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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Feb. 29, 2024 | Mar. 31, 2023 | Dec. 31, 2022
Accounting Policies [Line Items] |  |  |  |  |
Total assets | $ 20,064 | $ 20,858 |  |  |
Debt | 6,608 | 7,207 |  |  |
Fair value of long-term debt | 6,400 | 6,900 |  |  |
Cash and cash equivalents | 2,468 | 2,951 |  |  |
Restricted cash | 2,565 | 2,995 |  |  |
Accumulated other comprehensive loss | $ (57) | (55) |  | $ (66) | $ (70)
Icahn Enterprises G.P. |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Aggregate general partner ownership interest of parent and operating subsidiary | 1.99% |  |  |  |
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 | $ 791 | 1,068 |  |  |
Restricted cash |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Restricted cash | 1,774 | 1,927 |  |  |
Primary beneficiary |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Total assets | 104 |  |  |  |
Energy |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Total assets | 4,629 | 5,259 |  |  |
Debt | 1,585 | 2,185 |  |  |
Cash and cash equivalents | 644 | 1,179 |  |  |
Restricted cash |  | 7 |  |  |
Remaining performance obligation expected to be recognized as revenue within one year | 14 |  |  |  |
Remaining performance obligation expected to be recognized as revenue within one year | 4 |  |  |  |
Remaining performance obligation for contracts with an original expected duration of more than one year | 5 |  |  |  |
Deferred revenue | 52 | 49 |  |  |
Recorded revenue | $ 5 | $ 12 |  |  |
Lease term | 5 years 3 months 18 days | 5 years 4 months 24 days |  |  |
Energy | 5.25% senior unsecured notes due 2025 |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Interest rate on debt instrument |  |  | 5.25% |  |
Automotive Segment |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Total assets | $ 1,958 | $ 2,019 |  |  |
Debt | 29 | 33 |  |  |
Cash and cash equivalents | 64 | 104 |  |  |
Restricted cash | 8 | 9 |  |  |
Deferred revenue | 43 | 45 |  |  |
Recorded revenue | $ 6 | $ 6 |  |  |
Lease term | 5 years 3 months 18 days | 5 years 4 months 24 days |  |  |
Real Estate Segment |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Total assets | $ 501 | $ 488 |  |  |
Debt | 1 | 1 |  |  |
Cash and cash equivalents | 33 | 22 |  |  |
Restricted cash | $ 4 | $ 4 |  |  |

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