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Commitments and Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Loss Contingencies [Line Items] |  |  |
Accrued environmental liabilities | $ 49 |  | $ 50
Defined benefit plan underfunded amount | $ 417 |  | 424
Mr. Icahn and affiliates |  |  |
Loss Contingencies [Line Items] |  |  |
Affiliate ownership interest | 91.00% |  |
Starfire Holding Corporation |  |  |
Loss Contingencies [Line Items] |  |  |
Ownership percentage by Mr. Icahn | 99.40% |  |
Pension funding indemnity agreement with subsidiary | $ 250 |  |
Automotive Segment |  |  |
Loss Contingencies [Line Items] |  |  |
Accrued environmental liabilities | 15 |  | 16
Possible material additional losses, above and beyond best estimate of required remediation costs | 24 |  |
Energy Segment |  |  |
Loss Contingencies [Line Items] |  |  |
Accrued environmental liabilities | 4 |  | 4
Environmental remediation expense | 5 | $ 5 |
RINs costs | (23) | $ (6) |
Biofuel blending obligation | 21 |  | 28
RINs asset | 60 |  |
Railcar Segment |  |  |
Loss Contingencies [Line Items] |  |  |
Railcar loss contingency accrual | 9 |  |
Metals Segment |  |  |
Loss Contingencies [Line Items] |  |  |
Accrued environmental liabilities | $ 28 |  | $ 28
Icahn Enterprises G.P. | Mr. Icahn and affiliates |  |  |
Loss Contingencies [Line Items] |  |  |
Affiliate ownership in parent company general partner | 100.00% |  |

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