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Commitments and Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental liabilities | $ 49 |  | $ 49 |  | $ 50
Defined benefit plan underfunded amount | $ 452 |  | $ 452 |  | 613
Mr. Icahn and affiliates |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Affiliate ownership interest |  |  | 90.80% |  |
Starfire Holding Corporation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Ownership percentage by Mr. Icahn | 99.40% |  | 99.40% |  |
Pension funding indemnity agreement with subsidiary | $ 250 |  | $ 250 |  |
Automotive Segment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental liabilities | 15 |  | 15 |  | 16
Possible material additional losses, above and beyond best estimate of required remediation costs |  |  | 40 |  |
Energy Segment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental liabilities | 4 |  | 4 |  | 5
Environmental remediation expense | 5 | $ 7 | 12 | $ 13 |
RINs costs | 64 | $ 58 | 164 | $ 152 |
Biofuel blending obligation | 185 |  | 185 |  | 186
Uncommitted biofuel blending obligation recognized at fair value | 127 |  | 127 |  | 186
Railcar Segment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Railcar loss contingency accrual | 13 |  | 13 |  |
Metals Segment |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental liabilities | $ 28 |  | $ 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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