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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Jan. 31, 2023
Loss Contingencies [Line Items] |  |  |  |  |  |
Environmental loss contingency accrual | $ 5 |  | $ 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% |  | 99.60% |  |  |
Pension funding indemnity agreement with subsidiary | $ 250 |  | $ 250 |  |  |
ACF |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Funded status of related party pension plan | $ 26 |  | $ 26 |  |  |
Icahn Enterprises Holdings | ACF | Minimum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Ownership percentage by principal owner | 80.00% |  | 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) | $ 30 | $ 48 | $ 21 | $ 37 |  |
RFS position | $ 312 |  | 312 |  | $ 329 |
Insurance policies coverage limits |  |  | $ 50 |  |  |

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