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Commitments and Contingencies Commitments and Contingencies (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Oct. 25, 2014 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Mr. Icahn and his affiliates [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Affiliate ownership interest |  | 89.10% |  |
ACF [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Defined benefit plan underfunded amount |  | $ 584 |  | $ 589
Starfire Holding Corporation [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Ownership percentage by Mr. Icahn |  | 99.40% |  |
Net worth floor for which distributions to stockholders would be limited while contingent liabilities exist that can be imposed on us |  | $ 250 |  |
Metals Segment [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Accrued environmental liabilities |  | 28 |  | 29
Railcar Segment [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Litigation claim gain amount | $ 25 |  |  |
Litigation counterclaim amount | $ 10 |  |  |
Automotive Segment [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Accrued environmental liabilities |  | 14 |  | 14
Possible material additional losses, above and beyond best estimate of required remediation costs |  | 43 |  |
Asset retirement obligation |  | 16 |  | 16
Energy Segment [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Rent expense on operating leases |  | 2 | $ 2 |
Accrued environmental liabilities |  | 4 |  | 4
Environmental remediation expense |  | 4 | 11 |
Cost of RINs |  | 43 | $ 37 |
Biofuel blending obligation |  | $ 24 |  | $ 10
Icahn Enterprises G.P. [Member] | Mr. Icahn and his affiliates [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Affiliate ownership in parent company general partner |  | 100.00% |  |

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