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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Feb. 29, 2024
Accounting Policies [Line Items] |  |  |  |  |
Total Assets | $ 20,858 | $ 16,279 | $ 20,858 |  |
Assets held for sale |  | 25 |  |  |
Debt | 7,207 | 6,809 | 7,207 |  |
Fair value of long-term debt | 6,900 | 6,600 | 6,900 |  |
Restricted cash | 2,995 | 2,636 | 2,995 |  |
Portion of inventory under LIFO method | 228 | 168 | 228 |  |
Post-retirement benefit liability | 34 | 25 | 34 |  |
Accumulated other comprehensive loss | 55 | 61 | 55 |  |
Impairment |  |  | 7 |  |
Cash and cash equivalents | 2,951 | $ 2,603 | 2,951 |  |
Aggregate general partner ownership interest of parent and operating subsidiary |  | 1.99% |  |  |
Discontinued Operations, Held-for-Sale |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Assets held for sale |  | $ 25 |  |  |
Icahn Enterprises G.P. |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Aggregate general partner ownership interest of parent and operating subsidiary |  | 1.99% |  |  |
Affiliate ownership interest |  | 98.01% |  |  |
Icahn Enterprises Holdings |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  | 99.00% |  |  |
Affiliate ownership interest |  | 99.00% |  |  |
Cash held at consolidated affiliated partnerships |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Restricted cash | 1,100 | $ 900 | 1,100 |  |
Restricted cash |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Restricted cash | 1,900 | 1,700 | 1,900 |  |
Primary beneficiary |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Total Assets |  | 108 |  |  |
Energy |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Total Assets | 5,259 | 4,751 | 5,259 |  |
Debt | 2,185 | 1,919 | 2,185 |  |
Restricted cash | 7 |  | 7 |  |
Deferred revenue | $ 49 | 78 | 49 |  |
Recorded revenue |  | 16 | $ 46 | $ 86 |
Remaining performance obligation expected to be recognized as revenue within one year |  | $ 8 |  |  |
Useful lives of the assets | 5 years 4 months 24 days | 5 years 4 months 24 days | 5 years 4 months 24 days |  |
Cash and cash equivalents | $ 1,179 | $ 987 | $ 1,179 |  |
Energy | 5.25% senior unsecured notes due 2025 |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Interest rate on debt instrument (in percent) | 5.25% |  | 5.25% |  | 5.25%
Energy | Reserved Funds |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 598 |  | $ 598 |  |
Energy | Minimum | Refineries |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Turnaround Term of Plants |  | 4 years |  |  |
Energy | Maximum | Refineries |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Turnaround Term of Plants |  | 5 years |  |  |
Energy | Maximum | Nitrogen Fertilizer Plants |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Turnaround Term of Plants |  | 3 years |  |  |
Automotive Segment |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Total Assets | 2,019 | $ 1,939 | 2,019 |  |
Debt | 33 | 31 | 33 |  |
Restricted cash | 9 | 8 | 9 |  |
Deferred revenue | 45 | 37 | 45 |  |
Recorded revenue |  | $ 22 | $ 22 | $ 25 |
Impairment | $ 7 |  |  |  |
Useful lives of the assets | 5 years 4 months 24 days | 5 years 4 months 24 days | 5 years 4 months 24 days |  |
Cash and cash equivalents | $ 104 | $ 133 | $ 104 |  |
Real Estate and Automotive | Minimum |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Useful lives of the assets |  | 5 years |  |  |
Real Estate and Automotive | Maximum |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Useful lives of the assets |  | 39 years |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Remaining performance obligation for contracts with an original expected duration of more than one year |  | 1 year |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 | Energy |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Remaining performance obligation expected to be recognized as revenue within one year |  | $ 4 |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Remaining performance obligation for contracts with an original expected duration of more than one year |  | 1 year |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01 | Energy |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Remaining performance obligation for contracts with an original expected duration of more than one year |  | $ 3 |  |  |

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