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Commitments and Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Loss Contingencies [Line Items] |  |  |  |  |
Defined benefit plan underfunded amount | $ 435 |  | $ 435 |  | $ 424
Mr. Icahn and affiliates |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Affiliate ownership interest |  |  | 91.30% |  |
Starfire Holding Corporation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Ownership percentage by Mr. Icahn | 99.40% |  | 99.40% |  |
Pension funding indemnity agreement with subsidiary | $ 250 |  | $ 250 |  |
Energy Segment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
RINs costs | 50 | $ 106 | 27 | $ 99 |
Biofuel blending obligation | 16 |  | 16 |  | 28
RINs asset | 14 |  | 14 |  |
Railcar Segment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Railcar loss contingency accrual | 9 |  | $ 9 |  |
Icahn Enterprises G.P. | Mr. Icahn and affiliates |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Affiliate ownership in parent company general partner |  |  | 100.00% |  |
Accrued expenses and other liabilities |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental liabilities | 38 |  | $ 38 |  | $ 34
Liabilities held for sale [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental liabilities | $ 15 |  | $ 15 |  |

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