senior unsecured notes due 2027 | Icahn Enterprises Holdings (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt | $ 999 | $ 747 |
Interest rate on debt instrument | 5.25% | 5.25% |
5.250% senior unsecured notes due 2027 | Icahn Enterprises (Parent) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Debt | $ 999 | $ 747 |
Interest rate on debt instrument | 5.25% | 5.25% |

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