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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Jan. 31, 2023
Loss Contingencies [Line Items] |  |  |  |
Environmental loss contingency accrual | $ 5 |  | $ 19 |
Minimum Carbon Dioxide Supply |  |  |  | $ 15
Maximum fee payable |  |  |  | $ 45
Starfire Holding Corporation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Ownership percentage by principal owner | 99.60% |  |  |
Pension funding indemnity agreement with subsidiary | $ 250 |  |  |
ACF |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Funded status of related party pension plan | $ 39 |  |  |
Icahn Enterprises Holdings | ACF | Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Ownership percentage by principal owner | 80.00% |  |  |
Mr. Icahn and affiliates | Minimum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Affiliate ownership interest | 80.00% |  |  |
Mr. Icahn and affiliates | Icahn Enterprises G.P. |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Affiliate ownership in parent company general partner | 100.00% |  |  |
Mr. Icahn and affiliates | Icahn Enterprises Holdings |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Affiliate ownership interest | 85.00% |  |  |
Energy |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Expense (benefit) | $ 51 | $ 11 |  |
RFS position | 294 |  | $ 329 |
Insurance policies coverage limits | $ 50 |  |  |

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