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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Accounting Policies [Line Items] |  |  |  |  |
Total Assets | $ 14,826 | $ 14,826 | $ 14,826 |  | $ 16,279
Debt | 6,688 | 6,688 | 6,688 |  | 6,809
Fair value of long-term debt | 6,600 | 6,600 | 6,600 |  | 6,600
Restricted cash | 2,238 | 2,238 | $ 2,238 |  | 2,636
TEB LLC [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Carrying Value Equity Method Investment | 74 |  |  |  |
Carrying Value Of Equity Investment And Related Party Loan Receivable | 198 |  |  |  |
Icahn Enterprises Holdings |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 99.00% |  |
Cash held at consolidated affiliated partnerships |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Restricted cash | 471 | 471 | $ 471 |  | 915
Restricted cash |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Restricted cash | 1,800 | 1,800 | 1,800 |  | 1,700
Primary beneficiary |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Total Assets | 112 | 112 | 112 |  | 108
Energy |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Total Assets | 4,430 | 4,430 | 4,430 |  | 4,751
Debt | 1,841 | 1,841 | 1,841 |  | 1,919
Remaining performance obligation expected to be recognized as revenue within one year | 5 | 5 | 5 |  |
Deferred revenue | 58 | 58 | 58 |  | 78
Recorded revenue |  |  | 49 | $ 14 |
Carrying value of property, plant and equipment |  |  | 93 |  |
Energy | Service life |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Depreciation related to property, plant and equipment |  | 31 |  |  |
Automotive Segment |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Total Assets | 1,805 | 1,805 | 1,805 |  | 1,939
Debt | 22 | 22 | 22 |  | 31
Restricted cash | 8 | 8 | 8 |  | 8
Deferred revenue | $ 29 | $ 29 | 29 |  | $ 37
Recorded revenue |  |  | $ 17 | $ 17 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Remaining performance obligation for contracts with an original expected duration of more than one year | 3 months | 3 months | 3 months |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 | Energy |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Remaining performance obligation expected to be recognized as revenue within one year | $ 2 | $ 2 | $ 2 |  |
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 | 1 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 | $ 3 | $ 3 |  |

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